CN104991142B

CN104991142B - A kind of signal analyzer, device and processing method

Info

Publication number: CN104991142B
Application number: CN201510405839.8A
Authority: CN
Inventors: 贺惠农; 陈斌; 赵玉刚
Original assignee: HANGZHOU VICON TECHNOLOGY Co Ltd
Current assignee: HANGZHOU VICON TECHNOLOGY Co Ltd
Priority date: 2015-07-09
Filing date: 2015-07-09
Publication date: 2018-12-07
Anticipated expiration: 2035-07-09
Also published as: CN104991142A

Abstract

The invention belongs to the testing fields of electrical property, more particularly to a kind of signal analyzer, device and processing method, digital signal processing unit, analogy signal processing unit, central processing unit, the digital signal processing unit, for when digital signal inputs, determine the respective thresholds of the digital signal of input, and level signal needed for according to determining respective thresholds the digital signal level of input being converted to central processing unit, the analogy signal processing unit, for when analog signal inputs, analogy signal processing unit manually select input analog signal corresponding coupled modes after the analog signal of input is enlarged into analog-to-digital conversion according to determining corresponding coupled modes needed for voltage, the present invention has measurement accuracy high, sampling rate is high, arithmetic speed is high, the strong beneficial effect of signal analysis ability.

Description

A kind of signal analyzer, device and processing method

Technical field

The invention belongs to the testing field of electrical property more particularly to a kind of signal analyzers, device and processing method.

Background technique

Sensor is a kind of induction measurand, and converts thereof into the detection device of electric signal, and there are many sensor, Divide according to purposes, acceleration transducer, displacement sensor, velocity sensor, speed probe and pressure sensing can be divided into Device etc., sensor output signal is also varied, and the type of output signal has analog signal and digital signal, and output amplitude also has There is small sensor greatly in use, needing to be equipped with corresponding sensor signal conditioning module, in actual control system, needs not of the same race The sensor of class, if every 1 sensor is all equipped with 1 signal conditioning module, this will increase the complexity of system, therefore, greatly The signal acquisition of type control system generally uses concentrated collection, its Usage data collection is acquired with analyzer and analyte sensors Signal.

Some data collection and analysis instrument can be acquired and analyze to analog signal at present, can satisfy a part of biography The demand of sensor signal conditioning, but signal measurement and analysis performance are general, and cannot be digital signal to output signal Sensor carries out duty ratio, cycle length, frequency and accurately measures and analyze, in addition, most digital signal measurement in the market Device measures the revolving speed of digital signal by single-chip microcontroller, and measurement accuracy is not high, and cannot carry out real-time online point to signal Analysis.

Summary of the invention

The present invention provides a kind of signal analyzer, device and processing method, to solve survey mentioned above in the background art Accuracy of measurement is not high, and cannot to signal carry out on-line analysis the problems such as.

Technical problem solved by the invention is realized using following technical scheme:

A kind of signal analyzer, which is characterized in that the analyzer includes digital signal processing unit, analog signal processing Unit, central processing unit, the digital signal processing unit, in digital signal input, determining the number letter of input Number respective thresholds, and electricity needed for the digital signal level of input is converted to central processing unit according to determining respective thresholds It is flat, the analogy signal processing unit, in analog signal input, analogy signal processing unit manually to select input The analog signal of input modulus is enlarged into according to determining corresponding coupled modes after the corresponding coupled modes of analog signal to turn Required voltage is changed, the central processing unit receives at through digital signal processing unit for controlling digital signal processing unit The digital signal of reason, and digital signal operation and processing to the input, the operation and processing include duty ratio, week The measurement of phase, frequency, or for controlling analogy signal processing unit, and receive through analog-to-digital conversion in analogy signal processing unit Analog signal data, and analog signal data operation and processing to the input, the operation and processing include voltage Measurement, digital signal processing unit input are connected with sensor signal data output, digital signal processing unit export and The input of central processing unit first is connected, and the analogy signal processing unit input is connected with sensor analog signals output, mould Quasi- signal processing unit output is connected with the input of central processing unit second；

Further, the digital signal processing unit includes Auto-matching module, for identification different amplitude digital signals Threshold values, and the digital signal of input is converted into Transistor-Transistor Logic level comprising the first protection circuit, the first filter circuit, signal are whole Shape circuit and D/A converting circuit, the first protection circuit are used to carry out overvoltage protection and electrostatic protection, institute to input signal The first filter circuit is stated for the High-frequency Interference in filtered input signal, the signal transformation circuit for comparator input signal with The Transistor-Transistor Logic level of threshold voltage and outputting standard, the D/A converting circuit generate threshold voltage, the level switch module, packet Level shifting circuit is included, is converted into identification signal for TTL signal, the identification signal is the received letter of central processing unit institute Number, the signal transformation circuit includes digital regulation resistance, and model MAX5439, the MAX5439 are used for 128 taps Different threshold voltages are generated, signal transformation circuit includes operational amplifier, and the operational amplifier is OPA140, for exporting TTL signal, level shifting circuit include SN74LVC164245, are converted to identification signal, the identification signal for TTL signal For 0~3.3V signal；

The analogy signal processing unit includes signal conditioning module, for acquiring and improving analog signal, is output to mould Number conversion module comprising the second protection circuit, the second filter circuit, coupled modes selection circuit and gain adjusting circuit, institute The second protection circuit is stated for carrying out overvoltage protection and electrostatic protection to input signal, filter circuit is in filtered input signal High-frequency Interference, coupled modes selection circuit be used for through central processing unit selection signal coupled modes, the coupled modes packet Include differential DC coupled modes, difference AC-coupled mode, single-end DC coupled modes, single-ended AC coupled mode and ICP coupling Conjunction mode, gain adjusting circuit is for amplifying input signal through central processing unit, analog-to-digital conversion module, including anti-aliasing filter Wave circuit and analog to digital conversion circuit, the Anti-aliasing Filter Circuits are used to carry out anti-aliasing filter processing, analog-to-digital conversion to signal For circuit for converting analog signals into digital signal, the gain adjusting circuit includes high-accuracy low consumed power operational amplifier, The high-accuracy low consumed power operational amplifier is AD8682, and analog-digital conversion circuit as described includes ADC chip, described to ADC chip Through central processing unit programming Control, the ADC chip is high-precision low-power consumption A/D chip, the high-precision low-power consumption A/D chip There are 24 data bits for CS5361, the CS5361, high s/n ratio reaches as high as the sample rate of 204.8ksps；

The central processing unit includes acquisition control module, for realizing digital signal Auto-matching module application, The programming Control of signal conditioning module application, analog-to-digital conversion module application comprising FPGA module, the FPGA module have journey Sequence module, described program module include threshold values Auto-matching module application, the application of digital signal measurement analysis module, gain adjustment Circuit control module application, the application of analog to digital conversion circuit control module, synchronization signal processing module application, computing module are used for Digital signal is handled in real time and operation, threshold values Auto-matching module application control number for the acquisition control module Analog conversion circuit generates initial value and is compared with input signal, and acquisition control module judges digital-to-analogue conversion electricity to interpretation of result Whether threshold values if not threshold values changes the input of D/A converting circuit to the output valve on road, so that the output of D/A converting circuit It is exactly the corresponding threshold voltage of input signal, digital signal measures analysis module application, for analyzing digital signal, The duty ratio and cycle length for calculating digital signal, calculate the characteristic information of digital signal, signal conditioning circuit control module Using for selecting coupled modes and gain factor, analog to digital conversion circuit control module application, for compiling to analog-to-digital conversion module Process control so that chip have different sample rates, synchronization signal processing module application, for each channel digital signal, Analog signal synchronizes processing, so that each channel signal is synchronous；

