CN106412766A - Shortwave signal amplitude automatic adjustment device and method - Google Patents
Shortwave signal amplitude automatic adjustment device and method Download PDFInfo
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- CN106412766A CN106412766A CN201611055345.2A CN201611055345A CN106412766A CN 106412766 A CN106412766 A CN 106412766A CN 201611055345 A CN201611055345 A CN 201611055345A CN 106412766 A CN106412766 A CN 106412766A
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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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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Abstract
The invention belongs to the field of shortwave communication, and discloses a shortwave signal amplitude automatic adjustment device and method. The device comprises a controllable attenuater/amplifier, an A/D conversion unit, a down-conversion filter unit, a digital signal processor and an audio signal automatic adjustment unit. The signal output end of a radio frequency antenna is connected with the signal input end of the controllable attenuater/amplifier. The signal output end of the controllable attenuater/amplifier is connected with the signal input end of the A/D conversion unit. The signal output end of the A/D conversion unit is connected with the signal input end of the down-conversion filter unit. The signal output end of the down-conversion filter unit is connected with the signal input end of the digital signal processor and the signal input end of the audio signal automatic adjustment unit. The signal output end of the digital signal processor is connected with the control end of the controllable attenuater/amplifier. The signal receiving quality and the comfort of staff receiving a speech signal are improved. The dynamic reception range of a receiver is expanded.
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 side
Method.
Background technology
In short wave communication, wireless signal is subject to the interference of several factors so that receiver inlet in transmitting procedure
RF signal strength excursion very big.The input radio frequency signal of receiver only has a microvolt even lower when weak, radio frequency is believed
Up to hundreds of millivolt when number strong.This change leads to receiver it is difficult to ensure that the stability of output signal, the place to follow-up signal
Reason causes difficulty, and particularly voice signal exports after passing through digital to analog conversion (D/A) in receiver earphone, and speech can be neglected height and be neglected
Low.The too little meeting of speech cannot normal work, speech occurs saturation greatly very much, or even overflows the change of voice.
Existing short-wave receiver is processed through down coversion, filtering etc. to the radiofrequency signal receiving, by the audio frequency obtaining
Signal carries out digital to analog conversion (D/A) and exports earphone, and speech can be fluctuated, affects the quality of signal and relaxing of staff
Appropriateness.
Content of the invention
The present invention provides a kind of short-wave signal amplitude automatic regulating apparatus and method, it is possible to increase the quality of reception of signal with
And staff receives comfortableness during voice signal, the dynamic range of receiving of receiver can be expanded simultaneously.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that and is achieved.
Technical scheme one：
A kind of short-wave signal amplitude automatic regulating apparatus, described short-wave signal comes from radio frequency antenna signal outfan, institute
State device to include：Controllable attenuation/amplifier, A/D converting unit, down coversion filter unit, digital signal processor, audio signal
Adjust automatically unit；
Described radio frequency antenna signal outfan is connected with the signal input part of controllable attenuation/amplifier, and described controllable attenuation/
The signal output part of amplifier is connected with the signal input part of A/D converting unit, the signal output part of described A/D converting unit with
The signal input part of down coversion filter unit connects, the signal output part of described down coversion filter unit respectively with digital signal at
The signal input part of reason device, the signal input part of described audio signal adjust automatically unit connect, described digital signal processor
Signal output part be connected with the control end of controllable attenuation/amplifier；
It is provided with described digital signal processor：Energy detection unit, benchmark comparing unit, control voltage output unit
With D/A converting unit；
The described signal output part of down coversion filter unit is connected with the signal input part of energy detection unit, described energy
The signal output part of detector unit is connected with the signal input part of benchmark comparing unit, the signal output of described benchmark comparing unit
End is connected with the signal input part of control voltage output unit, and the signal output part of described control voltage output unit is turned with D/A
The signal input part changing unit connects, and the signal output part of described D/A converting unit is connected with the control end of controllable attenuation/amplifier
Connect.
