CN208012753U - Voice signal detection circuit based on Fibre Optical Sensor - Google Patents
Voice signal detection circuit based on Fibre Optical Sensor Download PDFInfo
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- CN208012753U CN208012753U CN201820547314.7U CN201820547314U CN208012753U CN 208012753 U CN208012753 U CN 208012753U CN 201820547314 U CN201820547314 U CN 201820547314U CN 208012753 U CN208012753 U CN 208012753U
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Abstract
The disclosure provides a kind of voice signal detection circuit based on Fibre Optical Sensor, is related to technical field of photo communication.The voice signal detection circuit includes：Photoelectric converter, preamplifier, noise filtering amplifier, band-pass filter amplifier and power amplifier driving circuit；The optical signal that the input terminal of the photoelectric converter is used to transmit in reception optical fiber, the output end of the photoelectric converter is connect after passing sequentially through the preamplifier and noise filtering amplifier with the input terminal of the band-pass filter amplifier, the output end of the band-pass filter amplifier is connect with the input terminal of the power amplifier driving circuit, and the output end of the power amplifier driving circuit is connect with playback equipment.The disclosure can make the frequency distortion of the voice signal after reduction small, improve the reduction effect of voice signal.
Description
Technical field
This disclosure relates to technical field of photo communication more particularly to a kind of voice signal detection circuit based on Fibre Optical Sensor.
Background technology
With the development of optical fiber technology, optical fiber is not only used to transmission information, is also used as passive sensor to detect temperature
The variation of the physical quantitys such as degree, disturbance, sound, and it is entirely different to the detection method of fiber-optic signal in different application areas.
Wherein, when detecting voice signal, other than voice signal to be restored, also to ensure good as passive sensor using optical fiber
Sound quality.
In the prior art, to optical fiber as passive sensor come when detecting voice signal, typically first by entire sound
Signal carries out denoising, but during denoising, can noise and partial sound signal is carried out at the same time and be filtered out, to
So that the sound signal frequencies distortion after restoring is serious, the reduction effect of voice signal is reduced.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Utility model content
The disclosure is designed to provide a kind of voice signal detection circuit based on Fibre Optical Sensor, after making reduction
The frequency distortion of voice signal is small, improves the reduction effect of voice signal.
Other characteristics and advantages of the disclosure will be apparent from by the following detailed description, or partially by the disclosure
Practice and acquistion.
According to one aspect of the disclosure, a kind of voice signal detection circuit based on Fibre Optical Sensor is provided, including：Photoelectricity
Converter, preamplifier, noise filtering amplifier, band-pass filter amplifier and power amplifier driving circuit；The photoelectric converter
Optical signal of the input terminal for transmitting in reception optical fiber, the output end of the photoelectric converter passes sequentially through the preposition amplification
It is connect with the input terminal of the band-pass filter amplifier after device and noise filtering amplifier, the output of the band-pass filter amplifier
End is connect with the input terminal of the power amplifier driving circuit, and the output end of the power amplifier driving circuit is connect with playback equipment.
In a kind of exemplary embodiment of the disclosure, the voice signal detection circuit further includes audio-frequency module, the sound
The input terminal of frequency module is connect with the output end of the band-pass filter amplifier, and output end and the outside AD of the audio-frequency module are adopted
Egf block connects.
In a kind of exemplary embodiment of the disclosure, the power amplifier includes speaker driving circuit and earphone driving electricity
Road.
In a kind of exemplary embodiment of the disclosure, the photoelectric converter includes model PD-75-SM-FC/APC
Detector.
In a kind of exemplary embodiment of the disclosure, the preamplifier includes the first amplification of model OPA2227
Device Q1, the inverting input of the first amplifier Q1 are connect with the 2nd pin of the photoelectric converter, first amplifier
The in-phase input end of Q1 is connect with the 3rd pin of the photoelectric converter, the inverting input of the first amplifier Q1 and institute
It states and is parallel with resistance R1 and capacitance C1 between the output end of the first amplifier Q1, the output end of the first amplifier Q1 also passes through
Resistance R2 ground connection, the 1st pin of the photoelectric converter and the 3rd pin are grounded.
