CN109462798A - A kind of chauvent's criterion audio-frequency power amplifier and method - Google Patents
A kind of chauvent's criterion audio-frequency power amplifier and method Download PDFInfo
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- CN109462798A CN109462798A CN201811336545.4A CN201811336545A CN109462798A CN 109462798 A CN109462798 A CN 109462798A CN 201811336545 A CN201811336545 A CN 201811336545A CN 109462798 A CN109462798 A CN 109462798A
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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
Abstract
The invention discloses a kind of chauvent's criterion audio-frequency power amplifiers, comprising: pickup circuit is coupled to external microphone；Power amplification circuit is coupled to pickup circuit, is further coupled to external loudspeaker；Display circuit, the display circuit are coupled with utter long and high-pitched sounds frequency detection circuit and power calculation circuit, and the frequency detection circuit of uttering long and high-pitched sounds is coupled to pickup circuit, and the power calculation circuit is coupled to power amplifier；Power circuit.Chauvent's criterion audio-frequency power amplifier of the invention, pass through the setting of pickup circuit, the electric signal of external microphone output can effectively be picked up, it so can effectively pick up the electric signal of external microphone output, then pass through the setting of power amplification circuit, effectively electric signal is amplified out, it is made a sound for external loudspeaker, then frequency and power are shown by display circuit, so the position of external microphone can be adjusted by checking frequency and power, to effectively inhibit to utter long and high-pitched sounds.
Description
Technical field
The present invention relates to a kind of suppression circuit, more particularly to a kind of chauvent's criterion audio-frequency power amplifier and side
Method.
Background technique
Currently, arenas, conference hall, stadiums and gymnasiums, the Room OK a karaoke club 0K etc., various types of sound reinforcement systems are all generally existing
It utters long and high-pitched sounds phenomenon, usually while the volume of microphone is carried out biggish promotion, the sound that speaker issues is passed to microphone and draws
It rises and utters long and high-pitched sounds.The presence uttered long and high-pitched sounds has not only broken up sound quality, has limited the volume of microphone, and the sound for picking up microphone is from good
Ground reproduces, and uttering long and high-pitched sounds for depth can also make system signal too strong and burn power amplifier or speaker, especially burn the high pitch of speaker
Loudspeaker.
The generation uttered long and high-pitched sounds nearly all is caused by occurring higher positive feedback as audio signal.The sound of loudspeaker is rolled over
Microphone is returned to, the signal of microphone output is then sent through sound reinforcement system and amplifies and send out again through loudspeaker, then goes back to biography again
Sound device, so caused by circulation.Cause feedback signal be usually a single-frequency signals, by several times repeatedly after, same-phase
Superposition incrementally increases, to form self-oscillation, the height of self-excited oscillatory frequency is embodied in the height for the pitch frequency uttered long and high-pitched sounds.
And the method that existing most common inhibition is uttered long and high-pitched sounds is exactly to pass through hand by microphone movement, is changed between microphone and sound source
Distance, to avoid the occurrence of microphone on the position uttered long and high-pitched sounds a little, so that the problem of speaker is uttered long and high-pitched sounds, however due to above-mentioned suppression
During system, the position uttered long and high-pitched sounds a little be it is very indefinite, people are merely able to that microphone is avoided not utter long and high-pitched sounds a little by feeling
Position, will so cause inhibit utter long and high-pitched sounds during, people need constantly by movement looks for uttering long and high-pitched sounds a little so that suppression
Making the efficiency uttered long and high-pitched sounds becomes very low.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of chauvent's criterion high-efficient suppression of uttering long and high-pitched sounds
Audio-frequency power amplifier processed and method.
To achieve the above object, the present invention provides the following technical scheme that a kind of chauvent's criterion audio-frequency power amplifier, packet
It includes:
Pickup circuit, is coupled to external microphone, the voice electricity after sound conversion for receiving external microphone output
Signal, and exported after converting；
Power amplification circuit is coupled to pickup circuit, is further coupled to external loudspeaker, for receiving pickup circuit output
Voice telecommunication number, and will be output in external loudspeaker after the amplification of this voice telecommunication number, drive external loudspeaker sounding；
Display circuit, the display circuit are coupled with utter long and high-pitched sounds frequency detection circuit and power calculation circuit, the frequency of uttering long and high-pitched sounds
Detection circuit is coupled to pickup circuit, the frequency of uttering long and high-pitched sounds in voice telecommunication number for detecting pickup circuit output, and is input to
It is shown in display circuit, the power calculation circuit is coupled to power amplifier, for receiving amplified voice telecommunication
Number, and calculate and shown in the power input to display circuit of the voice telecommunication number；
Power circuit is coupled to external alternating current, for output after mains supply is converted into power supply to pickup circuit, power
Amplifying circuit, display circuit, utter long and high-pitched sounds frequency detection circuit and power calculation circuit power supply.
As a further improvement of the present invention, chauvent's criterion has been also coupled between the pickup circuit and power amplification circuit
Circuit, for being input to power amplification electricity after the voice telecommunication number inhibition in pickup circuit output to power amplification circuit is uttered long and high-pitched sounds
In road.