The digital signal output of the sensor is connected with the first protection circuit input, the first protection circuit output and first Filter circuit input is connected, and the first filter circuit is exported to be connected with the input of the signal of signal transformation circuit, and signal transformation circuit is defeated It is connected out with level shifting circuit input, level shifting circuit output is connected with the input of central processing unit first, central processing The shaping output of unit is connected with the input of D/A converting circuit, the output of D/A converting circuit and the shaping of signal transformation circuit Input is connected, and the analog signal output of the sensor is connected with the input of the second protection circuit, the output of the second protection circuit It is connected with the input of the second filter circuit, the output of the second filter circuit is connected with the input of coupled modes selection circuit, coupling The output of mode selection circuit is connected with the input of the signal of gain adjusting circuit, the output of gain adjusting circuit and analog-to-digital conversion electricity The input on road is connected, and the second input that analog to digital conversion circuit exports with central processing unit is connected, the coupling of central processing unit Control output is connected with the coupling of coupled modes selection circuit control input, the gain adjustment output and gain of central processing unit The gain adjustment input for adjusting circuit is connected, and the data/address bus output of the acquisition control module is defeated with computing module data/address bus Enter connection.

A kind of signal processing apparatus, which is characterized in that described device includes digital signal processing unit, central processing list Member, the digital signal processing unit, for determining the respective thresholds of the digital signal of input in digital signal input, and Level needed for the digital signal level of input is converted to central processing unit according to determining respective thresholds, central processing list Member receives the digital signal handled through digital signal processing unit, and calculate described defeated for controlling digital signal processing unit The digital signal operation and processing entered, the operation and processing include duty ratio, the measurement in period, frequency, the number letter The input of number processing unit is connected with sensor signal data output, and digital signal processing unit exports and central processing unit first Input is connected.

The central processing unit includes acquisition control module, for realizing the main Auto-matching mould for realizing digital signal The programming Control of block application, signal conditioning module application, analog-to-digital conversion module application comprising FPGA module, the FPGA mould Block have program module, described program module include threshold values Auto-matching module application, digital signal measurement analysis module application, The application of gain adjusting circuit control module, the application of analog to digital conversion circuit control module, synchronization signal processing module application, operation mould Block, for being handled in real time digital signal and operation, the threshold values Auto-matching module application is used for the acquisition control Module control D/A converting circuit generates initial value and is compared with input signal, and acquisition control module is to interpretation of result, judgement Whether threshold values if not threshold values changes the input of D/A converting circuit to the output valve of D/A converting circuit, so that digital-to-analogue conversion The output of circuit is exactly the corresponding threshold voltage of input signal, and digital signal measures analysis module application, for believing number It number is analyzed, calculates the duty ratio and cycle length of digital signal, calculate the characteristic information of digital signal, signal condition electricity Road control module application, for selecting coupled modes and gain factor, analog to digital conversion circuit control module application, for modulus Conversion module programming Control, so that chip has different sample rates, synchronization signal processing module application, for each channel Digital signal, analog signal synchronize processing, so that each channel signal is synchronous；

The digital signal output of the sensor is connected with the first protection circuit input, the first protection circuit output and first Filter circuit input is connected, and the first filter circuit is exported to be connected with the input of the signal of signal transformation circuit, and signal transformation circuit is defeated It is connected out with level shifting circuit input, level shifting circuit output is connected with the input of central processing unit first, central processing The shaping output of unit is connected with the input of D/A converting circuit, the output of D/A converting circuit and the shaping of signal transformation circuit Input is connected, and data/address bus output and the input of computing module data/address bus of the acquisition control module connect.

A kind of signal processing apparatus, which is characterized in that described device includes analogy signal processing unit, central processing list Member, the analogy signal processing unit, in analog signal input, analogy signal processing unit manually to select input The analog signal of input modulus is enlarged into according to determining corresponding coupled modes after the corresponding coupled modes of analog signal to turn Change required voltage, central processing unit is received and handled through analogy signal processing unit for controlling analogy signal processing unit Analog signal, and the analog signal operation and processing of the input are calculated, the measurement of the operation and processing including voltage, institute It states analogy signal processing unit input to be connected with sensor analog signals output, analogy signal processing unit output and central processing The input of unit second is connected.

Further, the analogy signal processing unit includes signal conditioning module, defeated for acquiring and improving analog signal Analog-to-digital conversion module is arrived out comprising the second protection circuit, the second filter circuit, coupled modes selection circuit and gain adjustment electricity Road, the second protection circuit are used to carry out overvoltage protection and electrostatic protection to input signal, and filter circuit is for filtering input High-frequency Interference in signal, coupled modes selection circuit are used for through central processing unit selection signal coupled modes, the coupling Mode include differential DC coupled modes, difference AC-coupled mode, single-end DC coupled modes, single-ended AC coupled mode and ICP coupled modes, gain adjusting circuit is for amplifying input signal through central processing unit, analog-to-digital conversion module, including anti- Aliasing filter circuit and analog to digital conversion circuit, the Anti-aliasing Filter Circuits are used to carry out anti-aliasing filter processing, mould to signal For number conversion circuit for converting analog signals into digital signal, the gain adjusting circuit includes that high-accuracy low-power consumption operation is put Big device, the high-accuracy low consumed power operational amplifier are AD8682, and analog-digital conversion circuit as described includes ADC chip, described to ADC Chip is high-precision low-power consumption A/D chip through central processing unit programming Control, the ADC chip, the high-precision low-power consumption AD Chip is CS5361, and the CS5361 has 24 data bits, and high s/n ratio reaches as high as the sample rate of 204.8ksps, institute Stating central processing unit includes acquisition control module, for realizing the main Auto-matching module application for realizing digital signal, letter The programming Control of the application of number conditioning module, analog-to-digital conversion module application comprising FPGA module, the FPGA module have program Module, described program module include threshold values Auto-matching module application, the application of digital signal measurement analysis module, gain adjustment electricity Road control module application, analog to digital conversion circuit control module application, synchronization signal processing module application, computing module, for pair Digital signal is handled in real time and operation；

The analog signal output of the sensor with second protection circuit input be connected, second protection circuit output and The input of second filter circuit is connected, and the output of the second filter circuit is connected with the input of coupled modes selection circuit, coupling side The output of formula selection circuit is connected with the input of the signal of gain adjusting circuit, the output of gain adjusting circuit and analog to digital conversion circuit Input be connected, analog to digital conversion circuit output is inputted with the second of central processing unit to be connected, the coupling control of central processing unit System output is connected with the coupling of coupled modes selection circuit control input, gain adjustment output and the gain tune of central processing unit The gain adjustment input on economize on electricity road is connected, data/address bus output and the input of computing module data/address bus of the acquisition control module Connection.

