CN106412766B - A kind of short-wave signal amplitude automatic regulating apparatus and method - Google Patents
A kind of short-wave signal amplitude automatic regulating apparatus and method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The invention belongs to short wave communication field, a kind of short-wave signal amplitude automatic regulating apparatus and method are disclosed, comprising: controllable attenuation/amplifier, A/D converting unit, down coversion filter unit, digital signal processor, audio signal adjust automatically unit；Radio frequency antenna signal output end is connect with controllable attenuation/amplifier signal input part, controllable attenuation/amplifier signal output end is connect with the signal input part of A/D converting unit, the signal output end of A/D converting unit is connect with the signal input part of down coversion filter unit, the signal input part connection of the signal input part, audio signal adjust automatically unit of the signal output end and digital signal processor of down coversion filter unit, the signal output end of digital signal processor are connect with controllable attenuation/amplifier control terminal；The quality of reception and staff that can be improved signal receive comfort when voice signal, while can expand the dynamic range of receiving of receiver.
Description
Technical field
The invention belongs to New Technology Of Shortwave Communication field more particularly to a kind of short-wave signal amplitude automatic regulating apparatus and sides
Method.
Background technique
In short wave communication, wireless signal in transmission process by the interference of several factors so that receiver inlet
RF signal strength variation range it is very big.The input radio frequency signal of receiver only has a microvolt even lower when weak, radio frequency letter
Up to several hundred millivolts when number strong.It is this variation lead to receiver it is difficult to ensure that output signal stability, to the place of follow-up signal
Reason causes difficulty, especially voice signal by exporting in receiver earphone after digital to analog conversion (D/A), and speech can neglect height and neglect
It is low.Speech is too small can not work normally, and speech will appear greatly very much saturation, or even overflow the change of voice.
Existing short-wave receiver handles the radiofrequency signal received by down coversion, filtering etc., the audio that will be obtained
Signal carries out digital to analog conversion (D/A) and is output to earphone, and speech can be fluctuated, influences the quality of signal and relaxing for staff
Appropriateness.
Summary of the invention
The present invention provides a kind of short-wave signal amplitude automatic regulating apparatus and method, can be improved the quality of reception of signal with
And comfort when staff's reception voice signal, while the dynamic range of receiving of receiver can be expanded.
In order to achieve the above objectives, the present invention is realised by adopting the following technical scheme.
Technical solution one:
A kind of short-wave signal amplitude automatic regulating apparatus, the short-wave signal is from radio frequency antenna signal output end, institute
Stating device includes: controllable attenuation/amplifier, A/D converting unit, down coversion filter unit, digital signal processor, audio signal
Adjust automatically unit；
The radio frequency antenna signal output end is connect with controllable attenuation/amplifier signal input part, and the controllable attenuation/
The signal output end of amplifier is connect with the signal input part of A/D converting unit, the signal output end of the A/D converting unit with
The signal input part of down coversion filter unit connects, and the signal output end of the down coversion filter unit is respectively and at digital signal
Manage the signal input part connection of the signal input part, the audio signal adjust automatically unit of device, the digital signal processor
Signal output end connect with controllable attenuation/amplifier control terminal；
Energy detection unit, benchmark comparing unit, control voltage output unit are provided in the digital signal processor
With D/A converting unit；
The signal output end of the down coversion filter unit and the signal input part of energy detection unit connect, the energy
The signal output end of detection unit is connect with the signal input part of benchmark comparing unit, the signal output of the benchmark comparing unit
It holds and is connect with the signal input part of control voltage output unit, the signal output end and D/A of the control voltage output unit turn
The signal input part connection of unit is changed, the signal output end and controllable attenuation/amplifier control terminal of the D/A converting unit connect
It connects.
The characteristics of technical solution one and further improvement are as follows:
(1) setting in the audio signal adjust automatically unit: amplitude detection module, standard value comparison module, signal tune
Mould preparation block, D/A conversion module and analog signal output module；
The signal output end of the down coversion filter unit is connect with the signal input part of amplitude detection module, the amplitude
The signal output end of detection module is connect with the signal input part of standard value comparison module, the signal of the standard value comparison module
Output end and the signal input part of signal adjusting module connect, the signal output end and D/A modulus of conversion of the signal adjusting module
The signal input part of block connects, and the signal output end of the D/A conversion module is connect with the input terminal of analog signal output module.
