CN110177068B - Signal identification device and method - Google Patents
Signal identification device and method Download PDFInfo
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- CN110177068B CN110177068B CN201910511746.1A CN201910511746A CN110177068B CN 110177068 B CN110177068 B CN 110177068B CN 201910511746 A CN201910511746 A CN 201910511746A CN 110177068 B CN110177068 B CN 110177068B
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- 238000010586 diagram Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
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- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Radar Systems Or Details Thereof (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The embodiment of the invention discloses a signal identification device and a signal identification method, wherein the device comprises a digital processor, a transmitting end transducer, a modem and a receiving end transducer which are electrically connected in sequence; the digital processor is used for controlling the first path of signal parameters and the second path of signal parameters transmitted by the transmitting end transducer; the transmitting end transducer is used for transmitting a first path of signal and a second path of signal; the modem is used for modulating the first path of signals and the second path of signals to obtain modulated signals; the digital processor is used for receiving the modulation signal so as to realize high identification precision, eliminate interference and meet the requirement of high-precision occasions.
Description
Technical Field
The embodiment of the invention relates to a signal processing technology, in particular to a signal identification device and a signal identification method.
Background
The accurate identification of the ultrasonic echo signals is a key ring in the ultrasonic application technology, and has wider application in the fields of medical ultrasound, flow measurement, gas phase measurement and the like.
Most of the currently adopted identification methods adopt signal peak value identification, namely detection is carried out after an echo signal is received, and the time corresponding to a simple identification threshold value is taken as the time for receiving the echo signal.
The method has low recognition precision, is easy to interfere, and can not meet the requirements of high-precision occasions.
Disclosure of Invention
The invention provides a signal identification device and a signal identification method, which are used for realizing high identification precision, eliminating interference and meeting the requirements of high-precision occasions.
In a first aspect, an embodiment of the present invention provides a signal identifying apparatus, including a digital processor, a transmitting-end transducer, a modem, and a receiving-end transducer electrically connected in sequence;
The digital processor is used for controlling the first path of signal parameters and the second path of signal parameters transmitted by the transmitting end transducer;
the transmitting end transducer is used for transmitting a first path of signal and a second path of signal;
the modem is used for modulating the first path of signals and the second path of signals to obtain modulated signals;
the digital processor is configured to receive the modulated signal.
In a second aspect, an embodiment of the present invention further provides a signal identifying method, including:
generating a modulation signal according to a first signal and a second signal, wherein the first signal and the second signal are separated by a preset time period;
and transmitting the first signal and the second signal through a transmitting end transducer, and determining the echo signal duration by a digital processor according to the modulation signal.
The embodiment of the invention comprises a digital processor, a transmitting end transducer, a modem and a receiving end transducer which are electrically connected in sequence; the digital processor is used for controlling the first path of signal parameters and the second path of signal parameters transmitted by the transmitting end transducer; the transmitting end transducer is used for transmitting a first path of signal and a second path of signal; the modem is used for modulating the first path of signals and the second path of signals to obtain modulated signals; the receiving end transducer is used for receiving the modulation signal, and determining the echo signal duration through the modulation signal, so that the recognition accuracy is high, interference can be eliminated, and the requirement of high-accuracy occasions is met.
Drawings
Fig. 1 is a schematic structural diagram of a signal recognition device according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a signal recognition device according to a first embodiment of the present invention;
fig. 3 is a flow chart of a signal identifying method according to a second embodiment of the present invention;
FIG. 4 is a flow chart illustrating the operation of the digital processor according to the second embodiment of the present invention;
Fig. 5 is a schematic waveform diagram of a first path signal according to a second embodiment of the present invention;
fig. 6 is a schematic waveform diagram of determining a duration of an echo signal according to a second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts steps as a sequential process, many of the steps may be implemented in parallel, concurrently, or with other steps. Furthermore, the order of the steps may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example 1
Fig. 1 is a schematic structural diagram of a signal recognition device according to a first embodiment of the present invention, where the signal recognition device according to the first embodiment of the present invention can execute the signal recognition method according to any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. The device comprises a digital processor 101, a transmitting end transducer 102, a modem 103 and a receiving end transducer 104 which are electrically connected in sequence; the digital processor 101 is configured to control a first path of signal parameters and a second path of signal parameters transmitted by the transmitting end transducer; the transmitting end transducer 102 is configured to transmit a first signal and a second signal; the modem 103 is configured to modulate the first path signal and the second path signal to obtain a modulated signal; the receiving transducer 104 is configured to receive the modulated signal.