A kind of signal processing method, which is characterized in that the method includes when digital signal inputs, front stage circuits are determined The respective thresholds of the digital signal of input, and the digital signal level of input is converted into rear class institute according to determining respective thresholds Need level.

Further, the front stage circuits determine the respective thresholds of the digital signal of input, and according to determining respective thresholds It includes presetting relatively threshold values that the digital signal level of input, which is converted to level needed for rear class, by the relatively threshold values and input Digital signal compare, judge whether be input digital signal threshold values, if it is not, then change compare threshold values, continue Compared with the digital signal of input, until comparing the threshold values that threshold values is the digital signal of input, according to current comparison threshold values, The digital signal level of input is converted into level needed for rear class, if so, according to presetting comparison threshold values, by the number of input Word signal level is converted to level needed for rear class.

A kind of signal processing method, which is characterized in that the method includes when analog signal inputs, front stage circuits are determined The corresponding coupled modes of the analog signal of input, and be enlarged into the analog signal of input according to determining corresponding coupled modes Voltage needed for rear class.

Further, the front stage circuits determine the corresponding coupled modes of the analog signal of input, and according to determining corresponding Coupled modes the analog signal of input is enlarged into voltage needed for rear class includes presetting coupled modes, by the coupled modes The analog signal for receiving input, judges whether the analog signal that can receive input, if it is not, change coupled modes, after Analog signal is received in continued access, and the analog signal until receiving input puts the analog signal of input according to current coupled modes Greatly voltage needed for rear class, if it can, the analog signal of input is then enlarged into voltage needed for rear class.

The present invention is framework with digital regulation resistance, operational amplifier, level translator, FPGA, constructs a kind of threshold values The digital signal acquiring circuit of voltage Auto-matching, the letter such as duty ratio, cycle length, frequency can be carried out to digital signal by having The advantageous effects that breath carries out high-acruracy survey construct a kind of coupling side using operational amplifier, AD converter as framework The adjustable analog signal conditioning circuit of formula, gain factor, measurement accuracy is high, and measuring range is wide, can be compatible with single-ended, difference, ICP Equal multiple types analog signal, using FPGA+DSP as core, construct multichannel digital signal, analog signal synchronous acquisition with Analyzer has high measurement accuracy, sampling rate height, arithmetic speed height, signal analysis ability strong, can be realized multi-channel digital Signal, the synchronous acquisition of analog signal and analysis meet the needs of different sensors application, at the same bring measurement accuracy it is high, Measurement range is wide, Auto-matching digital signal voltage threshold values, can be realized different amplitudes, duty ratio, the digital signal of frequency Threshold values Auto-matching, and the information such as the duty ratio to digital signal, cycle length, frequency carry out precise measurement and analysis measurement essence Degree is high, and test scope is wide, can satisfy the demand of coupled modes, the analog signal precise measurement of different amplitudes, interactive operation side Just, real time signal processing and analysis ability are strong, can satisfy multichannel digital signal, analog signal synchronizes acquisition in real time and analysis The advantageous effects of the demand of measurement.

Detailed description of the invention

The total general schematic view of signal analyzer structure in Fig. 1 embodiment of the present invention；

The total module diagram of signal analyzer multi-pass in Fig. 2 embodiment of the present invention；

Digital signal processing unit module diagram in Fig. 3 embodiment of the present invention；

Analogy signal processing unit module diagram in Fig. 4 embodiment of the present invention；

Analog-to-digital conversion module circuit diagram in analogy signal processing unit in Fig. 5 embodiment of the present invention；

Digital signal processing method flow diagram in Fig. 6 a embodiment of the present invention；

Analog signal processing method flow diagram in Fig. 6 b embodiment of the present invention；

Each the functional block diagram of Fig. 7 central processing unit of the embodiment of the present invention.

In figure: 101- digital signal processing unit, 102- analogy signal processing unit, 103- central processing unit, 104- Auto-matching module, 105- first protect circuit, the first filter circuit of 106-, 107- signal transformation circuit, 108- digital-to-analogue conversion Circuit, 109- level switch module, 110- signal conditioning module, 111- second protect circuit, the second filter circuit of 112-, 113- Coupled modes selection circuit, 114- gain adjusting circuit, 115- analog-to-digital conversion module, 116- Anti-aliasing Filter Circuits, 117- mould Number conversion circuit, 118- acquisition control module, 119-FPGA, 120- computing module, 121- level shifting circuit, 301- threshold values is certainly Dynamic matching module application, the measurement analysis module application of 302- digital signal, 303- signal conditioning module circuit control module application, 304- analog to digital conversion circuit control module application, 305- synchronization signal processing module application, 501- digital signal processing unit are defeated Entering, the output of 502- sensor signal data, the output of 503- digital signal processing unit, 504- central processing unit first inputs, The input of 505- analogy signal processing unit, the output of 506- Sensor Analog Relay System, the output of 507- analogy signal processing unit, the center 508- Processing unit second inputs, 510- central processing unit shaping output, 511- signal transformation circuit shaping input, 513- centre Manage unit coupling control output, the coupling control input of 514- coupled modes selection circuit, 515- central processing unit gain adjustment Output, the input of 516- gain adjusting circuit gain adjustment.

Specific embodiment

The present invention is described further below in conjunction with attached drawing:

Embodiment 1:

This example is that a kind of digital signal device is as shown in Figure 1, 2, 3, and the present apparatus includes digital signal processing unit 101, In digital signal input, the respective thresholds of the digital signal of input are determined, and according to determining respective thresholds by the number of input Word signal level is converted to level needed for central processing unit, and digital signal processing unit 101 includes Auto-matching module 104, The threshold values of different amplitude digital signals for identification, and the digital signal of input is converted into Transistor-Transistor Logic level comprising the first protection Circuit 105, the first filter circuit 106, signal transformation circuit 107 and D/A converting circuit 108, the first protection circuit 105 are used for Overvoltage protection and electrostatic protection are carried out to input signal, the first filter circuit 106 is used for the High-frequency Interference in filtered input signal, Transistor-Transistor Logic level of the signal transformation circuit 107 for comparator input signal and threshold voltage and outputting standard, D/A converting circuit 108 Generate threshold voltage；Level switch module 109, including level shifting circuit 121 are converted into identification signal for TTL signal, know Level signal is 101 received signal of central processing unit；Signal transformation circuit 107 includes digital regulation resistance, model MAX5439, MAX5439 have 128 taps, and for generating different threshold voltages, signal transformation circuit 107 includes operation amplifier Device, operational amplifier OPA140, for exporting TTL signal, level shifting circuit 121 includes SN74LVC164245, is used for TTL signal is converted to identification signal, and identification signal is 0~3.3V signal.Central processing unit 103, for controlling digital signal Processing unit receives the digital signal handled through digital signal processing unit, and to the digital signal operation of the input and place Reason, the operation and processing include duty ratio, the measurement in period, frequency, or for controlling analogy signal processing unit, and are connect Receive the analog signal data through analog-to-digital conversion in analogy signal processing unit, and to the analog signal data operation of the input and Processing, the operation and processing include the measurement of voltage, and central processing unit includes acquisition control module 118, for realizing The main Auto-matching module application 301 for realizing digital signal, signal conditioning module apply 304 using 303, analog-to-digital conversion module Programming Control comprising FPGA module 119, FPGA module 119 have program module, program module includes threshold values Auto-matching Module application 301, digital signal measurement analysis module apply 303, analog-to-digital conversion using 302, gain adjusting circuit control module Circuit control module applies 305 using 304, synchronization signal processing module, and computing module 120 is real for carrying out to digital signal When processing and operation, FPGA module 119 be Spartan-3A family chip, computing module 120 includes dsp chip, and dsp chip is 6000 family chip of DSP, 6000 family chip of DSP have 300MHz dominant frequency, digital signal processing unit input 501 and sensing Device digital signal output 502 is connected, and digital signal processing unit output 503 is connected with the input of central processing unit first 504, passes The digital signal output 502 of sensor is connected with the first protection circuit input, and the first protection circuit output and the first filter circuit are defeated Enter connected, the output of the first filter circuit is connected with the input of the signal of signal transformation circuit, signal transformation circuit output and level turn Circuit input is changed to be connected, level shifting circuit output is inputted with central processing unit first 508 to be connected, central processing unit it is whole Shape output 510 is connected with the input of D/A converting circuit, and the output of D/A converting circuit and the shaping 511 of signal transformation circuit are defeated Enter connected, data/address bus output and the input connection of computing module data/address bus of acquisition control module.