The feature of technical scheme one and being further improved to：
(1) setting in described audio signal adjust automatically unit：Amplitude detection module, standard value comparison module, signal are adjusted
Mould preparation block, D/A modular converter and analog signal output module；
The signal output part of described down coversion filter unit is connected with the signal input part of amplitude detection module, described amplitude
The signal output part of detection module is connected with the signal input part of standard value comparison module, the signal of described standard value comparison module
Outfan is connected with the signal input part of signal adjusting module, the signal output part of described signal adjusting module and D/A modulus of conversion
The signal input part of block connects, and the signal output part of described D/A modular converter is connected with the input of analog signal output module.
(2) described controllable attenuation/amplifier comprises controllable attenuator and controllable amplifier；
Described controllable attenuator is used for according to attenuation quotient, the radiofrequency signal receiving being decayed；
Described controllable amplifier is used for according to amplification coefficient, the radiofrequency signal receiving being amplified；
Described A/D converting unit is used for carrying out analog digital conversion to the signal of controllable attenuation/amplifier output, obtains radio frequency number
Word signal；
Described down coversion filter unit is used for carrying out down coversion to the rf digital signal of described A/D converting unit output,
Obtain digital down converted signal；
Described digital signal processor is used for receiving the digital down converted signal of described down coversion filter unit output, and root
Produce control voltage according to described digital down converted signal, described control voltage is used for adjusting the decay system of described controllable attenuator
Number, or for adjusting the amplification coefficient of described controllable amplifier；
Described audio signal adjust automatically unit is used for receiving the Digital Down Convert letter of described down coversion filter unit output
Number, and the digital down converted signal of described down coversion filter unit output is adjusted, and the analogue audio frequency after adjustment is believed
Number export earphone.
(3) described energy detection unit is used for receiving the digital down converted signal of described down coversion filter unit output, meter
Calculate the average energy of described digital down converted signal, and the average energy of described digital down converted signal is believed as RF digital
Number level；
It is provided with reference level Lower Threshold and reference level Upper threshold, described benchmark is more single in described benchmark comparing unit
First level being used for according to described rf digital signal, described reference level Lower Threshold and described reference level Upper threshold, generate
Control voltage corresponding to the level of described rf digital signal；Described control voltage is used for adjusting declining of described controllable attenuator
Subtract coefficient, or for adjusting the amplification coefficient of described controllable amplifier；
Described control voltage output unit is used for producing described control voltage and exporting；
Described D/A converting unit is used for for described control voltage carrying out digital-to-analogue conversion, obtains analog voltage, and by described mould
Intend voltage output to controllable attenuation/amplifier.
(4) described benchmark comparing unit generates the control voltage of the level corresponding to described rf digital signal, concrete bag
Include：
If the level of described rf digital signal is more than described reference level Upper threshold, described benchmark comparing unit generates
Control voltage be input to controllable attenuator, for adjusting the attenuation quotient of described controllable attenuator；
If the level of described rf digital signal is less than described reference level Lower Threshold, described benchmark comparing unit generates
Control voltage be input to controllable amplifier, for adjusting the amplification coefficient of described controllable amplifier.
(5) described amplitude detection module is used for receiving the digital down converted signal of described down coversion filter unit output, makees
For inputting the audio signal of described amplitude detection module；And calculate the average amplitude of described audio signal；
It is provided with standard amplitude, described standard value comparison module is used for calculating described standard in described standard value comparison module
Amplitude and the ratio of described average amplitude；Described standard amplitude is the maximum amplitude of described audio signal；
Described signal adjusting module is used for the ratio according to described standard amplitude and described average amplitude, and described audio frequency is believed
The amplitude of number each sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；Described signal adjusting module obtains
To after the digital audio and video signals with standard amplitude, it is additionally operable to the center of the described digital audio and video signals with standard amplitude
Amplitude is adjusted to and meets the digital audio and video signals that described D/A modular converter inputs demand.
Described D/A modular converter is used for for described digital audio and video signals carrying out digital-to-analogue conversion, obtains simulated audio signal；
Described analog signal output module is used for for described simulated audio signal carrying out output to earphone.