(2) controllable attenuation/amplifier includes controllable attenuator and controllable amplifier；
The controllable attenuator is for decaying to the radiofrequency signal received according to attenuation coefficient；
The controllable amplifier is for amplifying the radiofrequency signal received according to amplification coefficient；
The A/D converting unit is used to carry out analog-to-digital conversion to controllable attenuation/amplifier output signal, obtains radio frequency number
Word signal；
The rf digital signal that the down coversion filter unit is used to export the A/D converting unit carries out down coversion,
Obtain digital down converted signal；
The digital signal processor is used to receive the digital down converted signal of the down coversion filter unit output, and root
Control voltage is generated according to the digital down converted signal, the control voltage is used to adjust the decaying system of the controllable attenuator
Number, or the amplification coefficient for adjusting the controllable amplifier；
The audio signal adjust automatically unit is used to receive the Digital Down Convert letter of the down coversion filter unit output
Number, and the digital down converted signal of down coversion filter unit output is adjusted, and analogue audio frequency adjusted is believed
Number it is output to earphone.
(3) energy detection unit is used to receive the digital down converted signal of the down coversion filter unit output, meter
The average energy of the digital down converted signal is calculated, and is believed the average energy of the digital down converted signal as RF digital
Number level；
Reference level Lower Threshold and reference level Upper threshold are provided in the benchmark comparing unit, the benchmark is more single
Member is generated for the level, the reference level Lower Threshold and the reference level Upper threshold according to the rf digital signal
The control voltage of level corresponding to the rf digital signal；The control voltage is for adjusting declining for the controllable attenuator
Subtract coefficient, or the amplification coefficient for adjusting the controllable amplifier；
The control voltage output unit is for generating the control voltage and exporting；
The D/A converting unit is used to control voltage progress digital-to-analogue conversion obtaining analog voltage, and by the mould
Intend voltage output to controllable attenuation/amplifier.
(4) the benchmark comparing unit generates the control voltage for corresponding to the level of the rf digital signal, specific to wrap
It includes:
If the level of the rf digital signal is greater than the reference level Upper threshold, the benchmark comparing unit is generated
Control voltage input to controllable attenuator, for adjusting the attenuation coefficient of the controllable attenuator；
If the level of the rf digital signal is less than the reference level Lower Threshold, the benchmark comparing unit is generated
Control voltage input to controllable amplifier, for adjusting the amplification coefficient of the controllable amplifier.
(5) the amplitude detection module is used to receive the digital down converted signal of the down coversion filter unit output, makees
For the audio signal for inputting the amplitude detection module；And calculate the average amplitude of the audio signal；
Standard amplitude is provided in the standard value comparison module, the standard value comparison module is for calculating the standard
The ratio of amplitude and the average amplitude；The standard amplitude is the maximum amplitude of the audio signal；
The signal adjusting module is used for the ratio according to the standard amplitude and the average amplitude, and the audio is believed
The amplitude of number each sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；The signal adjusting module obtains
To after the digital audio and video signals with standard amplitude, it is also used to the center of the digital audio and video signals with standard amplitude
Amplitude is adjusted to meet the digital audio and video signals of the D/A conversion module input demand.
The D/A conversion module is used to the digital audio and video signals carrying out digital-to-analogue conversion, obtains analog audio signal；
The analog signal output module is for carrying out the analog audio signal to be output to earphone.
Technical solution two:
A kind of short-wave signal amplitude automatic adjusting method is adjusted applied to technical solution with the short-wave signal amplitude automatically
Engagement positions, described method includes following steps:
Step 1, controllable attenuation/amplifier decayed to the radiofrequency signal received perhaps amplified and will decaying or
Amplified signal is output to A/D converting unit；
Step 2, the A/D converting unit carries out analog-to-digital conversion to the decaying received or amplified signal, obtains
Rf digital signal；The down coversion filter unit carries out down coversion to the rf digital signal that the A/D converting unit exports,
Obtain digital down converted signal；
Step 3, digital signal processor receives the digital down converted signal, and is produced according to the digital down converted signal
Raw control voltage, the control voltage are used to adjust the attenuation coefficient of the controllable attenuator, or described controllable for adjusting
The amplification coefficient of amplifier；
Step 4, the audio signal adjust automatically unit receives the digital down converted signal, to the Digital Down Convert
Signal is adjusted, and analog audio signal adjusted is exported.