As shown in fig. 7, central processing unit 103 includes threshold values Auto-matching module application 301, digital signal measurement analysis Module application 302, gain adjusting circuit control module apply 304, synchronization signal using 303, analog to digital conversion circuit control module Processing module applies 305, and threshold values Auto-matching module application 301 controls D/A converting circuit for acquisition control module 118 108 generation initial values are compared with input signal, and acquisition control module 118 judges D/A converting circuit 108 to interpretation of result Output valve whether threshold values changes the input of D/A converting circuit 108 if not threshold values so that D/A converting circuit 108 Output is exactly the corresponding threshold voltage of input signal, and digital signal measures the function that analysis module applies 302, for number Signal is analyzed, and is calculated the duty ratio and cycle length of digital signal, is calculated the characteristic information of digital signal, signal condition Circuit control module applies 303, and for selecting coupled modes and gain factor, analog to digital conversion circuit control module applies 304, uses In to analog-to-digital conversion module programming Control, so that chip has different sample rates, synchronization signal processing module applies 305 function Can, processing is synchronized for digital signal, the analog signal to each channel, so that each channel signal is synchronous.

In the present embodiment, circuit 105, the first filter circuit are protected including first in Auto-matching module 104 106, signal transformation circuit 107 and D/A converting circuit 108, first protection circuit 105 to input signal carry out overvoltage protection and Electrostatic protection, the first filter circuit 106 realize the High-frequency Interference in filtered input signal, and D/A converting circuit 108 generates input Input signal is compared by the threshold voltage of signal, signal transformation circuit 107 with threshold voltage, the 5V TTL electricity of outputting standard Flat, level shifting circuit 121 is level signal this technological means that 5V TTL signal is converted into FPGA119 can be identified, Advantageous effects with the threshold values that oneself can identify different amplitude digital signals.

The digital signal of input can be converted into standard 5V Transistor-Transistor Logic level, then convert thereof into the level that FPGA can be identified Signal, to FPGA module, the information such as duty ratio, period, frequency can be carried out to digital signal by, which having, carries out high-precision survey for output The advantageous effects of amount.

Embodiment 2

This example is a kind of analog signal instrumentation, as shown in Fig. 1,2,4,5, including analogy signal processing unit 102, it is used for Analog signal input when, analogy signal processing unit manually select input analog signal corresponding coupled modes after basis The analog signal of input is enlarged into voltage needed for analog-to-digital conversion, analogy signal processing unit by determining corresponding coupled modes 102 are output to analog-to-digital conversion module for acquiring and improving analog signal including signal conditioning module 110 comprising second protects Protection circuit 111, the second filter circuit 112, coupled modes selection circuit 113 and gain adjusting circuit 114, the second protection circuit 111 for carrying out overvoltage protection and electrostatic protection to input signal, and the second filter circuit is for the high frequency in filtered input signal Interference, coupled modes selection circuit 113 are used for through 103 selection signal coupled modes of central processing unit, and coupled modes include poor Divide dc-couple mode, difference AC-coupled mode, single-end DC coupled modes, single-ended AC coupled mode and the coupling side ICP Formula, gain adjusting circuit 114 is for amplifying input signal through central processing unit 103；Analog-to-digital conversion module 115, including it is anti- Aliasing filter circuit 116 and analog to digital conversion circuit 117, Anti-aliasing Filter Circuits 116 are used to carry out at anti-aliasing filter signal Reason, analog to digital conversion circuit 117 is for converting analog signals into digital signal；Gain adjusting circuit 114 includes high-accuracy low function Operational amplifier is consumed, high-accuracy low consumed power operational amplifier is AD8682, and analog to digital conversion circuit 117 includes ADC chip, to ADC For chip through 103 programming Control of central processing unit, ADC chip is high-precision low-power consumption A/D chip, high-precision low-power consumption A/D chip There are 24 data bits for CS5361, CS5361, high s/n ratio reaches as high as the sample rate of 204.8ksps.Central processing list Member 103 receives the digital signal handled through digital signal processing unit, and to described for controlling digital signal processing unit The digital signal operation and processing of input, the operation and processing include duty ratio, the measurement in period, frequency, or for controlling Analogy signal processing unit processed, and the analog signal data through digital-to-analogue conversion in analogy signal processing unit is received, and to described The analog signal data operation and processing of input, the operation and processing include the measurement of voltage, and central processing unit includes Acquisition control module 118 is answered for realizing main Auto-matching module application 301, the signal conditioning module for realizing digital signal 304 programming Control is applied with 303, analog-to-digital conversion module comprising FPGA module 119, FPGA module 119 have program mould Block, program module include threshold values Auto-matching module application 301, digital signal measurement analysis module using 302, gain adjustment electricity Road control module applies 305 using 304, synchronization signal processing module using 303, analog to digital conversion circuit control module, operation mould Block 120, for being handled in real time digital signal and operation, FPGA module 119 is Spartan-3A family chip, operation mould Block 120 includes dsp chip, and dsp chip is 6000 family chip of DSP, and 6000 family chip of DSP has 300MHz dominant frequency, mould Quasi- signal processing unit input 505 is connected with Sensor Analog Relay System output 506, analogy signal processing unit output 507 and centre It manages the input of unit second 508 to be connected, the analog signal output 505 of sensor is connected with the input of the second protection circuit, and second protects The output of protection circuit is connected with the input of the second filter circuit, and the output of the second filter circuit is defeated with coupled modes selection circuit Enter connected, the output of coupled modes selection circuit is connected with the input of the signal of gain adjusting circuit, the output of gain adjusting circuit It is connected with the input of analog to digital conversion circuit, the second input 508 that analog to digital conversion circuit exports with central processing unit is connected, center The coupling control output 513 of processing unit is connected with the coupling of coupled modes selection circuit control input 514, central processing unit Gain adjustment output 515 input 516 with the gain adjustment of gain adjusting circuit and be connected, the data/address bus of acquisition control module is defeated It inputs and connects with computing module data/address bus out.