In a kind of exemplary embodiment of the disclosure, the noise filtering amplifier includes the second of model OPA2227
Amplifier Q2 and adjustable resistance RP1, the in-phase input end of the second amplifier Q2 pass through capacitance C2 and first amplifier
The output end of Q1 connects, and the in-phase input end of the second amplifier Q2 is also grounded by resistance R3, second amplifier
The inverting input of Q2 is connect with one end of the first end of adjustable resistance RP1, one end of capacitance C3 and resistance R4 respectively, described
The other end of resistance R4 is grounded, the other end of the capacitance C3, the second end of the adjustable resistance RP1 and the adjustable resistance
The sliding end of RP1 is connect with the output end of the second amplifier Q2.
In a kind of exemplary embodiment of the disclosure, the band-pass filter amplifier includes the third of model OPA2227
Amplifier Q3, the 4th amplifier Q4 of model OPA2227 and the 5th amplifier Q5 of model OPA2227, the third are put
The in-phase input end of big device Q3 is grounded by resistance R6, and the in-phase input end of the third amplifier Q3 also with capacitance C6 one
End connection, the other end of capacitance C6 are connect by capacitance C5 with the output end of the second amplifier Q2, and the capacitance C6's is another
One end is also connect by resistance R5 with the output end of the third amplifier Q3, the inverting input point of the third amplifier Q3
It is not connect with one end of one end of resistance R7 and resistance R8, the other end of resistance R8 ground connection, the other end of resistance R7 and described the
The output end of three amplifier Q3 connects；The in-phase input end of the 4th amplifier Q4 is grounded by capacitance C8, and the described 4th
The in-phase input end of amplifier Q4 is connect with one end of resistance R10, and the other end of resistance R10 is put by resistance R9 and the third
The output end connection of big device Q3, the other end of the resistance R10 also pass through the output end of capacitance C7 and the 4th amplifier Q4
Connection, the inverting input of the 4th amplifier Q4 are connect by resistance R11 with the output end of the 4th amplifier Q4；Institute
The in-phase input end for stating the 5th amplifier Q5 is grounded by capacitance C10, and the in-phase input end of the 5th amplifier Q5 also with
One end of resistance R13 connects, and the other end of resistance R13 is connect by resistance R12 with the output end of the 4th amplifier Q4, the electricity
The other end of resistance R13 is also connect by capacitance C9 with the output end of the 5th amplifier Q5, and the 5th amplifier Q5's is anti-
Phase input terminal is connect with one end of one end of resistance R14 and resistance R15 respectively, the other end ground connection of resistance R15, resistance R14's
The other end is connect with the output end of the 5th amplifier Q5.
In a kind of exemplary embodiment of the disclosure, the speaker driving circuit includes the chip U6 of model TDA2822,
The playback equipment includes loudspeaker；The 6th pin of the chip U6 connects with one end of resistance R21 and one end of capacitance C17 respectively
It connects, the other end ground connection of resistance R21, the other end of capacitance C17 is connect with the sliding end of variable resistance RP4, variable resistance RP4's
First end is connect with the output end of the 5th amplifier Q5, the second end ground connection of variable resistance RP4；The 7th of the chip U6
Pin is connect with one end of one end of resistance R20 and capacitance C16 respectively, and the other end ground connection of resistance R20, capacitance C16's is another
End is connect with the sliding end of variable resistance RP3, and the first end of variable resistance RP3 and the output end of the 5th amplifier Q5 connect
It connects, the second end ground connection of variable resistance RP3；The 1st pin of the chip U6 is connected by one end of electrolytic capacitor E6 and loudspeaker,
The 3rd pin of the chip U6 is connected by the other end of electrolytic capacitor E5 and loudspeaker, and the 5th pin of the chip U6 passes through electricity
Capacitance E4 ground connection is solved, the 8th pin of the chip U6 is grounded by electrolytic capacitor E3.
In a kind of exemplary embodiment of the disclosure, the earphone driving circuit includes the chip U5 of model LM386, institute
It includes earphone to state playback equipment；The 3rd pin of the chip U5 is connect with the sliding end of variable resistance RP2, variable resistance RP2's
First end is connect by capacitance C12 with the output end of the 5th amplifier Q5, the second end ground connection of variable resistance RP2, described
The 5th pin of chip U5 is connect by electrolytic capacitor E2 with earphone.