Technical scheme two：
A kind of short-wave signal amplitude automatic adjusting method, is applied to technical scheme and is automatically adjusted with described short-wave signal amplitude
Engagement positions, methods described comprises the steps：
Step 1, controllable attenuation/amplifier is decayed to the radiofrequency signal receiving or is amplified, and will decay or
Signal output after amplification is to A/D converting unit；
Step 2, described A/D converting unit carries out analog digital conversion to the signal after the decay receiving or amplification, obtains
Rf digital signal；The rf digital signal that described down coversion filter unit exports to described A/D converting unit carries out down coversion,
Obtain digital down converted signal；
Step 3, digital signal processor receives described digital down converted signal, and is produced according to described digital down converted signal
Raw control voltage, described control voltage is used for adjusting the attenuation quotient of described controllable attenuator, or is used for adjusting described controlled
The amplification coefficient of amplifier；
Step 4, described audio signal adjust automatically unit receives described digital down converted signal, to described Digital Down Convert
Signal is adjusted, and the simulated audio signal after adjustment is exported.
The feature of technical scheme two and being further improved to：
(1) described step 3 specifically includes following steps：
(3a) energy detection unit receives described digital down converted signal, calculates the average energy of described digital down converted signal
Amount, and using the average energy of described digital down converted signal as rf digital signal level；
(3b) it is provided with reference level Lower Threshold and reference level Upper threshold in benchmark comparing unit, described benchmark is more single
Unit, according to the level of described rf digital signal, described reference level Lower Threshold and described reference level Upper threshold, generates and corresponds to
Control voltage in the level of described rf digital signal；Described control voltage is used for adjusting the decay system of described controllable attenuator
Number, or for adjusting the amplification coefficient of described controllable amplifier；
(3c) control voltage output unit produces described control voltage and exports；
(3d) described control voltage is carried out digital-to-analogue conversion by D/A converting unit, obtains analog voltage, and will be electric for described simulation
Controllable attenuation/amplifier is arrived in pressure output.
(2) in sub-step (3b), the level belonging to level of the rf digital signal that is stored with described benchmark comparing unit
The value of the corresponding control voltage of scope.
(3) described step 4 specifically includes following steps：
(4a) amplitude detection module receives the digital down converted signal of described down coversion filter unit output, as input institute
State the audio signal of amplitude detection module；And calculate the average amplitude of described audio signal；
(4b) it is provided with standard amplitude in standard value comparison module, described standard value comparison module calculates described standard amplitude
Ratio with described average amplitude；Described standard amplitude is the maximum amplitude of described audio signal；
(4c) signal adjusting module, will be each for described audio signal according to the ratio of described standard amplitude and described average amplitude
The amplitude of individual sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；And by described, there is standard amplitude
The center amplitude of digital audio and video signals is adjusted to and meets the digital audio and video signals that described D/A modular converter inputs demand；
(4d) described digital audio and video signals are carried out digital-to-analogue conversion by D/A modular converter, obtain simulated audio signal；Simulation letter
Described simulated audio signal is carried out output and arrives earphone by number output module.
The present invention proposes a kind of short-wave signal amplitude automatic regulating apparatus and method, using Digital Signal Processing,
By, being unlikely to so that output signal keeps suitable level to the two-stage adjust automatically of radiofrequency signal and audio signal because
Input signal too little and cannot normal work, be also unlikely to make receiver that saturation or blocking occur because input signal is too big；
Improve the quality of reception of signal and the comfortableness of staff, have also been enlarged the dynamic range of receiving of receiver.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of short-wave signal amplitude automatic regulating apparatus provided in an embodiment of the present invention；
Fig. 2 is the internal structure schematic diagram of digital signal processor provided in an embodiment of the present invention；
Fig. 3 is the internal structure schematic diagram of audio signal adjust automatically unit provided in an embodiment of the present invention；
Fig. 4 is the schematic flow sheet of short-wave signal amplitude automatic adjusting method provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
The embodiment of the present invention provides a kind of short-wave signal amplitude automatic regulating apparatus, and described short-wave signal comes from radio frequency sky
Line signal output part, 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；
Described radio frequency antenna signal outfan is connected with the signal input part of controllable attenuation/amplifier, and described controllable attenuation/
The signal output part of amplifier is connected with the signal input part of A/D converting unit, the signal output part of described A/D converting unit with
The signal input part of down coversion filter unit connects, the signal output part of described down coversion filter unit respectively with digital signal at
The signal input part of reason device, the signal input part of described audio signal adjust automatically unit connect, described digital signal processor
Signal output part be connected with the control end of controllable attenuation/amplifier；
Described digital signal processor forms a closed loop negative feedback system with described controllable attenuation/amplifier.This part
The amplitude of radiofrequency signal is adjusted, prevents the peak-to-peak value inputting the radiofrequency signal of A/D converting unit from exceeding A/D sampling
Effective range, and make signal held stationary.