In the present embodiment, circuit 111, the second filter circuit are protected including second in signal conditioning circuit 110 112, coupled modes selection circuit 113 and gain adjusting circuit 114, the second protection circuit 111 carry out over-voltage guarantor to input signal Shield and electrostatic protection；Second filter circuit 112 realizes the High-frequency Interference in filtered input signal, coupled modes selection circuit 113 By controlling FPGA119, unlike signal coupled modes are selected, the coupled modes of selection have differential DC coupled modes, difference to hand over Stream coupled modes, single-end DC coupled modes, single-ended AC coupled mode and ICP coupled modes, gain adjusting circuit 114 will be defeated Enter signal according to certain gain factor, signal is amplified, enables signals to the range for more preferably matching analog-digital converter, mention The accuracy and sensitivity of high measurement, by the way that the coupled modes that selection sensor matches can be switched to FPGA119 programming Control With select suitable gain factor, sensor signal that so both can be high with precise measurement amplitude has accurate test amplitude low Sensor signal, a kind of coupled modes, the adjustable analog signal conditioning circuit of gain factor, measurement accuracy is high, measuring range Width can be compatible with the advantageous effects of the multiple types analog signal such as single-ended, difference, ICP.

Analog-to-digital conversion module 115 converts input signals into digital signal, and analog-to-digital conversion module 115 includes anti-aliasing filter Circuit 116 and ADC conversion chip composition.Wherein Anti-aliasing Filter Circuits carry out the output signal of signal conditioning circuit anti-aliasing Filtering processing, ADC conversion chip convert analog signals into digital signal, are programmed control to ADC conversion chip, have real The data conversion advantageous effects of existing different sample rates.

Embodiment 3

This example is a kind of signal analyzer, as shown in Fig. 1,2,3,4,5, including digital signal processing unit 101, it is used for In digital signal input, the respective thresholds of the digital signal of input are determined, and according to determining respective thresholds by the number of input Word signal level is converted to level needed for central processing unit, and digital signal processing unit 101 includes Auto-matching module 104, The threshold values of different amplitude digital signals for identification, and the digital signal of input is converted into Transistor-Transistor Logic level comprising the first protection Circuit 105, the first filter circuit 106, signal transformation circuit 107 and D/A converting circuit 108, the first protection circuit 105 are used for Overvoltage protection and electrostatic protection are carried out to input signal, the first filter circuit 106 is used for the High-frequency Interference in filtered input signal, Transistor-Transistor Logic level of the signal transformation circuit 107 for comparator input signal and threshold voltage and outputting standard, D/A converting circuit 108 Generate threshold voltage；Level switch module 109, including level shifting circuit 121 are converted into identification signal for TTL signal, know Level signal is 101 received signal of central processing unit；Signal transformation circuit 107 includes digital regulation resistance, model MAX5439, MAX5439 have 128 taps, and for generating different threshold voltages, signal transformation circuit 107 includes operation amplifier Device, operational amplifier OPA140, for exporting TTL signal, level shifting circuit 121 includes SN74LVC164245, is used for TTL signal is converted to identification signal, and identification signal is 0~3.3V signal.

Analogy signal processing unit 102, in analog signal input, analogy signal processing unit manually to select defeated The analog signal of input is enlarged into mould according to determining corresponding coupled modes after the corresponding coupled modes of the analog signal entered Voltage needed for number is converted, analogy signal processing unit 102 includes: signal conditioning module 110, for acquiring and improving simulation letter Number, it is output to analog-to-digital conversion module comprising the second protection circuit 111, the second filter circuit 112, coupled modes selection circuit 113 and gain adjusting circuit 114, the second protection circuit 111 is used to carry out input signal overvoltage protection and electrostatic protection, and second Filter circuit is used for for the High-frequency Interference in filtered input signal, coupled modes selection circuit 113 through central processing unit 103 Selection signal coupled modes, coupled modes include differential DC coupled modes, difference AC-coupled mode, single-end DC coupling side Formula, single-ended AC coupled mode and ICP coupled modes, gain adjusting circuit 114 are used to believe input through central processing unit 103 Number amplification；Analog-to-digital conversion module 115, including Anti-aliasing Filter Circuits 116 and analog to digital conversion circuit 117, Anti-aliasing Filter Circuits 116 for carrying out anti-aliasing filter processing to signal, and analog to digital conversion circuit 117 is for converting analog signals into digital signal； Gain adjusting circuit 114 includes high-accuracy low consumed power operational amplifier, and high-accuracy low consumed power operational amplifier is AD8682, modulus Conversion circuit 117 includes ADC chip, and to ADC chip through 103 programming Control of central processing unit, ADC chip is the low function of high-precision A/D chip is consumed, high-precision low-power consumption A/D chip is CS5361, and CS5361 has 24 data bits, and high s/n ratio reaches as high as The sample rate of 204.8ksps.

Central processing unit 103, for controlling digital signal processing unit, what reception was handled through digital signal processing unit Digital signal, and digital signal operation and processing to the input, the operation and processing include duty ratio, period, frequency The measurement of rate, or for controlling analogy signal processing unit, and receive the simulation through analog-to-digital conversion in analogy signal processing unit Signal data, and analog signal data operation and processing to the input, the operation and processing include the measurement of voltage, Central processing unit includes acquisition control module 118, Auto-matching module application 301, signal tune for realizing digital signal Reason module application 303, analog-to-digital conversion module apply 304 programming Control comprising FPGA module 119, FPGA module 119 have Program module, program module include threshold values Auto-matching module application 301, digital signal measurement analysis module using 302, gain It adjusts circuit control module and applies 305 using 304, synchronization signal processing module using 303, analog to digital conversion circuit control module, Computing module 120, for being handled in real time digital signal and operation, FPGA module 119 is Spartan-3A family chip, Computing module 120 includes dsp chip, and dsp chip is 6000 family chip of DSP, and 6000 family chip of DSP has 300MHz master Frequently, analogy signal processing unit input 505 is connected with Sensor Analog Relay System output 506, and analogy signal processing unit output 507 is in The input of Central Processing Unit second 508 is connected, and the analog signal output 505 of sensor is connected with the input of the second protection circuit, the The output of two protection circuits is connected with the input of the second filter circuit, the output of the second filter circuit and coupled modes selection circuit Input be connected, the output of coupled modes selection circuit is connected with the input of the signal of gain adjusting circuit, gain adjusting circuit Output is connected with the input of analog to digital conversion circuit, and the second input 508 that analog to digital conversion circuit exports with central processing unit is connected, The coupling control output 513 of central processing unit is connected with the coupling of coupled modes selection circuit control input 514, central processing The gain adjustment output 515 of unit is connected with the gain adjustment of gain adjusting circuit input 516, and the data of acquisition control module are total Line output is connected with the input of computing module data/address bus.