In a kind of exemplary embodiment of the disclosure, the audio-frequency module includes the chip U4 of model TLC277ID, institute
The 3rd pin for stating chip U4 is connect by capacitance C11 with the output end of the 5th amplifier Q5, and the 1st of the chip U4 draws
Foot is connect with the 2nd pin, and the 1st pin of the chip U4 respectively with the anode of electrolytic capacitor E1, one end of capacitance C14 and electricity
One end connection of R18 is hindered, the cathode of electrolytic capacitor E1 and the other end of capacitance C14 are connect with the AD sampling modules, resistance
The other end of R18 is grounded.
The voice signal detection circuit based on Fibre Optical Sensor that disclosure illustrative embodiments are provided, will pass in optical fiber
Defeated optical signal is converted to electric signal through photoelectric converter, and transformed electric signal, which is then sent into preamplifier, carries out rationally
Then amplified electric signal is sent into noise filtering amplifier and carries out noise filtering by the amplification of multiple again, and further will
Filtered electric signal is amplified, then by amplified electric signal be sent into band-pass filter amplifier to the frequency of optical signal into
Row control, obtains the audio signal that human ear can be heard, is finally amplified obtained audio signal through power amplifier driving circuit
It is played out, is realized the reduction of the voice signal based on Fibre Optical Sensor, since the utility model is by playback equipment afterwards
Transformed electric signal is subjected to classification amplification by preamplifier, noise filtering amplifier and band-pass filter amplifier, and
Rational design has been carried out to amplification factor, so that the frequency distortion of the voice signal after reduction is small, has improved sound letter
Number reduction effect.
It should be understood that above general description and following detailed description is only exemplary and explanatory, not
The disclosure can be limited.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.It should be evident that the accompanying drawings in the following description is only the disclosure
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 schematically shows the principle of the voice signal detection circuit based on Fibre Optical Sensor in disclosure exemplary embodiment
Figure；
Fig. 2 schematically shows photoelectric converter in disclosure exemplary embodiment, preamplifier, noise filtering amplifier
Circuit connection diagram between band-pass filter amplifier；
Fig. 3 schematically shows the circuit connection diagram of speaker driving circuit in disclosure exemplary embodiment；
Fig. 4 schematically shows the circuit connection diagram of disclosure exemplary embodiment middle ear drive circuit；
Fig. 5 schematically shows the circuit connection diagram of disclosure exemplary embodiment middle pitch frequency module.
Specific implementation mode
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be real in a variety of forms
It applies, and is not understood as limited to example set forth herein；On the contrary, these embodiments are provided so that the disclosure will more comprehensively and
Completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.Described feature, structure or characteristic
It can in any suitable manner be incorporated in one or more embodiments.In the following description, many details are provided
Embodiment of the disclosure is fully understood to provide.It will be appreciated, however, by one skilled in the art that the disclosure can be put into practice
Technical solution and omit it is one or more in the specific detail, or may be used other methods, constituent element, device,
Step etc..In other cases, known solution is not shown in detail or describes to avoid making all aspects of this disclosure become mould
Paste.
In addition, attached drawing is only the schematic illustrations of the disclosure, it is not necessarily drawn to scale.The thickness of each layer in attached drawing
Do not reflect actual proportions with shape, is merely for convenience and purposes of illustration of content of this disclosure.Identical reference numeral indicates identical in figure
Or similar part, thus repetition thereof will be omitted.
This example embodiment provides a kind of voice signal detection circuit based on Fibre Optical Sensor, as shown in Figure 1, the sound
Sound signal detection circuit may include：Photoelectric converter 101, preamplifier 102, noise filtering amplifier 103, bandpass filtering
Amplifier 104 and power amplifier driving circuit 105；The light letter that the input terminal of the photoelectric converter 101 is used to transmit in reception optical fiber
Number, the output end of the photoelectric converter 101 pass sequentially through after the preamplifier 102 and noise filtering amplifier 103 with
The input terminal of the band-pass filter amplifier 104 connects, the output end of the band-pass filter amplifier 104 and the power amplifier
105 input terminal connection, the output end of the power amplifier driving circuit 105 are connect with playback equipment 106.Wherein, the power amplifier electricity
Road 105 may include speaker driving circuit 1051 and/or earphone driving circuit 1052.