Further, as shown in Fig. 2 being provided with described digital signal processor：Energy detection unit, benchmark are more single
Unit, control voltage output unit and D/A converting unit；
The described signal output part of down coversion filter unit is connected with the signal input part of energy detection unit, described energy
The signal output part of detector unit is connected with the signal input part of benchmark comparing unit, the signal output of described benchmark comparing unit
End is connected with the signal input part of control voltage output unit, and the signal output part of described control voltage output unit is turned with D/A
The signal input part changing unit connects, and the signal output part of described D/A converting unit is connected with the control end of controllable attenuation/amplifier
Connect.
Specifically, described controllable attenuation/amplifier comprises controllable attenuator and controllable amplifier；
Described controllable attenuator is used for according to attenuation quotient, the radiofrequency signal receiving being decayed；Described controlled amplification
Device is used for according to amplification coefficient, the radiofrequency signal receiving being amplified；Follow-up radiofrequency signal is made to be limited to having of A/D sampling
It is easy to follow-up signal in the range of effect to process.
In the embodiment of the present invention, controllable attenuation/amplifier is using decay amplification circuit module.Radiofrequency signal input is advanced to decline
Subtract device, laggard amplifier.
When control voltage exports attenuator, attenuator enters working condition.Attenuator mainly resists the input of big signal,
Radiofrequency signal is decayed so as to be entered within the virtual value of AD.The attenuation range of attenuator is 10-20dB, by controlling
Controlling the attenuation degree to signal for the attenuator, Vj is bigger for the size of voltage Vj, and decay is bigger.
When control voltage exports amplifier, amplifier enters working condition, and amplifier is mainly put to small-signal
Greatly so as to sample beneficial to AD.The maximum gain amplifier of amplifier is 25dB, controls amplifier by the size of control voltage Vf
Magnification level to signal, Vf is bigger, and gain amplifier is bigger.
When no control voltage exports, attenuator and amplifier are in channel status, do not carry out pretreatment to signal.
Described A/D converting unit is used for carrying out analog digital conversion to the signal of controllable attenuation/amplifier output, obtains radio frequency number
Word signal；
Described down coversion filter unit is used for carrying out down coversion to the rf digital signal of described A/D converting unit output,
Obtain digital down converted signal；
Described digital signal processor is used for receiving the digital down converted signal of described down coversion filter unit output, and root
Produce control voltage according to described digital down converted signal, described control voltage is used for adjusting the decay system of described controllable attenuator
Number, or for adjusting the amplification coefficient of described controllable amplifier；
Specifically, described energy detection unit is used for receiving the Digital Down Convert letter of described down coversion filter unit output
Number, calculate the average energy of described digital down converted signal, and using the average energy of described digital down converted signal as radio frequency
The level of digital signal；
Exemplary, the average energy of currently up-to-date 100 sampled points can be calculated using the method moving in and out, by it
Level as digital radio signal.
It is provided with reference level Lower Threshold and reference level Upper threshold, described benchmark is more single in described benchmark comparing unit
First level being used for according to described rf digital signal, described reference level Lower Threshold and described reference level Upper threshold, generate
Control voltage corresponding to the level of described rf digital signal；Described control voltage is used for adjusting declining of described controllable attenuator
Subtract coefficient, or for adjusting the amplification coefficient of described controllable amplifier；
It should be noted that reference level is the expectation amplitude value of the level to digital radio signal for the receiver it is desirable to control
Incoming signal level processed fluctuates in the range of this reference level, and reference level is limited within the active voltage allowed band of A/D.
When digital radio signal level Vd is less than reference level Lower Threshold Vx, produce the control voltage amplified for signal
Vf, and Contemporary Digital level of RF signals Vd is less, and bigger with the difference of reference level Lower Threshold Vx, then control voltage Vf is got over
Greatly；
When digital radio signal level Vd is more than reference level Upper threshold Vs, produce the control voltage for signal attenuation
Vj, and Contemporary Digital level of RF signals Vd is bigger, and bigger with the difference of reference level Upper threshold Vs, then control voltage Vj is got over
Greatly；
When input digital radio signal level is between two thresholdings of reference level, do not produce control voltage.