The digital processor includes, but is not limited to, a DSP chip, a micro control unit (Microcontroller Unit; MCU), also called a single chip Microcomputer (SINGLE CHIP microcomputers), or a single chip Microcomputer, where the DSP chip refers to a chip capable of implementing digital signal processing technology. The DSP chip is a fast powerful microprocessor and is unique in that it can process data in real time. The DSP chip adopts a Harvard structure with separated program and data, has special hardware multipliers and can be used for rapidly realizing various digital signal processing algorithms.
The transducer refers to a device for interconversion of electric energy and acoustic energy. Used in echo sounding device, doppler log and acoustic correlation log. Transducers that convert electrical energy into acoustic energy are referred to as transmitting-end transducers; the transducer that converts acoustic energy into electrical energy is a receiving-end transducer. The transmitting transducer and the receiving transducer are typically used separately, but may also share one. The main performance indexes of the transmitting end transducer and the receiving end transducer are as follows: operating frequency, frequency bandwidth, electroacoustic frequency, impedance at resonance frequency, directivity, sensitivity, and the like.
The device also comprises a plurality of paths of analog switches, wherein the plurality of paths of analog switches are respectively connected with the digital processor and the transmitting end transducer; the multipath analog switch is used for controlling the levels of the first path of signals and the second path of signals through on-off. Wherein, the digital processor is specifically configured to: and outputting the levels of the first path of signals and the second path of signals through pins, wherein the first path of signals and the second path of signals are transmitted to the transmitting end transducer through the multipath analog switch.
The first path signal and the second path signal are signals composed of high and low levels, and by way of example, the high level of the first path signal output from a pin of the digital processor is 3V high level, the low level of the first path signal output is 0V low level, the high level of the second path signal is 3V high level, and the low level of the second path signal output is 0V low level. When the high level of the first path of signals and the second path of signals passes through the multipath analog switch, the multipath analog switch is switched to an on state, the high level of 3V in the first path of signals and the second path of signals is amplified to the high level of 24V, and then the high level is transmitted to the receiving end transducer through the transmitting end transducer.
For example, when the low level of the first path signal and the second path signal is 0V low level, and the multi-path analog switch is switched to the off state, the transmitting end transducer transmits 0V low level, and the transmitting end transducer transmits the signal to the receiving end transducer.
The high-level signals and the low-level signals of the first path of signals and the second path of signals are transmitted through preset time, and the duration of the echo signals can be accurately detected.
The apparatus further comprises: and one end of the amplifying circuit is electrically connected with the receiving end transducer, and the other end of the amplifying circuit is electrically connected with the modem.
After receiving the modulation signal, the receiving end transducer sends the modulation signal to the digital processor through an amplifying circuit, wherein the amplifying circuit comprises: the primary amplifying circuit, the common amplifying circuit and the signal power amplifying circuit, after receiving the modulation signal, the digital processor detects the duration of the echo signal according to the modulation signal, and particularly, the circuit schematic diagram of a signal identifying device shown in fig. 2 can be referred to.
According to the technical scheme, the digital processor, the transmitting end transducer, the modem and the receiving end transducer are electrically connected in sequence; the digital processor is used for controlling the first path of signal parameters and the second path of signal parameters transmitted by the transmitting end transducer; the transmitting end transducer is used for transmitting a first path of signal and a second path of signal; the modem is used for modulating the first path of signals and the second path of signals to obtain modulated signals; the receiving end transducer is used for receiving the modulation signal and detecting the duration of the echo signal through the digital processor so as to realize high identification precision, eliminate interference and meet the requirement of high-precision occasions.