As a further improvement of the above technical scheme, the voice signal detection circuit based on Fibre Optical Sensor further includes
Audio-frequency module 107, the input terminal of the audio-frequency module 107 are connect with the output end of the band-pass filter amplifier 104, the sound
The output end of frequency module 107 is connect with outside AD sampling modules 108.
In the present embodiment, as shown in Fig. 2, the photoelectric converter 101 includes the detection of model PD-75-SM-FC/APC
Device.
The preamplifier 102 includes the first amplifier Q1 of model OPA2227, and the first amplifier Q1's is anti-
Phase input terminal is connect with the 2nd pin of the photoelectric converter 101, in-phase input end and the light of the first amplifier Q1
3rd pin of electric transducer 101 connects, the output of the inverting input of the first amplifier Q1 and the first amplifier Q1
Resistance R1 and capacitance C1 are parallel between end, the output end of the first amplifier Q1 is also grounded by resistance R2, the photoelectricity
1st pin of converter 101 and the 3rd pin are grounded.
Specifically, when actually debugging, the amplification factor of the first operational amplifier Q1 can be set as to 30~50 times, conveniently
Coordinated with the noise filtering amplifier 103 subsequently connecting, improves noise filtering effect.
The noise filtering amplifier 103 includes the second amplifier Q2 and adjustable resistance RP1 of model OPA2227, institute
The in-phase input end for stating the second amplifier Q2 is connect by capacitance C2 with the output end of the first amplifier Q1, and described second
The in-phase input end of amplifier Q2 is also grounded by resistance R3, the inverting input of the second amplifier Q2 respectively with adjustable electric
Hinder one end connection of the first end of RP1, one end of capacitance C3 and resistance R4, the other end ground connection of the resistance R4, the electricity
The sliding end for holding the other end of C3, the second end of the adjustable resistance RP1 and the adjustable resistance RP1 amplifies with described second
The output end of device Q2 connects.
Specifically, can be by adjusting the value of capacitance C3 so that noise filtering amplifier 103 can will be greater than the letter of 20KHz
It number is filtered out.
The band-pass filter amplifier 104 includes the third amplifier Q3 of model OPA2227, model OPA2227
The in-phase input end of the 5th amplifier Q5 of 4th amplifier Q4 and model OPA2227, the third amplifier Q3 pass through electricity
R6 ground connection is hindered, and the in-phase input end of the third amplifier Q3 is also connect with one end of capacitance C6, the other end of capacitance C6 is logical
It crosses capacitance C5 to connect with the output end of the second amplifier Q2, the other end of the capacitance C6 also passes through resistance R5 and described the
The output end of three amplifier Q3 connects, the inverting input of the third amplifier Q3 respectively with one end of resistance R7 and resistance R8
One end connection, the other end ground connection of resistance R8, the other end of resistance R7 connect with the output end of the third amplifier Q3；Institute
The in-phase input end for stating the 4th amplifier Q4 is grounded by capacitance C8, and the in-phase input end and resistance of the 4th amplifier Q4
One end of R10 connects, and the other end of resistance R10 is connect by resistance R9 with the output end of the third amplifier Q3, the electricity
The other end of resistance R10 is also connect by capacitance C7 with the output end of the 4th amplifier Q4, and the 4th amplifier Q4's is anti-
Phase input terminal is connect by resistance R11 with the output end of the 4th amplifier Q4；The homophase input of the 5th amplifier Q5
End is grounded by capacitance C10, and the in-phase input end of the 5th amplifier Q5 is also connect with one end of resistance R13, resistance R13
The other end connect with the output end of the 4th amplifier Q4 by resistance R12, the other end of the resistance R13 also passes through capacitance C9
Connect with the output end of the 5th amplifier Q5, the inverting input of the 5th amplifier Q5 respectively with resistance R14 one
End is connected with one end of resistance R15, and the other end ground connection of resistance R15, the other end of resistance R14 is with the 5th amplifier Q5's
Output end connects.