As a further improvement of the present invention, conversion electricity is coupled between the power calculation circuit and power amplification circuit
Road, the conversion circuit include:
Rectification circuit is coupled to power amplification circuit, the amplification voice telecommunication number for exporting power amplification circuit into
It is exported after row rectification；
Filter circuit is coupled to rectification circuit, is filtered for the voice telecommunication number after the rectification to output；
A/D conversion circuit, is coupled to filter circuit, is further coupled to power calculation circuit, for the telecommunications after accepting filter
Number, and be converted into digital signal and be input in power calculation circuit.
As a further improvement of the present invention, the pickup circuit includes:
Operational amplifier U1A, the inverting input terminal of operational amplifier U1A is coupled with after resistance R4 be coupled with capacitor C3 after
It is coupled to external microphone, capacitor C3 has been also coupled to resistance R3 and has been followed by power supply, the non-inverting input terminal of the operational amplifier U1A
It is grounded after being coupled with resistance R7 and resistance R9, has been also coupled to resistance R6 and has been followed by power supply, the output end coupling of the operational amplifier U1A
It is connected to the inverting input terminal that operational amplifier U1A is coupled after capacitor C1 and resistance R1 parallel with one another；
Operational amplifier U1B, the inverting input terminal of operational amplifier U1B are coupled to operation after being coupled with variable resistance R5
The output end of amplifier U1A, the non-inverting input terminal of the operational amplifier U1B are coupled to the one of resistance R7 after being coupled with resistance R8
End, the output end of operational amplifier U1B are coupled to operational amplifier U1B after being coupled with capacitor C2 and resistance R2 parallel with one another
Inverting input terminal, be also coupled to capacitor C4 and be coupled to power amplification circuit.
As a further improvement of the present invention, the chauvent's criterion circuit includes:
Operational amplifier U2, the inverting input terminal of operational amplifier U2 are coupled to pickup after being coupled with thermo-sensitive resistor RW1
Circuit is grounded after being also coupled to capacitor C100, non-inverting input terminal be coupled to resistance R100 be coupled to thermo-sensitive resistor RW1 relative to
One end of pickup circuit, the output end of operational amplifier U2 are coupled to resistance R100 relative to pickup after being coupled with resistance R101
The other end of circuit, the output end are further coupled to power amplification circuit.As a further improvement of the present invention, the frequency of uttering long and high-pitched sounds
Detection circuit includes:
Light coupling relay U3, the light coupling relay U3 have input circuit and output loop, and the input circuit includes
First input end and the second input terminal, the output loop include the first output end and second output terminal, the first input end
It is coupled with after variable resistance R36 after being coupled with resistance R31 and is coupled to pickup circuit, second input end grounding, described first
Output end is coupled to power supply, and second output terminal is grounded after being coupled with variable resistance R37, has been also coupled to be coupled to after resistance R34 aobvious
Show circuit.
It as a further improvement of the present invention, further include chauvent's criterion device, the chauvent's criterion device includes shell and setting
Sound channel inside the shell and it is arranged in sound channel to the cutting device for being truncated or opening sound channel, it is external
Loudspeaker is arranged in sound channel, and the cutting device includes soundproof plate and driving motor, the conduit wall of the sound channel
On offer storage groove, the setting of the soundproof plate slip can slide into storage groove and open sound channel in storage groove,
Or truncation sound channel is skidded off out of storage groove, the driving motor and frequency detection circuit coupling of uttering long and high-pitched sounds are uttered long and high-pitched sounds with receiving
The frequency signal of uttering long and high-pitched sounds of frequency detection circuit output, and as signal rotates, it is coaxially fixed in the shaft of the driving motor
Screw rod, the driving motor are fixed on the slot bottom of storage groove, and notch of the screw rod from driving motor towards storage groove extends, the sound insulation
It is fixedly connected with slipping block on plate, the screw rod is penetrated into slipping block and is threadedly coupled with slipping block to drive soundproof plate from depositing
It puts and skids off or slid into storage groove in slot.
Another aspect of the present invention additionally provides a kind of method for inhibiting to utter long and high-pitched sounds using above-mentioned audio-frequency amplifier, including walks as follows
It is rapid:
Step 1 is picked up the electric signal exported after external microphone converts the sound into using pickup circuit, passes through howl later
It is frequency of uttering long and high-pitched sounds in frequency detection circuit detection electric signal, and is input in display circuit and shows；
Step 2 is input to external loudspeaking after amplifying the electric signal of pickup circuit output using power amplification circuit
It is played back in device, while calculating the output power of the amplified electric signal of power amplification circuit using power calculation circuit, and
It is input in display circuit and shows；
Step 3, utter long and high-pitched sounds frequency and the output power adjustment external microphone and speaker shown according to display circuit
Relative position, wherein specific set-up procedure is first to move external microphone position, display circuit display orientation arrow when providing
Head, if after external microphone is mobile, frequency of uttering long and high-pitched sounds is reduced, then display circuit shows orientation identical with original moving direction arrow
Head, if uttering long and high-pitched sounds frequency increase, then display circuit shows the direction arrow opposite with original moving direction.