The characteristics of technical solution two and further improvement are as follows:
(1) step 3 specifically comprises the following steps:
(3a) energy detection unit receives the digital down converted signal, calculates the average energy of the digital down converted signal
Amount, and using the average energy of the digital down converted signal as the level of rf digital signal；
Reference level Lower Threshold and reference level Upper threshold are provided in (3b) benchmark comparing unit, the benchmark is more single
Member is generated and is corresponded to according to the level, the reference level Lower Threshold and the reference level Upper threshold of the rf digital signal
In the control voltage of the level of the rf digital signal；The control voltage is used to adjust the decaying system of the controllable attenuator
Number, or the amplification coefficient for adjusting the controllable amplifier；
(3c) control voltage output unit generates the control voltage and exports；
The control voltage is carried out digital-to-analogue conversion by (3d) D/A converting unit, obtains analog voltage, and the simulation is electric
Pressure is output to controllable attenuation/amplifier.
(2) in sub-step (3b), level belonging to the level of rf digital signal is stored in the benchmark comparing unit
The value of the corresponding control voltage of range.
(3) step 4 specifically comprises the following steps:
(4a) amplitude detection module receives the digital down converted signal of the down coversion filter unit output, as input institute
State the audio signal of amplitude detection module；And calculate the average amplitude of the audio signal；
Standard amplitude is provided in (4b) standard value comparison module, the standard value comparison module calculates the standard amplitude
With the ratio of the average amplitude；The standard amplitude is the maximum amplitude of the audio signal；
(4c) signal adjusting module is each by the audio signal according to the ratio of the standard amplitude and the average amplitude
The amplitude of a sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；And by described with standard amplitude
The center amplitude of digital audio and video signals is adjusted to meet the digital audio and video signals of the D/A conversion module input demand；
The digital audio and video signals are carried out digital-to-analogue conversion by (4d) D/A conversion module, obtain analog audio signal；Simulation letter
Number output module carries out the analog audio signal to be output to earphone.
The invention proposes a kind of short-wave signal amplitude automatic regulating apparatus and method, using Digital Signal Processing,
By the two-stage adjust automatically to radiofrequency signal and audio signal so that output signal keeps level appropriate, be unlikely to because
Input signal is too small and can not work normally, and is also unlikely to make receiver that saturation or blocking occur because input signal is too big；
The quality of reception of signal and the comfort of staff are improved, the dynamic range of receiving of receiver has also been enlarged.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of short-wave signal amplitude automatic regulating apparatus provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of internal structure of digital signal processor provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of internal structure of audio signal adjust automatically unit provided in an embodiment of the present invention；
Fig. 4 is the flow diagram of short-wave signal amplitude automatic adjusting method provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of short-wave signal amplitude automatic regulating apparatus, and the short-wave signal is from radio frequency day
Line signal output end, as shown in Figure 1:
Described device includes: controllable attenuation/amplifier, A/D converting unit, down coversion filter unit, Digital Signal Processing
Device, audio signal adjust automatically unit；
The radio frequency antenna signal output end is connect with controllable attenuation/amplifier signal input part, and the controllable attenuation/
The signal output end of amplifier is connect with the signal input part of A/D converting unit, the signal output end of the A/D converting unit with
The signal input part of down coversion filter unit connects, and the signal output end of the down coversion filter unit is respectively and at digital signal
Manage the signal input part connection of the signal input part, the audio signal adjust automatically unit of device, the digital signal processor
Signal output end connect with controllable attenuation/amplifier control terminal；
The digital signal processor and the controllable attenuation/amplifier form a closed loop negative feedback system.The part
The amplitude of radiofrequency signal is adjusted, prevents the peak-to-peak value of the radiofrequency signal of input A/D converting unit beyond A/D sampling
Effective range, and make signal held stationary.