Central processing unit includes acquisition control module 118, for realizing the main Auto-matching mould for realizing digital signal Block applies 304 programming Control using 301, signal conditioning module using 303, analog-to-digital conversion module comprising FPGA module 119, FPGA module 119 has program module, and program module includes threshold values Auto-matching module application 301, digital signal measurement Analysis module is applied 304 using 303, analog to digital conversion circuit control module using 302, gain adjusting circuit control module, is synchronized Signal processing module applies 305, computing module 120, for being handled in real time digital signal and operation, FPGA module 119 For Spartan-3A family chip, computing module 120 includes dsp chip, and dsp chip is 6000 family chip of DSP, DSP 6000 family chips have 300MHz dominant frequency.

Digital signal processing unit input 501 is connected with sensor signal data output 502, and digital signal processing unit is defeated 503 are connected with the input of central processing unit first 504 out, the digital signal output 502 of sensor and the first protection circuit input It is connected, the first protection circuit output is connected with the input of the first filter circuit, the output of the first filter circuit and signal transformation circuit Signal input is connected, and signal transformation circuit output is connected with level shifting circuit input, level shifting circuit output and centre It manages the input of unit first 508 to be connected, the shaping output 510 of central processing unit is connected with the input of D/A converting circuit, digital-to-analogue The output of conversion circuit is connected with the shaping 511 of signal transformation circuit input, analogy signal processing unit input 505 and sensor Simulation output 506 is connected, and analogy signal processing unit output 507 is connected with the input of central processing unit second 508, sensor Analog signal output 505 is connected with the input of the second protection circuit, and exporting for the second protection circuit is defeated with the second filter circuit Enter connected, the output of the second filter circuit is connected with the input of coupled modes selection circuit, the output of coupled modes selection circuit It is connected with the input of the signal of gain adjusting circuit, the output of gain adjusting circuit is connected with the input of analog to digital conversion circuit, modulus The second input 508 that conversion circuit exports with central processing unit is connected, the coupling control output 513 of central processing unit and coupling The coupling control input 514 of conjunction mode selection circuit is connected, gain adjustment output 515 and the gain adjustment electricity of central processing unit The gain adjustment input 516 on road is connected, and data/address bus output and the input of computing module data/address bus of acquisition control module connect.

In the present embodiment, the Auto-matching module 104 to digital signal, signal tune are realized with FPGA module 119 The PLC technology of module 110, analog-to-digital conversion module 115 is managed, acquisition control module 118 includes FPGA119 chip and its periphery Circuit composition, the main program module of FPGA119 have threshold values Auto-matching module application 301, digital signal measurement analysis module Using 302, signal conditioning circuit control module using 303, analog to digital conversion circuit control module using the processing of 304, synchronization signal Module application 305, the function of threshold values Auto-matching module application 301 are that FPGA119 control D/A converting circuit 108 generates initially Value is compared with input signal, FPGA119 to interpretation of result, judge D/A converting circuit output valve whether threshold values, if It is not threshold values, FPGA119 changes the input of D/A converting circuit 108, so that the output of D/A converting circuit 108 is exactly input letter Number corresponding threshold voltage；Digital signal, which measures analysis module using 302 function, to be analyzed digital signal, can be with Calculate the duty ratio and cycle length of digital signal, and then the information such as frequency for calculating digital signal, signal conditioning circuit control The function of module application 303 processed is selection coupled modes and gain factor；Analog to digital conversion circuit control module applies 304 function It is to control ADC chip programming, so that chip has different sample rates；Synchronization signal processing module is pair using 305 function Digital signal, the analog signal in each channel synchronize processing, so that each channel signal is synchronous, 120 pairs of numbers of DSP module Signal is handled in real time and operation, is mainly made of dsp chip 120 and its peripheral circuit, and the main program module of DSP has reality When signal analysis and processing module, in scheme, the input of digital signal from sensor first passes around Auto-matching module 104, Auto-matching module 104 carries out protection and High frequency filter to digital signal, and carries out automatic to the threshold values of digital signal Match, to identify the threshold values of different digital signal, the digital signal of input is then converted into standard 5V Transistor-Transistor Logic level, and then will It is converted into the level signal that FPGA119 can be identified, FPGA119 module is given in output.Analog signal from sensor is first By signal conditioning module 110, signal conditioning module 110 is filtered analog signal, then selects electricity by coupled modes Road 113 selects the corresponding signal coupled modes of analog signal, is then amplified by the gain of 114 selection signal of gain adjusting circuit Multiple, then by analog-to-digital conversion module 115, be converted and change digital signal into, pass to FPGA119 module.FPGA119 is to institute There is the signal in channel to synchronize processing, and calculates the duty ratio and cycle length of sensor signal data, and then calculate The information such as the frequency of signal pass to DSP module 120；Meanwhile FPGA119 is by the corresponding digital signal of sensor analog signals It is read out, passes to DSP module 120.DSP module is analyzed and is handled in real time to the signal received, has measurement accuracy Height, sampling rate are high, arithmetic speed is fast, signal analysis ability is strong, can be realized the synchronization of multichannel digital signal, analog signal Acquisition and analysis meet the advantageous effects of the needs of different sensors application.

In a particular application, the D/A converting circuit 108 in Auto-matching module 104 by Maxim digital regulation resistance MAX5439 and its peripheral circuit composition, have 128 taps, can generate required different threshold voltages；Signal transformation circuit is adopted It is formed with the operational amplifier OPA140 and peripheral circuit of TI, the TTL signal of 0~5V can be exported；Level shifting circuit uses The TTL signal of 0~5V can be converted into the TTL letter for 0~3.3V that FPGA can be identified by the SN74LVC164245 chip of TI Number, signal conditioning circuit uses high-accuracy low consumed power operational amplifier AD8682, and ultra-low-distortion, signal-to-noise ratio is high, can simulate in fact The precise measurement of signal；The high-precision low-power consumption A/D chip CS5361 of Cirrus Logic company, number are used in A/D converter circuit According to digit 24, signal-to-noise ratio is high, and sample rate reaches as high as 204.8ksps, sufficiently meets the signal acquisition in signal measurement field It is required that.FPGA module uses the Spartan-3A family chip of Xilinx company, and DSP uses the serial core of the DSP 6000 of TI company Piece, dominant frequency up to 300MHz have the Advantageous effect for the real-time signal analysis processing that can sufficiently meet signal measurement field Fruit.