As the further improvement of the above method, frequency detection circuit detection frequency of uttering long and high-pitched sounds is utilized in the step 1
Steps are as follows:
Step 1 one, judges whether the frequency size detected is less than 2000HZ, if so, calculating howl using cycle test method
It is frequency, if it is not, then calculating frequency of uttering long and high-pitched sounds using Measuring Frequency Method.
It is described Step 1: display circuit display frequency and power in step 2 as the further improvement of the above method
The step of it is as follows:
Step 1, variable assignments is shown using display circuit, then coordinate the first row is set, show voltage measurement word later
The second row of coordinate is arranged in symbol, shows voltage value, and coordinate the third line is arranged, and shows power measurement character；Fourth line is arranged to sit
Mark shows performance number；
Step 2, the performance number that step 1 is shown is subjected to clear screen after delay is shown, then the first row coordinate is set, later
Display frequency measures character, and the second row coordinate, display frequency numerical value is arranged；
Step 3, the frequency values that step 2 is shown are subjected to clear screen after delay is shown, complete step 1 and step 2
The display of frequency and power.
Beneficial effects of the present invention pass through the setting of pickup circuit, so that it may it is defeated effectively to receive external microphone
The electric signal that external sound out converts, is then input in power amplification circuit, is amplified out by power amplification circuit
Come, so realizes the effect of sound power amplification, and by the setting of utter long and high-pitched sounds frequency detection circuit and power calculation circuit,
It can effectively detect the frequency of uttering long and high-pitched sounds of pickup circuit output, and calculate the signal function that power amplifier finally exports
Rate, then by the setting of display circuit, the frequency that will can effectively utter long and high-pitched sounds and signal power are shown, such people
Can according to show utter long and high-pitched sounds frequency and signal power judges whether to generate and utters long and high-pitched sounds, thus there is no need to compared with
It is the same in technology, uttering long and high-pitched sounds a little for speaker is determined by the way of feeling, can will just utter long and high-pitched sounds before generation of uttering long and high-pitched sounds has
The inhibition of effect so greatly improves the inhibition efficiency uttered long and high-pitched sounds, while passing through the setting of step 1 and step 2, can have
The effect using above-mentioned pickup circuit, utter long and high-pitched sounds frequency detection circuit and power calculation circuit of effect, detects frequency of uttering long and high-pitched sounds
With calculate output power, then shown using display circuit, such people can according to show utter long and high-pitched sounds frequency
Rate and output power move the position between microphone and sound source, the generation uttered long and high-pitched sounds so effectively are avoided, compared to existing skill
Method in art is just found and is uttered long and high-pitched sounds a little by feeling after producing and uttering long and high-pitched sounds, can utter long and high-pitched sounds generate before just to uttering long and high-pitched sounds
Inhibited, so greatly increases the inhibition efficiency uttered long and high-pitched sounds.
Detailed description of the invention
Fig. 1 is the module frame chart of chauvent's criterion audio-frequency power amplifier of the invention；
Fig. 2 is the circuit diagram of pickup circuit in Fig. 1；
Fig. 3 is the circuit diagram of chauvent's criterion circuit in Fig. 1；
Fig. 4 is the circuit diagram of frequency detection circuit of uttering long and high-pitched sounds in Fig. 1；
Fig. 5 is the circuit diagram of power circuit；
Fig. 6 is the flow chart of the detection frequency of chauvent's criterion method of the invention；
Fig. 7 is the flow chart of the display frequency and power of chauvent's criterion method of the invention；
Fig. 8 is the overall structure figure of chauvent's criterion device.
Specific embodiment
The present invention is described in further detail below in conjunction with embodiment given by attached drawing.