Further, as shown in Fig. 2, to be provided with energy detection unit, benchmark in the digital signal processor more single
Member, control voltage output unit and D/A converting unit；
The signal output end of the down coversion filter unit and the signal input part of energy detection unit connect, the energy
The signal output end of detection unit is connect with the signal input part of benchmark comparing unit, the signal output of the benchmark comparing unit
It holds and is connect with the signal input part of control voltage output unit, the signal output end and D/A of the control voltage output unit turn
The signal input part connection of unit is changed, the signal output end and controllable attenuation/amplifier control terminal of the D/A converting unit connect
It connects.
Specifically, controllable attenuation/the amplifier includes controllable attenuator and controllable amplifier；
The controllable attenuator is for decaying to the radiofrequency signal received according to attenuation coefficient；The controllable amplification
Device is for amplifying the radiofrequency signal received according to amplification coefficient；Subsequent radiofrequency signal is set to be limited to having for A/D sampling
It imitates in range and is handled convenient for follow-up signal.
In the embodiment of the present invention, controllable attenuation/amplifier is using decaying amplification circuit module.Radiofrequency signal input is advanced to decline
Subtract device, laggard amplifier.
When controlling voltage output to attenuator, attenuator enters working condition.Attenuator mainly resists the input of big signal,
Radiofrequency signal is decayed, is made it within the virtual value of AD.The attenuation range of attenuator is 10-20dB, passes through control
The size of voltage Vj controls attenuator to the attenuation degree of signal, and Vj is bigger, decays bigger.
When controlling voltage output to amplifier, amplifier enters working condition, and amplifier mainly puts small-signal
Greatly, make it conducive to AD sampling.The maximum gain amplifier of amplifier is 25dB, controls amplifier by controlling the size of voltage Vf
To the magnification level of signal, Vf is bigger, and gain amplifier is bigger.
When without control voltage output, attenuator and amplifier are in channel status, do not pre-process to signal.
The A/D converting unit is used to carry out analog-to-digital conversion to controllable attenuation/amplifier output signal, obtains radio frequency number
Word signal；
The rf digital signal that the down coversion filter unit is used to export the A/D converting unit carries out down coversion,
Obtain digital down converted signal；
The digital signal processor is used to receive the digital down converted signal of the down coversion filter unit output, and root
Control voltage is generated according to the digital down converted signal, the control voltage is used to adjust the decaying system of the controllable attenuator
Number, or the amplification coefficient for adjusting the controllable amplifier；
Specifically, the energy detection unit is used to receive the Digital Down Convert letter of the down coversion filter unit output
Number, the average energy of the digital down converted signal is calculated, and using the average energy of the digital down converted signal as radio frequency
The level of digital signal；
Illustratively, the average energy that current newest 100 sampled points can be calculated using the method moved in and out, by it
Level as digital radio signal.
Reference level Lower Threshold and reference level Upper threshold are provided in the benchmark comparing unit, the benchmark is more single
Member is generated for the level, the reference level Lower Threshold and the reference level Upper threshold according to the rf digital signal
The control voltage of level corresponding to the rf digital signal；The control voltage is for adjusting declining for the controllable attenuator
Subtract coefficient, or the amplification coefficient for adjusting the controllable amplifier；
It should be noted that reference level is expectation amplitude value of the receiver to the level of digital radio signal, it is desirable to control
Incoming signal level processed fluctuates within the scope of the reference level, and reference level is limited within the effective voltage allowed band of A/D.
When digital radio signal level Vd is less than reference level Lower Threshold Vx, control voltage of the generation for signal amplification
Vf, and Contemporary Digital level of RF signals Vd is smaller, it is bigger with the difference of reference level Lower Threshold Vx, then it controls voltage Vf and gets over
Greatly；
When digital radio signal level Vd is greater than reference level Upper threshold Vs, control voltage of the generation for signal decaying
Vj, and Contemporary Digital level of RF signals Vd is bigger, it is bigger with the difference of reference level Upper threshold Vs, then it controls voltage Vj and gets over
Greatly；
When inputting digital radio signal level between two thresholdings of reference level, control voltage is not generated.