By technical solution as described above, it is not difficult to find out that with digital regulation resistance, operational amplifier, level translator, FPGA is framework, constructs a kind of digital signal acquiring circuit of threshold voltage Auto-matching, at the same can to digital signal into The information such as row duty ratio, cycle length, frequency carry out high-acruracy survey.Using operational amplifier, AD converter as framework, construct A kind of coupled modes, the adjustable analog signal conditioning circuit of gain factor, measurement accuracy is high, and measuring range is wide, can be with compatible with single The multiple types analog signal such as end, difference, ICP constructs multichannel digital signal, analog signal using FPGA+DSP as core Synchronous acquisition and analyzer, have that measurement accuracy is high, sampling rate is high, arithmetic speed is high, signal analysis ability is strong, Neng Goushi Existing multichannel digital signal, the synchronous acquisition of analog signal and analysis meet the Advantageous of the needs of different sensors application Effect, while bringing that measurement accuracy is high, measurement range is wide, Auto-matching digital signal voltage threshold values can be realized different width The threshold values Auto-matching of value, duty ratio, the digital signal of frequency, and the duty ratio to digital signal, cycle length, frequency etc. are believed Breath carries out precise measurement and analysis measurement accuracy is high, and test scope is wide, can satisfy the analog signal of coupled modes, different amplitudes The demand of precise measurement, interactive operation is convenient, real time signal processing and analysis ability are strong, can satisfy multichannel digital signal, Analog signal synchronizes the advantageous effects of acquisition in real time with the demand of analysis measurement.

Under same technical concept and Design Conception, in embodiments of the present invention, a kind of signal processing method is also achieved, As shown in Figure 6 a, when digital signal inputs, front stage circuits determine the respective thresholds of the digital signal of input, and according to determining The digital signal level of input is converted to level needed for rear class by respective thresholds, the method also includes:

The relatively threshold values is compared with the digital signal of input, judges whether to be input by presetting relatively threshold values 201 Digital signal threshold values 202, compare threshold values if it is not, then changing, continue compared with the digital signal inputted, until than Compared with the threshold values for the digital signal that threshold values is input, according to current comparison threshold values, after the digital signal level of input is converted to Level 203 needed for grade, if so, being converted to the digital signal level of input needed for rear class according to presetting comparison threshold values Level 204.

Under same technical concept and Design Conception, in an embodiment of the present invention, a kind of signal processing side is also achieved Method, as shown in Figure 6 b, in analog signal input, front stage circuits determine the corresponding coupled modes of the analog signal of input, and root The analog signal of input is enlarged into voltage needed for rear class according to determining corresponding coupled modes, the method also includes:

Presetting coupled modes 205 are received the analog signal of input by the coupled modes, judge whether to receive defeated The analog signal 206 entered continues to analog signal, the simulation until receiving input if it is not, changing coupled modes The analog signal of input is enlarged into voltage 207 needed for rear class according to current coupled modes by signal, if it can, then will input Analog signal be enlarged into voltage 208 needed for rear class.

Using technical solution of the present invention or those skilled in the art under the inspiration of technical solution of the present invention, design Similar technical solution out, and reach above-mentioned technical effect, it is to fall into protection scope of the present invention.

Claims

1. a kind of signal analyzer, which is characterized in that the analyzer includes:

Digital signal processing unit, analogy signal processing unit, central processing unit, the digital signal processing unit, are used for In digital signal input, the respective thresholds of the digital signal of input are determined, and according to determining respective thresholds by the number of input Word signal level is converted to level needed for central processing unit, the analogy signal processing unit, for inputting in analog signal When, analogy signal processing unit manually select input analog signal corresponding coupled modes after according to determining corresponding coupling The analog signal of input is enlarged into voltage needed for analog-to-digital conversion, the central processing unit, for controlling digital letter by conjunction mode Number processing unit, receives digital signal handle through digital signal processing unit, and to the digital signal operation of the input with Processing, the operation and processing include duty ratio, the measurement in period and frequency, or for controlling analogy signal processing unit, And the analog signal data through analog-to-digital conversion in analogy signal processing unit is received, and transport to the analog signal data of the input It calculates and handles, the measurement of the operation and processing including voltage；

The digital signal processing unit input is connected with sensor signal data output, and digital signal processing unit output is in The input of Central Processing Unit first is connected, and the analogy signal processing unit input is connected with sensor analog signals output, simulates Signal processing unit output is connected with the input of central processing unit second；

The digital signal processing unit includes Auto-matching module, for identification the threshold values of different amplitude digital signals, and will The digital signal of input is converted to Transistor-Transistor Logic level comprising the first protection circuit, the first filter circuit, signal transformation circuit sum number Analog conversion circuit, the first protection circuit are used to carry out input signal overvoltage protection and electrostatic protection, first filtering Circuit is used for comparator input signal and threshold voltage simultaneously for the High-frequency Interference in filtered input signal, the signal transformation circuit The Transistor-Transistor Logic level of outputting standard, the D/A converting circuit generate threshold voltage；Level switch module, including level shifting circuit, It is converted into identification signal for TTL signal, the identification signal is central processing unit received signal, the signal shaping Circuit includes digital regulation resistance, and model MAX5439, the MAX5439 have 128 taps, for generating different threshold values electricity Pressure, signal transformation circuit includes operational amplifier, and the operational amplifier is OPA140, for exporting TTL signal, level conversion Circuit includes SN74LVC164245, is converted to identification signal for TTL signal, the identification signal is 0~3.3V signal；

The analogy signal processing unit includes signal conditioning module, for acquiring and improving analog signal, is output to modulus and turns Block is changed the mold, signal conditioning module includes the second protection circuit, the second filter circuit, coupled modes selection circuit and gain adjustment electricity Road, the second protection circuit are used to carry out overvoltage protection and electrostatic protection to input signal, and filter circuit is for filtering input High-frequency Interference in signal, coupled modes selection circuit are used for through central processing unit selection signal coupled modes, the coupling Mode include differential DC coupled modes, difference AC-coupled mode, single-end DC coupled modes, single-ended AC coupled mode and ICP coupled modes, gain adjusting circuit is for amplifying input signal through central processing unit, analog-to-digital conversion module, including anti- Aliasing filter circuit and analog to digital conversion circuit, the Anti-aliasing Filter Circuits are used to carry out anti-aliasing filter processing, mould to signal For number conversion circuit for converting analog signals into digital signal, the gain adjusting circuit includes that high-accuracy low-power consumption operation is put Big device, the high-accuracy low consumed power operational amplifier are AD8682, and analog-digital conversion circuit as described includes ADC chip, the ADC core Piece is high-precision low-power consumption A/D chip through central processing unit programming Control, the ADC chip, the high-precision low-power consumption AD core Piece is CS5361, and the CS5361 has 24 data bits, and high s/n ratio reaches as high as the sample rate of 204.8ksps；

The central processing unit includes acquisition control module, for realizing the Auto-matching module application of digital signal, signal Conditioning module is applied and the programming Control of analog-to-digital conversion module application comprising FPGA module and computing module, the FPGA mould Block have program module, described program module include threshold values Auto-matching module application, digital signal measurement analysis module application, The application of gain adjusting circuit control module, the application of analog to digital conversion circuit control module and synchronization signal processing module application, operation Module, for being handled in real time digital signal and operation, threshold values Auto-matching module application is used for the acquisition control mould Block control D/A converting circuit generates initial value and is compared with input signal, and acquisition control module judges number to interpretation of result Whether threshold values if not threshold values changes the input of D/A converting circuit to the output valve of analog conversion circuit, so that digital-to-analogue conversion is electric The output on road is exactly the corresponding threshold voltage of input signal, and digital signal measures analysis module application, for digital signal It is analyzed, calculates the duty ratio and cycle length of digital signal, calculate the characteristic information of digital signal, signal conditioning module Using for selecting coupled modes and gain factor, analog to digital conversion circuit control module application, for compiling to analog-to-digital conversion module Process control so that chip have different sample rates, synchronization signal processing module application, for each channel digital signal and Analog signal synchronizes processing, so that each channel signal is synchronous；