Example two
Fig. 3 is a flow chart of a signal identifying method according to a second embodiment of the present invention, where the present embodiment is applicable to a case of detecting a duration of an echo signal, and the method may be executed by a signal identifying apparatus, and specifically includes the following steps:
step 310, generating a modulation signal according to a first path signal and a second path signal, wherein the first path signal and the second path signal are separated by a preset time period.
In this embodiment, the first path of signals and the second path of signals are set by a digital processor, and the digital processor implements the following process, specifically, refer to a flow chart of the working process of the digital processor shown in fig. 4: initializing variables, controlling display, pressing a key input part, controlling transmission and receiving, waiting for AD acquisition interruption, storing AD data into a memory, windowing signals, FIR filtering, extracting signal envelopes, identifying signal characteristic values, calculating starting points of the signal characteristic values, judging whether the starting points are abnormal or not, and solving time values by an interpolation method.
The first path signal and the second path signal are signals composed of high and low levels, and fig. 5 illustrates a schematic waveform of the first path signal, which includes a high level of 3V and a low level of 0V. The first path of signal and the second path of signal have a phase difference of 0.5 period in a preset time period, for example, if the period interval between the first path of signal and the second path of signal is (n+0.5) T, the value of N is greater than or equal to 2 and less than or equal to 5, and T is the vibration period of the transmitting end transducer.
Step 320, the transmitting end transducer is used for transmitting the first path of signal and the second path of signal, so that the digital processor can determine the duration of the echo signal according to the modulation signal.
In this embodiment, the determining, by the digital processor, the echo signal duration according to the modulation signal includes: taking the zero moment as a starting point, taking the moment of the reverse characteristic value of the modulation signal as an end point, and recording the moment as a first duration; taking the detected modulation signal as a starting point, taking the moment of occurrence of the reverse characteristic value of the modulation signal as an end point, and recording the moment as a second duration; and calculating the difference value between the first time length and the second time length to obtain the echo signal time length.
The characteristic value of the modulation signal can be a wave crest characteristic value or a wave trough characteristic value, and when the modulation signal is on a horizontal reference line of the waveform diagram and the wave crest characteristic value appears in a certain period, the reverse characteristic value of the modulation signal is the wave trough characteristic value; when the wave trough characteristic value appears on the horizontal reference line of the waveform diagram by a certain period, the reverse characteristic value of the modulation signal is the wave crest characteristic value.
In this embodiment, the first time period refers to a time period from when the receiving end transducer is turned on to when the modulating signal has a reverse characteristic value, denoted as T1, and the second time period refers to a time period from when the receiving end transducer receives the modulating signal to when the modulating signal has a reverse characteristic value, denoted as T2, and particularly, reference may be made to a waveform schematic diagram for determining the echo signal time period shown in fig. 6, and specifically, the echo signal time period is T, and the difference is made between the first time period and the second time period. The first path of signal and the second path of signal have a phase difference of 0.5 period, so that the formed modulated signal can show obvious modulation characteristics in a waveform diagram, wherein the modulation characteristics are that an obvious reverse characteristic value appears in an envelope part of the modulated signal, and the duration delta t of the reverse characteristic value is longer than the period of the receiving end transducer, which is 1.5 times of the period of the receiving end transducer. Specifically, the moment when the reverse eigenvalue occurs in the modulation signal can be calculated by the digital processor, specifically, the moment when the zero crossing point of the reverse eigenvalue occurs is counted.