The control voltage output unit is for generating the control voltage and exporting；
The D/A converting unit is used to control voltage progress digital-to-analogue conversion obtaining analog voltage, and by the mould
Intend voltage output to controllable attenuation/amplifier.
You need to add is that D/A converting unit is without voltage output when not having to generate control voltage.Control voltage
By the way of timing output, by DSP CONTROL D/A converting unit timing output.
It should be noted that the benchmark comparing unit generates the control electricity for corresponding to the level of the rf digital signal
Pressure, specifically includes:
If the level of the rf digital signal is greater than the reference level Upper threshold, the benchmark comparing unit is generated
Control voltage input to controllable attenuator, for adjusting the attenuation coefficient of the controllable attenuator；
If the level of the rf digital signal is less than the reference level Lower Threshold, the benchmark comparing unit is generated
Control voltage input to controllable amplifier, for adjusting the amplification coefficient of the controllable amplifier.
Since digital signal processor is not high enough to the lag of the amplitude adjustment of radiofrequency signal and the precision of adjustment, audio letter
Number variation range cannot still meet the requirements, need to further be adjusted.Therefore, it is also desirable to audio signal adjust automatically unit
Adjustment again, after two-stage adjust automatically, the smoothness of the analog audio signal of final output to earphone be can achieve
Within 3dB.
The audio signal adjust automatically unit is used to receive the Digital Down Convert letter of the down coversion filter unit output
Number, and the digital down converted signal of down coversion filter unit output is adjusted, and analogue audio frequency adjusted is believed
Number it is output to earphone.
Further, as shown in figure 3, being provided with amplitude detection module, mark in the audio signal adjust automatically unit
Quasi- value comparison module, signal adjusting module, D/A conversion module and analog signal output module；
The signal output end of the down coversion filter unit is connect with the signal input part of amplitude detection module, the amplitude
The signal output end of detection module is connect with the signal input part of standard value comparison module, the signal of the standard value comparison module
Output end and the signal input part of signal adjusting module connect, the signal output end and D/A modulus of conversion of the signal adjusting module
The signal input part of block connects, and the signal output end of the D/A conversion module is connect with the input terminal of analog signal output module.
Specifically, the amplitude detection module is used to receive the Digital Down Convert letter of the down coversion filter unit output
Number, as the audio signal for inputting the amplitude detection module；And calculate the average amplitude of the audio signal；
Illustratively, the average amplitude of current newest 50 audio samples point is calculated using the method moved in and out.
Standard amplitude is provided in the standard value comparison module, the standard value comparison module is for calculating the standard
The ratio of amplitude and the average amplitude；The standard amplitude is the maximum amplitude of the audio signal；
It should be noted that arithmetic standard amplitude can also suitably choose the value greater than arithmetic maximum amplitude.
The signal adjusting module is used for the ratio according to the standard amplitude and the average amplitude, and the audio is believed
The amplitude of number each sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；The signal adjusting module obtains
To after the digital audio and video signals with standard amplitude, it is also used to the center of the digital audio and video signals with standard amplitude
Amplitude is adjusted to meet the digital audio and video signals of the D/A conversion module input demand.
The D/A conversion module is used to the digital audio and video signals carrying out digital-to-analogue conversion, obtains analog audio signal；
The analog signal output module is for carrying out the analog audio signal to be output to earphone.