Shown in 8, a kind of chauvent's criterion audio-frequency power amplifier of the present embodiment, comprising:
Pickup circuit 1, is coupled to external microphone, the voice electricity after sound conversion for receiving external microphone output
Signal, and exported after converting；
Power amplification circuit 2 is coupled to pickup circuit 1, is further coupled to external loudspeaker, defeated for receiving pickup circuit 1
Voice telecommunication number out, and will be output in external loudspeaker after the amplification of this voice telecommunication number, drive external loudspeaker sounding；
Display circuit 3, which is coupled with utter long and high-pitched sounds frequency detection circuit 4 and power calculation circuit 5, described to utter long and high-pitched sounds
Frequency detection circuit 4 is coupled to pickup circuit 1, the frequency of uttering long and high-pitched sounds in voice telecommunication number for detecting the output of pickup circuit 1, and
It is input in display circuit 3 and shows, the power calculation circuit 5 is coupled to power amplifier 2, amplified for receiving
Voice telecommunication number, and calculate and shown in the power input to display circuit 3 of the voice telecommunication number；
Power circuit 6 is coupled to external alternating current, for output after mains supply is converted into power supply to pickup circuit 1, function
Rate amplifying circuit 2, display circuit 3, utter long and high-pitched sounds frequency detection circuit 4 and the power supply of power calculation circuit 5, in the sound using the present embodiment
During frequency power amplifier, it is only necessary to audio-frequency power amplifier is connected between external microphone and loudspeaker, simultaneously
Power circuit 6 is electrically connected with external city, such audio-frequency power amplifier will work, and pickup circuit 1 picks up external microphone
Then this voice telecommunication number is input in power amplification circuit 2, later power by the voice telecommunication number exported according to sound
Amplifying circuit 2 carries out power amplification for this voice telecommunication number, is input in loudspeaker later, so that loudspeaker plays amplification
Sound afterwards so realizes an effect effectively amplified to sound, and passes through frequency detection circuit 4 and the power meter of uttering long and high-pitched sounds
The setting for calculating circuit 5 can effectively detect the frequency of uttering long and high-pitched sounds for the voice telecommunication number that pickup circuit 1 exports, calculate simultaneously
The amplified output power of power amplification circuit 2 out, then by display circuit 3 effectively by above-mentioned acquisition utter long and high-pitched sounds frequency and
Output power shows, based on generating the principle uttered long and high-pitched sounds in the prior art, frequency of mainly uttering long and high-pitched sounds is more than certain numerical value and defeated
Power is more than that certain numerical value will lead to the generation uttered long and high-pitched sounds, thus the audio-frequency power amplifier of the present embodiment out, can be passed through
Change the distance between microphone and sound source, avoid being moved to that generation utters long and high-pitched sounds utters long and high-pitched sounds the uttering long and high-pitched sounds a little of frequency and output power, so
Chauvent's criterion mode in compared with the prior art is sought there is no need to after waiting and uttering long and high-pitched sounds generation, then by way of feeling
It looks for and uttering long and high-pitched sounds a little, and then realize and inhibit to utter long and high-pitched sounds, so greatly increase the inhibition efficiency uttered long and high-pitched sounds, the display circuit in the present embodiment
3 include intelligent control chip circuit and LCD liquid crystal display, while power calculation circuit 5 is integrated into intelligent control chip circuit
Interior, LCD liquid crystal display is arranged on external microphone, and such people can check the language that pickup circuit 1 exports in real time
The output power of the utter long and high-pitched sounds frequency and power amplification circuit 2 of sound electric signal, greatly facilitates people for the inhibition uttered long and high-pitched sounds,
And pass through the setting of intelligent control chip circuit, the editability of intelligent control chip can be utilized, effective realization power
It calculates and utter long and high-pitched sounds frequency and output power also is realized with regard to display cooperation with LCD.
As a kind of improved specific embodiment, howl has been also coupled between the pickup circuit 1 and power amplification circuit 2
It is suppression circuit 7, the voice telecommunication number inhibition for pickup circuit 1 to be output in power amplification circuit 2 is input to after uttering long and high-pitched sounds
In power amplification circuit 2, by the setting of chauvent's criterion circuit 7, just the voice telecommunication number that pickup circuit 1 exports can be carried out
Chauvent's criterion one step ahead so can further avoid audio-frequency power amplifier from uttering long and high-pitched sounds during audio amplification
The problem of, further improve the chauvent's criterion of audio-frequency amplifier.
As a kind of improved specific embodiment, it is coupled between the power calculation circuit 5 and power amplification circuit 2
Conversion circuit 8, the conversion circuit 8 include:
Rectification circuit 81 is coupled to power amplification circuit 2, the amplification voice telecommunication for exporting power amplification circuit 2
It is exported after number being rectified；
Filter circuit 82 is coupled to rectification circuit 81, is filtered for the voice telecommunication number after the rectification to output；A/
D conversion circuit 83 is coupled to filter circuit 82, is further coupled to power calculation circuit 5, for the electric signal after accepting filter, and
It is converted into digital signal to be input in power calculation circuit 5, because voice signal required for the broadcasting audio of loudspeaker is mould
Quasi- signal, however the signal that intelligent control chip is identified is digital signal, thus in the present embodiment, pass through rectification circuit 81
Setting, the speech waveform signal of simulation is converted into direct current signal, then by the setting of filter circuit 82, is effectively filtered out
Fall the interference noise on voice telecommunication number, interference noise is avoided to calculate the interference of power for intelligent control chip, so that intelligence
There are biggish errors for the output power that is calculated of control chip, and by the setting of A/D 83 circuits of conversion, can will be straight
The voice telecommunication number of stream is converted into digital signal and calculates to intelligent control chip identification, thus compared to the voice electricity that will be simulated
Signal is directly inputted to the mode that intelligent control chip is calculated, and can effectively avoid intelligent control chip identification voice electricity
The problem for the numerical value inaccuracy that output power caused by signal is not comprehensive enough calculates.