Described control voltage output unit is used for producing described control voltage and exporting；
Described D/A converting unit is used for for described control voltage carrying out digital-to-analogue conversion, obtains analog voltage, and by described mould
Intend voltage output to controllable attenuation/amplifier.
You need to add is that, when not producing control voltage, D/A converting unit does not carry out voltage output.Control voltage
By the way of timing output, by DSP CONTROL D/A converting unit timing output.
It should be noted that described benchmark comparing unit generates the control electricity of the level corresponding to described rf digital signal
Pressure, specifically includes：
If the level of described rf digital signal is more than described reference level Upper threshold, described benchmark comparing unit generates
Control voltage be input to controllable attenuator, for adjusting the attenuation quotient of described controllable attenuator；
If the level of described rf digital signal is less than described reference level Lower Threshold, described benchmark comparing unit generates
Control voltage be input to controllable amplifier, for adjusting the amplification coefficient of described controllable amplifier.
Because delayed and adjustment the precision of the amplitude adjustment to radiofrequency signal for the digital signal processor is not high enough, audio frequency is believed
Number excursion still can not meet requirement, 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 simulated audio signal of final output to earphone can reach
Within 3dB.
Described audio signal adjust automatically unit is used for receiving the Digital Down Convert letter of described down coversion filter unit output
Number, and the digital down converted signal of described down coversion filter unit output is adjusted, and the analogue audio frequency after adjustment is believed
Number export earphone.
Further, as shown in figure 3, being provided with described audio signal adjust automatically unit：Amplitude detection module, mark
Quasi- value comparison module, signal adjusting module, D/A modular converter and analog signal output module；
The signal output part of described down coversion filter unit is connected with the signal input part of amplitude detection module, described amplitude
The signal output part of detection module is connected with the signal input part of standard value comparison module, the signal of described standard value comparison module
Outfan is connected with the signal input part of signal adjusting module, the signal output part of described signal adjusting module and D/A modulus of conversion
The signal input part of block connects, and the signal output part of described D/A modular converter is connected with the input of analog signal output module.
Specifically, described amplitude detection module is used for receiving the Digital Down Convert letter of described down coversion filter unit output
Number, as the audio signal inputting described amplitude detection module；And calculate the average amplitude of described audio signal；
Exemplary, the average amplitude of currently up-to-date 50 audio sample points is calculated using the method moving in and out.
It is provided with standard amplitude, described standard value comparison module is used for calculating described standard in described standard value comparison module
Amplitude and the ratio of described average amplitude；Described standard amplitude is the maximum amplitude of described audio signal；
It should be noted that arithmetic standard amplitude can also suitably choose the value more than arithmetic maximum amplitude.
Described signal adjusting module is used for the ratio according to described standard amplitude and described average amplitude, and described audio frequency is believed
The amplitude of number each sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；Described signal adjusting module obtains
To after the digital audio and video signals with standard amplitude, it is additionally operable to the center of the described digital audio and video signals with standard amplitude
Amplitude is adjusted to and meets the digital audio and video signals that described D/A modular converter inputs demand.
Described D/A modular converter is used for for described digital audio and video signals carrying out digital-to-analogue conversion, obtains simulated audio signal；
Described analog signal output module is used for for described simulated audio signal carrying out output to earphone.