According to the technical scheme, a modulation signal is generated according to a first path of signal and a second path of signal, the first path of signal and the second path of signal are separated by a preset time period, and then the duration of an echo signal is calculated by a digital processor according to the first duration and the second duration, wherein the first duration takes zero time as a starting point, the moment when a reverse characteristic value occurs in the modulation signal as an end point, the second duration takes the detected modulation signal as the starting point, and the moment when the reverse characteristic value occurs in the modulation signal as the end point.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (6)
1. The signal identification device is characterized by comprising a digital processor, a transmitting end transducer, a modem and a receiving end transducer which are electrically connected in sequence;
The digital processor is used for controlling the first path of signal parameters and the second path of signal parameters transmitted by the transmitting end transducer;
the transmitting end transducer is used for transmitting a first path of signal and a second path of signal;
the modem is used for modulating the first path of signals and the second path of signals to obtain modulated signals;
The receiving end transducer is used for receiving the modulation signal;
the digital processor is further configured to: taking the zero moment as a starting point, taking the moment of the reverse characteristic value of the modulation signal as an end point, and recording the moment as a first duration;
Taking the detected modulation signal as a starting point, taking the moment of occurrence of the reverse characteristic value of the modulation signal as an end point, and recording the moment as a second duration;
and calculating the difference value between the first time length and the second time length to obtain the echo signal time length.
2. The apparatus of claim 1, further comprising a multi-way analog switch, the multi-way analog switch being coupled to the digital processor and the transmitting transducer, respectively; the multipath analog switch is used for controlling the levels of the first path of signals and the second path of signals through on-off.
3. The apparatus according to claim 2, wherein the digital processor is specifically configured to:
and outputting the levels of the first path of signals and the second path of signals through pins, wherein the first path of signals and the second path of signals are transmitted to the transmitting end transducer through the multipath analog switch.
4. The apparatus of claim 1, wherein the apparatus further comprises:
And one end of the amplifying circuit is electrically connected with the receiving end transducer, and the other end of the amplifying circuit is electrically connected with the modem.
5. A method of signal identification, comprising:
generating a modulation signal according to a first path of signal and a second path of signal, wherein the first path of signal and the second path of signal are separated by a preset time period;
the first path of signals and the second path of signals are sent through a transmitting end transducer, and the digital processor determines the duration of echo signals according to the modulation signals;
the digital processor for determining the echo signal duration according to the modulation signal comprises the following steps:
Taking the zero moment as a starting point, taking the moment of the reverse characteristic value of the modulation signal as an end point, and recording the moment as a first duration;
Taking the detected modulation signal as a starting point, taking the moment of occurrence of the reverse characteristic value of the modulation signal as an end point, and recording the moment as a second duration;
and calculating the difference value between the first time length and the second time length to obtain the echo signal time length.
6. The method of claim 5, wherein the predetermined period of time has a phase difference of 0.5 cycles.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109186693A (en) * | 2018-08-02 | 2019-01-11 | 电子科技大学 | A kind of detection of the backscatter signal circuit of self-adapting ultrasonic |
| CN109387825A (en) * | 2017-08-11 | 2019-02-26 | 德克萨斯仪器股份有限公司 | Pumping signal sequence for ultrasonic transducer |
| CN209787200U (en) * | 2019-06-13 | 2019-12-13 | 上海一诺仪表有限公司 | Signal recognition device |
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| US4271708A (en) * | 1978-05-16 | 1981-06-09 | Fuji Electric Co., Ltd. | Ultrasonic measuring apparatus |
| CN101055311A (en) * | 2007-03-01 | 2007-10-17 | 中国海洋石油总公司 | Multiple beam section sonar signal processing device |
| CN107229052A (en) * | 2017-07-26 | 2017-10-03 | 桂林电子科技大学 | Trailer-mounted radar Object measuring system and operation method based on Multiple Frequency Shift Keying system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387825A (en) * | 2017-08-11 | 2019-02-26 | 德克萨斯仪器股份有限公司 | Pumping signal sequence for ultrasonic transducer |
| CN109186693A (en) * | 2018-08-02 | 2019-01-11 | 电子科技大学 | A kind of detection of the backscatter signal circuit of self-adapting ultrasonic |
| CN209787200U (en) * | 2019-06-13 | 2019-12-13 | 上海一诺仪表有限公司 | Signal recognition device |
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