The embodiment of the present invention also provides a kind of short-wave signal amplitude automatic adjusting method, applied to described in above-described embodiment
Short-wave signal amplitude automatic regulating apparatus, as shown in figure 4, described method includes following steps:
Step 1, controllable attenuation/amplifier decayed to the radiofrequency signal received perhaps amplified and will decaying or
Amplified signal is output to A/D converting unit；
Step 2, the A/D converting unit carries out analog-to-digital conversion to the decaying received or amplified signal, obtains
Rf digital signal；The down coversion filter unit carries out down coversion to the rf digital signal that the A/D converting unit exports,
Obtain digital down converted signal；
Step 3, digital signal processor receives the digital down converted signal, and is produced according to the digital down converted signal
Raw control voltage, the control voltage are used to adjust the attenuation coefficient of the controllable attenuator, or described controllable for adjusting
The amplification coefficient of amplifier；
The step 3 specifically comprises the following steps:
(3a) energy detection unit receives the digital down converted signal, calculates the average energy of the digital down converted signal
Amount, and using the average energy of the digital down converted signal as the level of rf digital signal；
Reference level Lower Threshold and reference level Upper threshold are provided in (3b) benchmark comparing unit, the benchmark is more single
Member is generated and is corresponded to according to the level, the reference level Lower Threshold and the reference level Upper threshold of the rf digital signal
In the control voltage of the level of the rf digital signal；The control voltage is used to adjust the decaying system of the controllable attenuator
Number, or the amplification coefficient for adjusting the controllable amplifier；
The corresponding control electricity of level range belonging to the level of rf digital signal is stored in the benchmark comparing unit
The value of pressure.
(3c) control voltage output unit generates the control voltage and exports；
The control voltage is carried out digital-to-analogue conversion by (3d) D/A converting unit, obtains analog voltage, and the simulation is electric
Pressure is output to controllable attenuation/amplifier.
Step 4, the audio signal adjust automatically unit receives the digital down converted signal, to the Digital Down Convert
Signal is adjusted, and analog audio signal adjusted is exported.
The step 4 specifically comprises the following steps:
(4a) amplitude detection module receives the digital down converted signal of the down coversion filter unit output, as input institute
State the audio signal of amplitude detection module；And calculate the average amplitude of the audio signal；
Standard amplitude is provided in (4b) standard value comparison module, the standard value comparison module calculates the standard amplitude
With the ratio of the average amplitude；The standard amplitude is the maximum amplitude of the audio signal；
(4c) signal adjusting module is each by the audio signal according to the ratio of the standard amplitude and the average amplitude
The amplitude of a sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；And by described with standard amplitude
The center amplitude of digital audio and video signals is adjusted to meet the digital audio and video signals of the D/A conversion module input demand；
The digital audio and video signals are carried out digital-to-analogue conversion by (4d) D/A conversion module, obtain analog audio signal；Simulation letter
Number output module carries out the analog audio signal to be output to earphone.
A kind of short-wave signal amplitude automatic regulating apparatus provided in an embodiment of the present invention and method, in receiver input radio frequency
Two-stage adjust automatically of signal excursion when within -107dbm~10dbm, by signal amplitude, it is ensured that output
Audio frequency signal amplitude variation range ensure that communication quality within 3db；By the way that radiofrequency signal is decayed or is put automatically
Greatly, the range of receiving of receiver is expanded；The major function that adjust automatically is realized on digital signal processor, improves receiver
Working efficiency, implementation complexity is reduced, convenient for the promotion of follow-up function and perfect.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can store in computer-readable storage medium, which exists
When execution, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic or disk
Etc. the various media that can store program code.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (4)
1. a kind of short-wave signal amplitude automatic regulating apparatus, the short-wave signal is special from radio frequency antenna signal output end
Sign is,
Described device includes: controllable attenuation/amplifier, A/D converting unit, down coversion filter unit, digital signal processor, sound
Frequency signal adjust automatically unit；
The radio frequency antenna signal output end is connect with controllable attenuation/amplifier signal input part, the controllable attenuation/amplification
The signal output end of device is connect with the signal input part of A/D converting unit, the signal output end of the A/D converting unit and lower change
The signal input part of frequency filter unit connects, the signal output end of the down coversion filter unit respectively with digital signal processor
Signal input part, the audio signal adjust automatically unit signal input part connection, the letter of the digital signal processor
Number output end is connect with controllable attenuation/amplifier control terminal；
Controllable attenuation/the amplifier includes controllable attenuator and controllable amplifier；