The embodiment of the present invention also provides a kind of short-wave signal amplitude automatic adjusting method, is applied to described in above-described embodiment
Short-wave signal amplitude automatic regulating apparatus, as shown in figure 4, methods described comprises the steps：
Step 1, controllable attenuation/amplifier is decayed to the radiofrequency signal receiving or is amplified, and will decay or
Signal output after amplification is to A/D converting unit；
Step 2, described A/D converting unit carries out analog digital conversion to the signal after the decay receiving or amplification, obtains
Rf digital signal；The rf digital signal that described down coversion filter unit exports to described A/D converting unit carries out down coversion,
Obtain digital down converted signal；
Step 3, digital signal processor receives described digital down converted signal, and is produced according to described digital down converted signal
Raw control voltage, described control voltage is used for adjusting the attenuation quotient of described controllable attenuator, or is used for adjusting described controlled
The amplification coefficient of amplifier；
Described step 3 specifically includes following steps：
(3a) energy detection unit receives described digital down converted signal, calculates the average energy of described digital down converted signal
Amount, and using the average energy of described digital down converted signal as rf digital signal level；
(3b) it is provided with reference level Lower Threshold and reference level Upper threshold in benchmark comparing unit, described benchmark is more single
Unit, according to the level of described rf digital signal, described reference level Lower Threshold and described reference level Upper threshold, generates and corresponds to
Control voltage in the level of described rf digital signal；Described control voltage is used for adjusting the decay system of described controllable attenuator
Number, or for adjusting the amplification coefficient of described controllable amplifier；
Be stored with described benchmark comparing unit rf digital signal the level range belonging to level corresponding control electricity
The value of pressure.
(3c) control voltage output unit produces described control voltage and exports；
(3d) described control voltage is carried out digital-to-analogue conversion by D/A converting unit, obtains analog voltage, and will be electric for described simulation
Controllable attenuation/amplifier is arrived in pressure output.
Step 4, described audio signal adjust automatically unit receives described digital down converted signal, to described Digital Down Convert
Signal is adjusted, and the simulated audio signal after adjustment is exported.
Described step 4 specifically includes following steps：
(4a) amplitude detection module receives the digital down converted signal of described down coversion filter unit output, as input institute
State the audio signal of amplitude detection module；And calculate the average amplitude of described audio signal；
(4b) it is provided with standard amplitude in standard value comparison module, described standard value comparison module calculates described standard amplitude
Ratio with described average amplitude；Described standard amplitude is the maximum amplitude of described audio signal；
(4c) signal adjusting module, will be each for described audio signal according to the ratio of described standard amplitude and described average amplitude
The amplitude of individual sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；And by described, there is standard amplitude
The center amplitude of digital audio and video signals is adjusted to and meets the digital audio and video signals that described D/A modular converter inputs demand；
(4d) described digital audio and video signals are carried out digital-to-analogue conversion by D/A modular converter, obtain simulated audio signal；Simulation letter
Described simulated audio signal is carried out output and arrives earphone by number output module.
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
When signal excursion is within -107dbm～10dbm, through signal amplitude two-stage adjust automatically it is ensured that output
Audio frequency signal amplitude excursion is within 3db it is ensured that communication quality；By automatically being decayed to radiofrequency signal or being put
Greatly, expand the range of receiving of receiver；The major function of adjust automatically is realized on digital signal processor, improves receiver
Work efficiency, reduce implementation complexity, be easy to the lifting of follow-up function and perfect.
One of ordinary skill in the art will appreciate that：The all or part of step realizing said method embodiment can be passed through
Completing, aforesaid program can be stored in computer read/write memory medium the related hardware of programmed instruction, and this program exists
During execution, execute the step including said method embodiment；And aforesaid storage medium includes：ROM, RAM, magnetic disc or CD
Etc. various can be with the medium of store program codes.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, all should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by described scope of the claims.
Claims (10)
1. a kind of short-wave signal amplitude automatic regulating apparatus, described short-wave signal comes from radio frequency antenna signal outfan, and it is special
Levy and be,
Described device includes：Controllable attenuation/amplifier, A/D converting unit, down coversion filter unit, digital signal processor, sound
Frequency signal adjust automatically unit；
Described radio frequency antenna signal outfan is connected with the signal input part of controllable attenuation/amplifier, described controllable attenuation/amplification
The signal output part of device is connected with the signal input part of A/D converting unit, the signal output part of described A/D converting unit and lower change
The signal input part of frequency filter unit connects, the signal output part of described down coversion filter unit respectively with digital signal processor
Signal input part, described audio signal adjust automatically unit signal input part connect, the letter of described digital signal processor
Number outfan is connected with the control end of controllable attenuation/amplifier；
It is provided with described digital signal processor：Energy detection unit, benchmark comparing unit, control voltage output unit and D/
A converting unit；
The described signal output part of down coversion filter unit is connected with the signal input part of energy detection unit, described energy measuring
The signal output part of unit is connected with the signal input part of benchmark comparing unit, the signal output part of described benchmark comparing unit with
The signal input part of control voltage output unit connects, and the signal output part of described control voltage output unit is single with D/A conversion
The signal input part of unit connects, and the signal output part of described D/A converting unit is connected with the control end of controllable attenuation/amplifier.