As a kind of improved specific embodiment, the pickup circuit 1 includes:
Operational amplifier U1A, the inverting input terminal of operational amplifier U1A is coupled with after resistance R4 be coupled with capacitor C3 after
It is coupled to external microphone, capacitor C3 has been also coupled to resistance R3 and has been followed by power supply, the non-inverting input terminal of the operational amplifier U1A
It is grounded after being coupled with resistance R7 and resistance R9, has been also coupled to resistance R6 and has been followed by power supply, the output end coupling of the operational amplifier U1A
It is connected to the inverting input terminal that operational amplifier U1A is coupled after capacitor C1 and resistance R1 parallel with one another；
Operational amplifier U1B, the inverting input terminal of operational amplifier U1B are coupled to operation after being coupled with variable resistance R5
The output end of amplifier U1A, the non-inverting input terminal of the operational amplifier U1B are coupled to the one of resistance R7 after being coupled with resistance R8
End, the output end of operational amplifier U1B are coupled to operational amplifier U1B after being coupled with capacitor C2 and resistance R2 parallel with one another
Inverting input terminal, be also coupled to capacitor C4 and be coupled to power amplification circuit 2, passed through operational amplifier U1A and operational amplifier
The setting of U1B can effectively form a second amplifying circuit, the voice telecommunication number exported for external microphone into
One preliminary amplification of row, so that the voice telecommunication number of external microphone output can be carried out preferably to power amplification circuit 2
It is exaggerated, and passes through the setting of capacitor C3 and resistance R4, one can be carried out to the voice telecommunication number of external microphone output
The effect of filtering, some interference caused by filtering out during external microphone converts tones into voice telecommunication are humorous
Wave, in voice telecommunication number, distortion rate can be reduced greatly after second level amplification in this way, and by variable resistance R5 and can be changed
The setting of resistance R8 can adjust putting for the combined second amplifying circuit formed of operational amplifier U1A and operational amplifier U1B
Big multiple, so avoid the amplification factor before power amplification circuit 2 it is excessive caused by below by power amplification circuit 2 into
One step is amplified so that output power is excessive, and generates the position uttered long and high-pitched sounds, therefore passes through setting for variable resistance R5 and variable resistance R8
It sets, can realize that amplification early period is sufficiently large, while being unlikely to generate the effect uttered long and high-pitched sounds again.
As a kind of improved specific embodiment, the chauvent's criterion circuit 7 includes:
Operational amplifier U2, the inverting input terminal of operational amplifier U2 are coupled to pickup after being coupled with thermo-sensitive resistor RW1
Circuit 1 is grounded after being also coupled to capacitor C100, and non-inverting input terminal has been coupled to resistance R100, and to be coupled to thermo-sensitive resistor RW1 opposite
In one end of pickup circuit 1, the output end of operational amplifier U2 be coupled with after resistance R101 be coupled to resistance R100 relative to
The other end of pickup circuit 1, the output end are further coupled to power amplification circuit 2, operational amplifier U2 and capacitor C100, resistance
R100 and resistance R101 cooperatively forms a filter, can be effectively according to extraneous temperature by the setting of thermo-sensitive resistor RW1
Spend regulate and control filter can by frequency, if therefore the frequency of voice telecommunication number that exports of pickup circuit 1 reach and utter long and high-pitched sounds
It when frequency, will effectively be filtered out by filter, so realize that inhibits the effect uttered long and high-pitched sounds well, and whole
Circuit structure is simple, easy to accomplish.
As a kind of improved specific embodiment, the frequency detection circuit 4 of uttering long and high-pitched sounds includes:
Light coupling relay U3, the light coupling relay U3 have input circuit and output loop, and the input circuit includes
First input end and the second input terminal, the output loop include the first output end and second output terminal, the first input end
It is coupled with after variable resistance R36 after being coupled with resistance R31 and is coupled to pickup circuit 1, second input end grounding, described first
Output end is coupled to power supply, and second output terminal is grounded after being coupled with variable resistance R37, has been also coupled to be coupled to after resistance R34 aobvious
Show circuit 3, is acted on using the photoelectric conversion of light coupling relay U3, so that it may which the voice telecommunication number for exporting pickup circuit 1 is converted
At the digital signal for carrying out frequency variation according to it, such intelligent control chip can identify this digital signal, Jin Ershi
The effect of the frequency detecting of an existing simple and effective voice telecommunication number, while integrated circuit structure devices are few, implement letter
It is single.
As a kind of improved specific embodiment, the power circuit 6 includes transformer T1, rectifier D1 and pressure stabilizing electricity
Road 61, the transformer T1, rectifier D1 and voltage regulator circuit 61 are serially connected, and wherein transformer T1 is coupled to external alternating current, are used
It is exported after by the decompression of external line voltage, the voltage regulator circuit 61 passes through transformer T1, rectifier for exporting regulated power supply
The setting of D1 and voltage regulator circuit 61, just can effectively will be external the voltage of alternating current to carry out step-down rectifier then defeated after pressure stabilizing
A stable power supply out.