Energy detection unit, benchmark comparing unit, control voltage output unit and D/ are provided in the digital signal processor
A converting unit；
The signal output end of the down coversion filter unit and the signal input part of energy detection unit connect, the energy measuring
The signal output end of unit is connect with the signal input part of benchmark comparing unit, the signal output end of the benchmark comparing unit with
The signal input part connection of voltage output unit is controlled, the signal output end of the control voltage output unit and D/A conversion are single
The signal input part connection of member, the signal output end of the D/A converting unit are connect with controllable attenuation/amplifier control terminal；
The energy detection unit is used to receive the digital down converted signal of the down coversion filter unit output, calculates the number
The average energy of word down-conversion signal, and using the average energy of the digital down converted signal as the electricity of rf digital signal
It is flat；
Reference level Lower Threshold and reference level Upper threshold are provided in the benchmark comparing unit, the benchmark comparing unit is used
In level, the reference level Lower Threshold and the reference level Upper threshold according to the rf digital signal, generates and correspond to
In the control voltage of the level of the rf digital signal；The control voltage is used to adjust the decaying system of the controllable attenuator
Number, or the amplification coefficient for adjusting the controllable amplifier；
The control voltage output unit is for generating the control voltage and exporting；
The D/A converting unit is used to the control voltage carrying out digital-to-analogue conversion, obtains analog voltage, and the simulation is electric
Pressure is output to controllable attenuation/amplifier；
Wherein, the benchmark comparing unit generates the control voltage for corresponding to the level of the rf digital signal, specifically includes:
If the level of the rf digital signal is greater than the reference level Upper threshold, the control that the benchmark comparing unit generates
Voltage input processed is to controllable attenuator, for adjusting the attenuation coefficient of the controllable attenuator；
If the level of the rf digital signal is less than the reference level Lower Threshold, the control that the benchmark comparing unit generates
Voltage input processed is to controllable amplifier, for adjusting the amplification coefficient of the controllable amplifier；
Amplitude detection module, standard value comparison module, signal adjustment mould are provided in the audio signal adjust automatically unit
Block, D/A conversion module and analog signal output module；
The signal output end of the down coversion filter unit is connect with the signal input part of amplitude detection module, the amplitude detection
The signal output end of module is connect with the signal input part of standard value comparison module, the signal output of the standard value comparison module
End is connect with the signal input part of signal adjusting module, signal output end and the D/A conversion module of the signal adjusting module
Signal input part connection, the signal output end of the D/A conversion module are connect with the input terminal of analog signal output module；
The amplitude detection module is used to receive the digital down converted signal of the down coversion filter unit output, as input institute
State the audio signal of amplitude detection module；And calculate the average amplitude of the audio signal；
Standard amplitude is provided in the standard value comparison module, the standard value comparison module is for calculating the standard amplitude
With the ratio of the average amplitude；The standard amplitude is the maximum amplitude of the audio signal；
The signal adjusting module is used for the ratio according to the standard amplitude and the average amplitude, and the audio signal is each
The amplitude of a sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；The signal adjusting module is had
After the digital audio and video signals for having standard amplitude, it is also used to the center amplitude of the digital audio and video signals with standard amplitude
It is adjusted to meet the digital audio and video signals of the D/A conversion module input demand；
The D/A conversion module is used to the digital audio and video signals carrying out digital-to-analogue conversion, obtains analog audio signal；
The analog signal output module is for carrying out the analog audio signal to be output to earphone.
2. a kind of short-wave signal amplitude automatic regulating apparatus according to claim 1, which is characterized in that the controllable attenuation
Device is for decaying to the radiofrequency signal received according to attenuation coefficient；
The controllable amplifier is for amplifying the radiofrequency signal received according to amplification coefficient；
The A/D converting unit is used to carry out analog-to-digital conversion to controllable attenuation/amplifier output signal, obtains RF digital letter
Number；
The rf digital signal that the down coversion filter unit is used to export the A/D converting unit carries out down coversion, obtains
Digital down converted signal；
The digital signal processor is used to receive the digital down converted signal of the down coversion filter unit output, and according to institute
It states digital down converted signal and generates control voltage, the control voltage is used to adjust the attenuation coefficient of the controllable attenuator, or
Person is used to adjust the amplification coefficient of the controllable amplifier；
The audio signal adjust automatically unit is used to receive the digital down converted signal of the down coversion filter unit output, and
The digital down converted signal of down coversion filter unit output is adjusted, and analog audio signal adjusted is exported
To earphone.