Specifically, band-pass filter amplifier 104 is made of bivalent high-pass filter and second-order low-pass filter, wherein two
Rank high-pass filter is by third operational amplifier Q3, capacitance C5, capacitance C6, resistance R5, resistance R6, resistance R7 and resistance R8 groups
At for filtering out the signal for being less than 100KHz；Bivalent high-pass filter is by four-operational amplifier Q4, the 5th operational amplifier
Q5, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, capacitance C7, capacitance C8, capacitance
C9 and capacitance C10 compositions, for filtering out the signal for being more than 14KHz, finally by the FREQUENCY CONTROL of signal in 100HZ to 14KHz's
In range, the audio signal within the scope of this is in 20Hz~20KHz audio signal frequencies section that human ear can be heard, is more than
Audio frequency range 300Hz~3.4KHz of phone, so as to ensure the quality of the voice signal after reduction.
It should be noted that indicating photoelectric converter using T1 in Fig. 2.
In the present embodiment, as shown in figure 3, the speaker driving circuit 1051 includes the chip U6 of model TDA2822, institute
It includes loudspeaker 1061 to state playback equipment 106；The 6th pin of the chip U6 respectively with one end of resistance R21 and capacitance C17 one
End connection, the other end ground connection of resistance R21, the other end of capacitance C17 are connect with the sliding end of variable resistance RP4, variable resistance
The first end of RP4 is connect with the output end of the 5th amplifier Q5, the second end ground connection of variable resistance RP4；The chip U6
The 7th pin connect respectively with one end of one end of resistance R20 and capacitance C16, the other end of resistance R20 ground connection, capacitance C16's
The other end is connect with the sliding end of variable resistance RP3, the output end of the first end of variable resistance RP3 and the 5th amplifier Q5
Connection, the second end ground connection of variable resistance RP3；The 1st pin of the chip U6 passes through electrolytic capacitor E6 and the one of loudspeaker 1061
End connection, the 3rd pin of the chip U6 connect by electrolytic capacitor E5 with the other end of loudspeaker 1061, and the of the chip U6
5 pins are grounded by electrolytic capacitor E4, and the 8th pin of the chip U6 is grounded by electrolytic capacitor E3.
In the present embodiment, as shown in figure 4, the earphone driving circuit 1052 includes the chip U5 of model LM386, it is described
Playback equipment includes earphone 1062；The 3rd pin of the chip U5 is connect with the sliding end of variable resistance RP2, variable resistance RP2
First end connect with the output end of the 5th amplifier Q5 by capacitance C12, the second end of variable resistance RP2 ground connection, institute
The 5th pin for stating chip U5 is connect by electrolytic capacitor E2 with earphone 1062.
In the present embodiment, as shown in figure 5, the audio-frequency module 107 includes the chip U4 of model TLC277ID, the core
The 3rd pin of piece U4 is connect by capacitance C11 with the output end of the 5th amplifier Q5, the 1st pin of the chip U4 with
2nd pin connect, and the 1st pin of the chip U4 respectively with the anode of electrolytic capacitor E1, one end of capacitance C14 and resistance
One end of R18 connects, and the cathode of electrolytic capacitor E1 and the other end of capacitance C14 are connect with the AD sampling modules 108, resistance
The other end of R18 is grounded.
It should be noted that indicating to connect with AD sampling modules 108 using network label AD in Fig. 5.
The utility model provides a kind of voice signal detection circuit based on Fibre Optical Sensor, and the light transmitted in optical fiber is believed
Number electric signal is converted to through photoelectric converter, transformed electric signal feeding preamplifier is then subjected to putting for reasonable multiple
Greatly, then amplified electric signal is sent into noise filtering amplifier again and carries out noise filtering, and further will be filtered
Electric signal is amplified, then amplified electric signal is sent into band-pass filter amplifier and is controlled the frequency of optical signal,
The audio signal that human ear can be heard is obtained, finally sets obtained audio signal by playing after power amplifier is amplified
It is standby to play out, it realizes the reduction of the voice signal based on Fibre Optical Sensor, since the utility model is by transformed electricity
Signal carries out classification amplification by preamplifier, noise filtering amplifier and band-pass filter amplifier, and to amplification factor into
Rational design of having gone improves the reduction effect of voice signal so that the frequency distortion of the voice signal after reduction is small；
In addition, the utility model increases audio-frequency module, finally obtained audio signal is also sent to audio-frequency module, audio-frequency module will
The audio signal received is changed into single supply by dual power supply, is the utility model convenient for being matched with external AD sampling modules
Voice signal detection circuit great convenience is provided using the connection of module with external.