It further include chauvent's criterion device 9 as a kind of improved specific embodiment, the chauvent's criterion device 9 includes shell
91 and the sound channel 92 that is arranged in shell 91 and it is arranged in sound channel 92 to be truncated or open sound channel
92 cutting device 93, external loudspeaker are arranged in sound channel 92, and the cutting device 93 includes soundproof plate 931 and driving
Motor 932 offers storage groove 921 on the conduit wall of the sound channel 92, and the setting of 931 slip of soundproof plate is being deposited
It puts in slot 921, can slide into and open sound channel in storage groove 921, or skid off truncation sound channel out of storage groove 921,
The driving motor 932 and the coupling of frequency detection circuit 4 of uttering long and high-pitched sounds, to receive the frequency of uttering long and high-pitched sounds for the output of frequency detection circuit 4 of uttering long and high-pitched sounds
Signal, and as signal rotates, it is coaxially fixed with screw rod in the shaft of the driving motor 932, which is fixed on
The slot bottom of storage groove 921, screw rod extend from driving motor 932 towards the notch of storage groove 921, fixed on the soundproof plate 931
It is connected with slipping block, the screw rod is penetrated into slipping block and is threadedly coupled with slipping block to drive soundproof plate 931 from storage groove
It skids off or slides into 921 in storage groove 921, since sound is by airborne, when sound channel 92 is cut
After disconnected, sound caused by loudspeaker will be truncated, the external world that can not be transmitted by sound channel 92, such the present embodiment
The middle mating reaction using soundproof plate 931 and driving motor 932 realizes truncation or opens sound channel 92, can have in this way
The realization of effect detects that driving motor 932 can effectively drive soundproof plate when uttering long and high-pitched sounds in frequency detection circuit 4 of uttering long and high-pitched sounds
931 skid off truncation sound channel 92 out of storage groove 921, and sound of uttering long and high-pitched sounds caused by such loudspeaker can not just be transmitted to outer
Boundary so also effectively realizes the effect of a chauvent's criterion, comfortable when improving people using microphone and loudspeaker
Property, it realizes that detection is uttered long and high-pitched sounds in the present embodiment using electric machine controller mode matched with driving motor 932 and signal and then drives
Soundproof plate 931, which glides, is truncated sound channel 92.
The present invention also provides a kind of methods for carrying out chauvent's criterion using above-mentioned component, include the following steps:
Step 1 is picked up the electric signal exported after external microphone converts the sound into using pickup circuit 1, passes through howl later
It makes frequency detection circuit 4 detect frequency of uttering long and high-pitched sounds in electric signal, and is input in display circuit 3 and shows；
Step 2 is input to outside after being amplified the electric signal that pickup circuit 1 exports using power amplification circuit 2 and raised
It is played back in sound device, while calculating the output work of the amplified electric signal of power amplification circuit 2 using power calculation circuit 5
Rate, and be input in display circuit 3 and show；
Step 3, utter long and high-pitched sounds frequency and the output power adjustment external microphone and speaker shown according to display circuit 3
Relative position, wherein specific set-up procedure is first to move external microphone position, 3 display orientation of display circuit when providing
Arrow, if after external microphone is mobile, frequency of uttering long and high-pitched sounds is reduced, then display circuit 3 shows side identical with original moving direction
Position arrow, if uttering long and high-pitched sounds frequency increase, then display circuit 3 shows the direction arrow opposite with original moving direction, so passes through
The setting of step 1 and step 2, can effectively by voice telecommunication number utter long and high-pitched sounds frequency and output power is effectively shown
Out, such people can judge whether the position of microphone at this time is located by checking the numerical value of utter long and high-pitched sounds frequency and output power
In uttering long and high-pitched sounds a little, so there is no need to howl is found by way of feeling after compared with the same in technology, needing to generate and uttering long and high-pitched sounds
It cries a little, greatly increases the efficiency of chauvent's criterion, and use the indicative function of direction arrow, can further contributor go
The relative position between microphone and speaker is adjusted, the inhibition efficiency uttered long and high-pitched sounds is increased.
As a kind of improved specific embodiment of the above method, frequency detection circuit of uttering long and high-pitched sounds is utilized in the step 1
The step of 4 detection frequency, is as follows:
Step 1 one, judges whether the frequency size detected is less than 2000HZ, if so, calculating howl using cycle test method
It is frequency, if it is not, then calculating frequency of uttering long and high-pitched sounds using Measuring Frequency Method, cycle test method is suitable for low-frequency detection, and Measuring Frequency Method is applicable in
In high-frequency detection, setting one by one through the above steps just can be good at realizing frequency detecting, and be listened by human ear
The frequency for taking normal sound is that setting 2000HZ is as point is changed between 200HZ to 4000HZ, therefore in the present embodiment, such as
This can be good at carrying out having detected for frequency.