3. it is automatic to be applied to short-wave signal amplitude as claimed in claim 1 or 2 for a kind of short-wave signal amplitude automatic adjusting method
Adjust device, which is characterized in that described method includes following steps:
Step 1, controllable attenuation/amplifier, which decays to the radiofrequency signal received, is perhaps amplified and will decay or amplify
Signal afterwards is output to A/D converting unit；
Step 2, the A/D converting unit carries out analog-to-digital conversion to the decaying received or amplified signal, obtains radio frequency
Digital signal；The down coversion filter unit carries out down coversion to the rf digital signal that the A/D converting unit exports, and obtains
Digital down converted signal；
Step 3, digital signal processor receives the digital down converted signal, and generates control according to the digital down converted signal
Voltage processed, the control voltage are used to adjust the attenuation coefficient of the controllable attenuator, or for adjusting the controllable amplification
The amplification coefficient of device；
The step 3 specifically comprises the following steps:
(3a) energy detection unit receives the digital down converted signal, calculates the average energy of the digital down converted signal,
And using the average energy of the digital down converted signal as the level of rf digital signal；
Reference level Lower Threshold and reference level Upper threshold, the benchmark comparing unit root are provided in (3b) benchmark comparing unit
According to the level of the rf digital signal, the reference level Lower Threshold and the reference level Upper threshold, generates and correspond to institute
State the control voltage of the level of rf digital signal；The control voltage is used to adjust the attenuation coefficient of the controllable attenuator,
Or the amplification coefficient for adjusting the controllable amplifier；
Wherein, the benchmark comparing unit generates the control voltage for corresponding to the level of the rf digital signal, specifically includes:
If the level of the rf digital signal is greater than the reference level Upper threshold, the control that the benchmark comparing unit generates
Voltage input processed is to controllable attenuator, for adjusting the attenuation coefficient of the controllable attenuator；
If the level of the rf digital signal is less than the reference level Lower Threshold, the control that the benchmark comparing unit generates
Voltage input processed is to controllable amplifier, for adjusting the amplification coefficient of the controllable amplifier；
(3c) control voltage output unit generates the control voltage and exports；
The control voltage is carried out digital-to-analogue conversion by (3d) D/A converting unit, obtains analog voltage, and the analog voltage is defeated
Controllable attenuation/amplifier is arrived out；
Step 4, the audio signal adjust automatically unit receives the digital down converted signal, to the digital down converted signal
It is adjusted, and analog audio signal adjusted is exported；
The step 4 specifically comprises the following steps:
(4a) amplitude detection module receives the digital down converted signal of the down coversion filter unit output, as the input width
It is worth the audio signal of detection module；And calculate the average amplitude of the audio signal；
Standard amplitude is provided in (4b) standard value comparison module, the standard value comparison module calculates the standard amplitude and institute
State the ratio of average amplitude；The standard amplitude is the maximum amplitude of the audio signal；
(4c) signal adjusting module is adopted according to the ratio of the standard amplitude and the average amplitude, by the audio signal is each
The amplitude of sampling point is adjusted, and obtains the digital audio and video signals with standard amplitude；And by the number with standard amplitude
The center amplitude of audio signal is adjusted to meet the digital audio and video signals of the D/A conversion module input demand；
The digital audio and video signals are carried out digital-to-analogue conversion by (4d) D/A conversion module, obtain analog audio signal；Analog signal is defeated
Module carries out the analog audio signal to be output to earphone out.
4. a kind of short-wave signal amplitude automatic adjusting method according to claim 3, which is characterized in that sub-step (3b)
In, the corresponding control voltage of level range belonging to the level of rf digital signal is stored in the benchmark comparing unit
Value.
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| CN107948863B (en) * | 2017-12-29 | 2024-12-27 | 陕西烽火电子股份有限公司 | A directional audio signal detection device and method based on FFT |
| CN114280579B (en) * | 2021-12-27 | 2025-03-21 | 武汉市聚芯微电子有限责任公司 | Signal adjustment circuit and imaging device |
| CN115103269A (en) * | 2022-05-23 | 2022-09-23 | 陕西烽火电子股份有限公司 | An automatic control system and method for audio output amplitude |
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