2. a kind of short-wave signal amplitude automatic regulating apparatus according to claim 1 is it is characterised in that described audio signal
It is provided with adjust automatically unit：Amplitude detection module, standard value comparison module, signal adjusting module, D/A modular converter and
Analog signal output module；
The signal output part of described down coversion filter unit is connected with the signal input part of amplitude detection module, described amplitude detection
The signal output part of module is connected with the signal input part of standard value comparison module, the signal output of described standard value comparison module
End is connected with the signal input part of signal adjusting module, the signal output part of described signal adjusting module and D/A modular converter
Signal input part connects, and the signal output part of described D/A modular converter is connected with the input of analog signal output module.
3. a kind of short-wave signal amplitude automatic regulating apparatus according to claim 1 is it is characterised in that described controlled decline
Subtract/amplifier comprises controllable attenuator and controllable amplifier；
Described controllable attenuator is used for according to attenuation quotient, the radiofrequency signal receiving being decayed；
Described controllable amplifier is used for according to amplification coefficient, the radiofrequency signal receiving being amplified；
Described A/D converting unit is used for carrying out analog digital conversion to the signal of controllable attenuation/amplifier output, obtains RF digital letter
Number；
Described down coversion filter unit is used for carrying out down coversion to the rf digital signal of described A/D converting unit output, obtains
Digital down converted signal；
Described digital signal processor is used for receiving the digital down converted signal of described down coversion filter unit output, and according to institute
State digital down converted signal and produce control voltage, described control voltage is used for adjusting the attenuation quotient of described controllable attenuator, or
Person is used for adjusting the amplification coefficient of described controllable amplifier；
Described audio signal adjust automatically unit is used for receiving the digital down converted signal of described down coversion filter unit output, and
The digital down converted signal of described down coversion filter unit output is adjusted, and the simulated audio signal after adjustment is exported
To earphone.
4. a kind of short-wave signal amplitude automatic regulating apparatus according to claim 1 or 3 it is characterised in that
Described energy detection unit is used for receiving the digital down converted signal of described down coversion filter unit output, calculates described number
The average energy of word down-conversion signal, and using the average energy of described digital down converted signal as rf digital signal electricity
Flat；
It is provided with reference level Lower Threshold and reference level Upper threshold, described benchmark comparing unit is used in described benchmark comparing unit
In the level according to described rf digital signal, described reference level Lower Threshold and described reference level Upper threshold, generate and correspond to
Control voltage in the level of described rf digital signal；Described control voltage is used for adjusting the decay system of described controllable attenuator
Number, or for adjusting the amplification coefficient of described controllable amplifier；
Described control voltage output unit is used for producing described control voltage and exporting；
Described D/A converting unit is used for for described control voltage carrying out digital-to-analogue conversion, obtains analog voltage, and will be electric for described simulation
Controllable attenuation/amplifier is arrived in pressure output.
5. a kind of short-wave signal amplitude automatic regulating apparatus according to claim 4 is it is characterised in that described benchmark compares
Unit generates the control voltage of the level corresponding to described rf digital signal, specifically includes：
If the level of described rf digital signal is more than described reference level Upper threshold, the control that described benchmark comparing unit generates
Control source processed to controllable attenuator, for adjusting the attenuation quotient of described controllable attenuator；
If the level of described rf digital signal is less than described reference level Lower Threshold, the control that described benchmark comparing unit generates
Control source processed to controllable amplifier, for adjusting the amplification coefficient of described controllable amplifier.