It is described Step 1: 3 display frequency of display circuit in step 2 as a kind of specific embodiment of the above method
And the step of power, is as follows:
Step 1, variable assignments is shown using display circuit 3, then coordinate the first row is set, show voltage measurement word later
The second row of coordinate is arranged in symbol, shows voltage value, and coordinate the third line is arranged, and shows power measurement character；Fourth line is arranged to sit
Mark shows performance number；
Step 2, the performance number that step 1 is shown is subjected to clear screen after delay is shown, then the first row coordinate is set, later
Display frequency measures character, and the second row coordinate, display frequency numerical value is arranged；
Step 3, the frequency values that step 2 is shown are subjected to clear screen after delay is shown, complete step 1 and step 2
The display of frequency and power, through the above steps 1 setting can be realized and successively show that voltage shows character, then show
Voltage and display power show then character shows the effect of power, so have voltage aobvious before display voltage and power
Show that character and power show character, such people can effectively know that the numerical value shown at this time is voltage value or power
Numerical value, and step 2 and step 3 also can effectively realize that the numerical value for allowing people to know display is frequency, while in power
Carried out primary clearing between frequency, the effect alternately displayed may be implemented, enable intelligent control chip preferably into
Row is shown.
In conclusion the audio-frequency power amplifier of the present embodiment and the setting of method, it can be effectively by preferentially showing
Frequency and the mode of output power then avoid the occurrence of asking of uttering long and high-pitched sounds to allow being adjusted between people's microphone and sound source
Topic, so compared with the prior art in the mode uttered long and high-pitched sounds of inhibition, the effect inhibited in advance may be implemented, greatly increase howl
The inhibition efficiency cried.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of chauvent's criterion audio-frequency power amplifier, it is characterised in that: include:
Pickup circuit (1), is coupled to external microphone, the voice telecommunication after sound conversion for receiving external microphone output
Number, and exported after converting；
Power amplification circuit (2) is coupled to pickup circuit (1), is further coupled to external loudspeaker, for receiving pickup circuit (1)
The voice telecommunication number of output, and will be output in external loudspeaker after the amplification of this voice telecommunication number, driving external loudspeaker hair
Sound；
Display circuit (3), which is coupled with frequency detection circuit of uttering long and high-pitched sounds (4) and power calculation circuit (5), described
Frequency detection circuit (4) of uttering long and high-pitched sounds is coupled to pickup circuit (1), in the voice telecommunication number for detecting pickup circuit (1) output
It utters long and high-pitched sounds frequency, and is input in display circuit (3) and shows, the power calculation circuit (5) is coupled to power amplifier
(2), it for receiving amplified voice telecommunication number, and calculates in the power input to display circuit (3) of the voice telecommunication number and shows
It shows and；
Power circuit (6), is coupled to external alternating current, for output after mains supply is converted into power supply to pickup circuit (1), function
Rate amplifying circuit (2), display circuit (3), frequency detection circuit of uttering long and high-pitched sounds (4) and power calculation circuit (5) power supply.
2. chauvent's criterion audio-frequency power amplifier according to claim 1, it is characterised in that: the pickup circuit (1) with
Chauvent's criterion circuit (7) are also coupled between power amplification circuit (2), for pickup circuit (1) to be output to power amplification electricity
Voice telecommunication number inhibition in road (2) is input in power amplification circuit (2) after uttering long and high-pitched sounds.
3. chauvent's criterion audio-frequency power amplifier according to claim 1 or 2, it is characterised in that: the power calculation electricity
It is coupled between road (5) and power amplification circuit (2) conversion circuit (8), the conversion circuit (8) includes:
Rectification circuit (81) is coupled to power amplification circuit (2), the amplification voice electricity for exporting power amplification circuit (2)
Signal exports after being rectified；
Filter circuit (82) is coupled to rectification circuit (81), is filtered for the voice telecommunication number after the rectification to output；
A/D conversion circuit (83) is coupled to filter circuit (82), power calculation circuit (5) is further coupled to, after accepting filter
Electric signal, and be converted into digital signal and be input in power calculation circuit (5).
4. chauvent's criterion audio-frequency power amplifier according to claim 1 or 2, it is characterised in that: the pickup circuit (1)
Include:
Operational amplifier U1A, the inverting input terminal of operational amplifier U1A is coupled with after resistance R4 be coupled with capacitor C3 after couple
In external microphone, capacitor C3 has been also coupled to resistance R3 and has been followed by power supply, the non-inverting input terminal coupling of the operational amplifier U1A
It is grounded after having resistance R7 and resistance R9, has been also coupled to resistance R6 and has been followed by power supply, the output end of the operational amplifier U1A is coupled with
The inverting input terminal of operational amplifier U1A is coupled after capacitor C1 and resistance R1 parallel with one another；
Operational amplifier U1B, the inverting input terminal of operational amplifier U1B are coupled to operation amplifier after being coupled with variable resistance R5
The output end of device U1A, the non-inverting input terminal of the operational amplifier U1B are coupled with one end that resistance R7 is coupled to after resistance R8,
The output end of operational amplifier U1B is coupled to operational amplifier U1B's after being coupled with capacitor C2 and resistance R2 parallel with one another
Inverting input terminal has been also coupled to capacitor C4 and has been coupled to power amplification circuit (2).