The digital signal output of the sensor is connected with the first protection circuit input, the first protection circuit output and the first filtering Circuit input is connected, and the output of the first filter circuit is connected with the input of the signal of signal transformation circuit, signal transformation circuit export and Level shifting circuit input is connected, and level shifting circuit output is connected with the input of central processing unit first, central processing unit Shaping output be connected with the input of D/A converting circuit, the output of D/A converting circuit and the shaping of signal transformation circuit input It is connected, the analog signal output of the sensor is connected with the input of the second protection circuit, and second protects the output of circuit and the The input of two filter circuits is connected, and the output of the second filter circuit is connected with the input of coupled modes selection circuit, coupled modes The signal input of the output of selection circuit and gain adjusting circuit is connected, the output of gain adjusting circuit and analog to digital conversion circuit Input is connected, and the second input that analog to digital conversion circuit exports with central processing unit is connected, the coupling control of central processing unit It exports the coupling control input with coupled modes selection circuit to be connected, the gain adjustment output of central processing unit and gain adjustment The gain adjustment input of circuit is connected, and data/address bus output and the input of computing module data/address bus of the acquisition control module connect It connects.

2. a kind of signal processing apparatus, which is characterized in that described device includes:

Digital signal processing unit, central processing unit, the digital signal processing unit are used in digital signal input, It determines the respective thresholds of the digital signal of input, and according to determining respective thresholds is converted to the digital signal level of input Level needed for Central Processing Unit, central processing unit are received for controlling digital signal processing unit through Digital Signal Processing list The digital signal of member processing, and the digital signal operation and processing of the input are calculated, the operation and processing include duty Than, the measurement in period, frequency, the digital signal processing unit input is exported with sensor signal data to be connected, digital signal Processing unit output is connected with the input of central processing unit first；

The central processing unit includes acquisition control module, for realizing the Auto-matching module application of digital signal, signal Conditioning module is applied and the programming Control of analog-to-digital conversion module application comprising FPGA module and computing module, the FPGA mould Block have program module, described program module include threshold values Auto-matching module application, digital signal measurement analysis module application, The application of gain adjusting circuit control module, the application of analog to digital conversion circuit control module and synchronization signal processing module application, operation Module, for being handled in real time digital signal and operation, the threshold values Auto-matching module application, for acquisition control Molding block control D/A converting circuit generates initial value and is compared with input signal, and acquisition control module sentences interpretation of result Whether threshold values if not threshold values changes the input of D/A converting circuit to the output valve of disconnected D/A converting circuit, so that digital-to-analogue turns The output for changing circuit is exactly the corresponding threshold voltage of input signal, and digital signal measures analysis module application, for number Signal is analyzed, and is calculated the duty ratio and cycle length of digital signal, is calculated the characteristic information of digital signal, signal condition Circuit control module application, for selecting coupled modes and gain factor, analog to digital conversion circuit control module application, for mould Number conversion module programming Control, so that chip has different sample rates, synchronization signal processing module application, for each channel Digital signal and analog signal synchronize processing so that each channel signal is synchronous；

The digital signal output of the sensor is connected with the first protection circuit input, the first protection circuit output and the first filtering Circuit input is connected, and the output of the first filter circuit is connected with the input of the signal of signal transformation circuit, signal transformation circuit export and Level shifting circuit input is connected, and level shifting circuit output is connected with the input of central processing unit first, central processing unit Shaping output be connected with the input of D/A converting circuit, the output of D/A converting circuit and the shaping of signal transformation circuit input It is connected, data/address bus output and the input of computing module data/address bus of the acquisition control module connect.

3. a kind of signal processing apparatus, which is characterized in that described device includes:

Analogy signal processing unit, central processing unit, the analogy signal processing unit are used in analog signal input, Analogy signal processing unit manually select input analog signal corresponding coupled modes after according to determining corresponding coupling The analog signal of input is enlarged into voltage needed for analog-to-digital conversion, central processing unit, for controlling analog signal processing by mode Unit receives the analog signal handled through analogy signal processing unit, and carries out operation and place to the analog signal of the input Reason, the operation and processing include the measurement of voltage, and the analogy signal processing unit input is defeated with sensor analog signals It is connected out, analogy signal processing unit output is connected with the input of central processing unit second；

The analogy signal processing unit includes signal conditioning module, for acquiring and improving analog signal, is output to modulus and turns Change the mold block comprising the second protection circuit, the second filter circuit, coupled modes selection circuit and gain adjusting circuit, described the Two protection circuits are used to carry out overvoltage protection and electrostatic protection to input signal, and the second filter circuit is in filtered input signal High-frequency Interference, coupled modes selection circuit be used for through central processing unit selection signal coupled modes, the coupled modes packet Include differential DC coupled modes, difference AC-coupled mode, single-end DC coupled modes, single-ended AC coupled mode and ICP coupling Conjunction mode, gain adjusting circuit is for amplifying input signal through central processing unit, analog-to-digital conversion module, including anti-aliasing filter Wave circuit and analog to digital conversion circuit, the Anti-aliasing Filter Circuits are used to carry out anti-aliasing filter processing, analog-to-digital conversion to signal For circuit for converting analog signals into digital signal, the gain adjusting circuit includes high-accuracy low consumed power operational amplifier, The high-accuracy low consumed power operational amplifier is AD8682, and analog-digital conversion circuit as described includes ADC chip, the ADC chip warp Central processing unit programming Control, the ADC chip are high-precision low-power consumption A/D chips, and the high-precision low-power consumption A/D chip is CS5361, the CS5361 have 24 data bits, and high s/n ratio reaches as high as the sample rate of 204.8ksps, the center Processing unit includes acquisition control module, Auto-matching module application, signal conditioning module application for realizing digital signal With the programming Control of analog-to-digital conversion module application comprising FPGA module and computing module, the FPGA module have program mould Block, described program module include threshold values Auto-matching module application, the application of digital signal measurement analysis module, gain adjusting circuit Control module application, the application of analog to digital conversion circuit control module and synchronization signal processing module application, computing module are used for logarithm Word signal is handled in real time and operation；

The analog signal output of the sensor is connected with the input of the second protection circuit, the output and second of the second protection circuit The input of filter circuit is connected, and the output of the second filter circuit is connected with the input of coupled modes selection circuit, coupled modes choosing The output of circuit is selected to be connected with the input of the signal of gain adjusting circuit, the output of gain adjusting circuit and analog to digital conversion circuit it is defeated Enter connected, analog to digital conversion circuit output is connected with the second of central processing unit the input, and the coupling of central processing unit controls defeated It is connected out with the coupling of coupled modes selection circuit control input, gain adjustment output and the gain adjustment electricity of central processing unit The gain adjustment input on road is connected, and data/address bus output and the input of computing module data/address bus of the acquisition control module connect It connects.