6. a kind of short-wave signal amplitude automatic regulating apparatus according to claim 2 it is characterised in that
Described amplitude detection module is used for receiving the digital down converted signal of described down coversion filter unit output, as input institute
State the audio signal of amplitude detection module；And calculate the average amplitude of described audio signal；
It is provided with standard amplitude, described standard value comparison module is used for calculating described standard amplitude in described standard value comparison module
Ratio with described average amplitude；Described standard amplitude is the maximum amplitude of described audio signal；
Described signal adjusting module is used for the ratio according to described standard amplitude and described average amplitude, will be each for described audio signal
The amplitude of individual sampled point is adjusted, and obtains the digital audio and video signals with standard amplitude；Described signal adjusting module is had
After having the digital audio and video signals of standard amplitude, it is additionally operable to the center amplitude of the described digital audio and video signals with standard amplitude
It is adjusted to and meet the digital audio and video signals that described D/A modular converter inputs demand.
Described D/A modular converter is used for for described digital audio and video signals carrying out digital-to-analogue conversion, obtains simulated audio signal；
Described analog signal output module is used for for described simulated audio signal carrying out output to earphone.
7. a kind of short-wave signal amplitude automatic adjusting method, is applied to the short-wave signal width as described in any one of claim 1-7
Degree automatic regulating apparatus is it is characterised in that methods described comprises the steps：
Step 1, controllable attenuation/amplifier is decayed to the radiofrequency signal receiving or is amplified, and will decay or amplify
Signal output afterwards is to A/D converting unit；
Step 2, described A/D converting unit carries out analog digital conversion to the signal after the decay receiving or amplification, obtains radio frequency
Digital signal；The rf digital signal that described down coversion filter unit exports to described A/D converting unit carries out down coversion, obtains
Digital down converted signal；
Step 3, digital signal processor receives described digital down converted signal, and produces control according to described digital down converted signal
Voltage processed, described control voltage is used for adjusting the attenuation quotient of described controllable attenuator, or is used for adjusting described controlled amplification
The amplification coefficient of device；
Step 4, described audio signal adjust automatically unit receives described digital down converted signal, to described digital down converted signal
It is adjusted, and the simulated audio signal after adjustment is exported.
8. a kind of short-wave signal amplitude automatic adjusting method according to claim 7 is it is characterised in that described step 3 has
Body comprises the steps：
(3a) energy detection unit receives described digital down converted signal, calculates the average energy of described digital down converted signal,
And using the average energy of described digital down converted signal as rf digital signal level；
(3b) it is provided with reference level Lower Threshold and reference level Upper threshold, described benchmark comparing unit root in benchmark comparing unit
According to the level of described rf digital signal, described reference level Lower Threshold and described reference level Upper threshold, generate corresponding to institute
State the control voltage of the level of rf digital signal；Described control voltage is used for adjusting the attenuation quotient of described controllable attenuator,
Or for adjusting the amplification coefficient of described controllable amplifier；
(3c) control voltage output unit produces described control voltage and exports；
(3d) described control voltage is carried out digital-to-analogue conversion by D/A converting unit, obtains analog voltage, and will be defeated for described analog voltage
Go out to controllable attenuation/amplifier.
9. a kind of short-wave signal amplitude automatic adjusting method according to claim 8 is it is characterised in that sub-step (3b)
In, the corresponding control voltage of the level range belonging to level of the rf digital signal that is stored with described benchmark comparing unit
Value.
10. a kind of short-wave signal amplitude automatic adjusting method according to claim 7 is it is characterised in that described step 4 has
Body comprises the steps：
(4a) amplitude detection module receives the digital down converted signal of described down coversion filter unit output, as the described width of input
The audio signal of value detection module；And calculate the average amplitude of described audio signal；
(4b) it is provided with standard amplitude in standard value comparison module, described standard value comparison module calculates described standard amplitude and institute
State the ratio of average amplitude；Described standard amplitude is the maximum amplitude of described audio signal；
(4c) according to the ratio of described standard amplitude and described average amplitude, by described audio signal, each adopts signal adjusting module
The amplitude of sampling point is adjusted, and obtains the digital audio and video signals with standard amplitude；And by the described numeral with standard amplitude
The center amplitude of audio signal is adjusted to and meets the digital audio and video signals that described D/A modular converter inputs demand；
(4d) described digital audio and video signals are carried out digital-to-analogue conversion by D/A modular converter, obtain simulated audio signal；Analogue signal is defeated
Go out module and described simulated audio signal is carried out output to earphone.
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