5. chauvent's criterion audio-frequency power amplifier according to claim 2, it is characterised in that: the chauvent's criterion circuit
(7) include:
Operational amplifier U2, the inverting input terminal of operational amplifier U2 are coupled to pickup circuit after being coupled with thermo-sensitive resistor RW1
(1), be grounded after being also coupled to capacitor C100, non-inverting input terminal be coupled to resistance R100 be coupled to thermo-sensitive resistor RW1 relative to
One end of pickup circuit (1), the output end of operational amplifier U2 be coupled with after resistance R101 be coupled to resistance R100 relative to
The other end of pickup circuit (1), the output end are further coupled to power amplification circuit (2).
6. chauvent's criterion audio-frequency power amplifier according to claim 1 or claim 2, it is characterised in that: the frequency detecting of uttering long and high-pitched sounds
Circuit (4) includes:
Light coupling relay U3, the light coupling relay U3 have input circuit and output loop, and the input circuit includes first
Input terminal and the second input terminal, the output loop include the first output end and second output terminal, the first input end coupling
Have and be coupled to pickup circuit (1) after being coupled with resistance R31 after variable resistance R36, second input end grounding, described first is defeated
Outlet is coupled to power supply, and second output terminal is grounded after being coupled with variable resistance R37, is coupled to display after being also coupled to resistance R34
Circuit (3).
7. chauvent's criterion audio-frequency power amplifier according to claim 1 or 2, it is characterised in that: further include chauvent's criterion
Device (9), the chauvent's criterion device (9) include that shell (91) and the sound channel (92) being arranged in shell (91) and setting exist
The interior cutting device (93) to be truncated or open sound channel (92) of sound channel (92), external loudspeaker are arranged in sound
In channel (92), the cutting device (93) includes soundproof plate (931) and driving motor (932), the sound channel (92)
It is offered on conduit wall storage groove (921), the setting of soundproof plate (931) slip can slide into storage groove (921)
Sound channel is opened in storage groove (921), or skids off truncation sound channel, the driving motor out of storage groove (921)
(932) with utter long and high-pitched sounds frequency detection circuit (4) coupling, with receive utter long and high-pitched sounds frequency detection circuit (4) output frequency signal of uttering long and high-pitched sounds, and
As signal rotates, it is coaxially fixed with screw rod in the shaft of the driving motor (932), which, which is fixed on, deposits
The slot bottom of slot (921) is put, screw rod extends from driving motor (932) towards the notch of storage groove (921), the soundproof plate (931)
On be fixedly connected with slipping block, the screw rod is penetrated into slipping block and is threadedly coupled with slipping block to drive soundproof plate (931)
It skids off or slides into from storage groove (921) in storage groove (921).
8. a kind of method for being inhibited to utter long and high-pitched sounds using audio-frequency power amplifier described in claim 1 to 7 any one, feature are existed
In: include the following steps:
Step 1 picks up the electric signal exported after external microphone converts the sound into using pickup circuit (1), later by uttering long and high-pitched sounds
Frequency detection circuit (4) detects frequency of uttering long and high-pitched sounds in electric signal, and is input in display circuit (3) and shows；
Step 2 is input to outside after being amplified the electric signal that pickup circuit (1) exports using power amplification circuit (2) and raised
It is played back in sound device, while calculating the output of power amplification circuit (2) amplified electric signal using power calculation circuit (5)
Power, and be input in display circuit (3) and show；
Step 3, utter long and high-pitched sounds frequency and the output power adjustment external microphone and speaker shown according to display circuit (3)
Relative position, wherein specific set-up procedure is first to move external microphone position, display circuit (3) display orientation when providing
Arrow, if after external microphone is mobile, frequency of uttering long and high-pitched sounds is reduced, then display circuit (3) display is identical with original moving direction
Direction arrow, if uttering long and high-pitched sounds frequency increase, then display circuit (3) shows the direction arrow opposite with original moving direction.
9. according to the method described in claim 8, the frequency detection circuit it is characterized by: the utilization in the step 1 is uttered long and high-pitched sounds
(4) the step of detecting frequency is as follows:
Step 1 one, judges whether the frequency size detected is less than 2000HZ, if so, calculating frequency of uttering long and high-pitched sounds using cycle test method
Rate, if it is not, then calculating frequency of uttering long and high-pitched sounds using Measuring Frequency Method.
10. according to the method described in claim 8, it is characterized by: described Step 1: the display circuit (3) in step 2 is aobvious
The step of showing frequency and power is as follows:
Step 1, variable assignments is shown using display circuit (3), then coordinate the first row is set, show voltage measurement word later
The second row of coordinate is arranged in symbol, shows voltage value, and coordinate the third line is arranged, and shows power measurement character；Fourth line is arranged to sit
Mark shows performance number；
Step 2, the performance number that step 1 is shown is subjected to clear screen after delay is shown, then the first row coordinate is set, show later
The second row coordinate, display frequency numerical value is arranged in frequency measurement character；
Step 3, the frequency values that step 2 is shown are subjected to clear screen after delay is shown, complete the frequency of step 1 and step 2
With the display of power.
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| CN109462798B (en) | 2020-10-30 |
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