Claims (10)
1. a kind of voice signal detection circuit based on Fibre Optical Sensor, which is characterized in that including photoelectric converter, preposition amplification
Device, noise filtering amplifier, band-pass filter amplifier and power amplifier driving circuit；
The input terminal of the photoelectric converter is used for the optical signal that transmits in reception optical fiber, the output end of the photoelectric converter according to
It is secondary by being connect with the input terminal of the band-pass filter amplifier after the preamplifier and noise filtering amplifier, the band
The output end of bandpass filter amplifier is connect with the input terminal of the power amplifier driving circuit, the output end of the power amplifier driving circuit with
Playback equipment connects.
2. voice signal detection circuit according to claim 1, which is characterized in that further include audio-frequency module, the audio
The input terminal of module is connect with the output end of the band-pass filter amplifier, and output end and the outside AD of the audio-frequency module are sampled
Module connects.
3. voice signal detection circuit according to claim 2, which is characterized in that the power amplifier driving circuit includes speaker
Driving circuit and/or earphone driving circuit.
4. voice signal detection circuit according to claim 3, which is characterized in that the photoelectric converter includes model
The detector of PD-75-SM-FC/APC.
5. the voice signal detection circuit according to claim 4 based on Fibre Optical Sensor, it is characterised in that：It is put before described
Big device includes that the inverting input of the first amplifier Q1, the first amplifier Q1 of model OPA2227 and the photoelectricity turn
2nd pin of parallel operation connects, and the in-phase input end of the first amplifier Q1 is connect with the 3rd pin of the photoelectric converter,
It is parallel with resistance R1 and capacitance between the inverting input of the first amplifier Q1 and the output end of the first amplifier Q1
The output end of C1, the first amplifier Q1 are also grounded by resistance R2, the 1st pin of the photoelectric converter and the 3rd pin
It is grounded.
6. the voice signal detection circuit according to claim 5 based on Fibre Optical Sensor, which is characterized in that the noise filter
Twt amplifier includes the second amplifier Q2 and adjustable resistance RP1 of model OPA2227, and the second amplifier Q2's is same mutually defeated
Enter end to connect with the output end of the first amplifier Q1 by capacitance C2, and the in-phase input end of the second amplifier Q2 is also
Be grounded by resistance R3, the inverting input of the second amplifier Q2 respectively with the first end of adjustable resistance RP1, capacitance C3
One end and the connection of one end of resistance R4, the other end ground connection of the resistance R4, the other end of the capacitance C3, the adjustable electric
The sliding end of the second end and the adjustable resistance RP1 that hinder RP1 is connect with the output end of the second amplifier Q2.
7. the voice signal detection circuit according to claim 6 based on Fibre Optical Sensor, which is characterized in that the band logical filter
Twt amplifier includes the 4th amplifier Q4 and model of the third amplifier Q3 of model OPA2227, model OPA2227
The in-phase input end of the 5th amplifier Q5 of OPA2227, the third amplifier Q3 are grounded by resistance R6, and the third is put
The in-phase input end of big device Q3 is also connect with one end of capacitance C6, and the other end of capacitance C6 is amplified by capacitance C5 and described second
The output end of device Q2 connects, and the other end of the capacitance C6 is also connected by the output end of the resistance R5 and third amplifier Q3
It connects, the inverting input of the third amplifier Q3 is connect with one end of one end of resistance R7 and resistance R8 respectively, resistance R8's
The other end is grounded, and the other end of resistance R7 is connect with the output end of the third amplifier Q3；
The in-phase input end of the 4th amplifier Q4 is grounded by capacitance C8, and the in-phase input end of the 4th amplifier Q4
It being connect with one end of resistance R10, the other end of resistance R10 is connect by resistance R9 with the output end of the third amplifier Q3,
The other end of the resistance R10 is also connect by capacitance C7 with the output end of the 4th amplifier Q4, the 4th amplifier
The inverting input of Q4 is connect by resistance R11 with the output end of the 4th amplifier Q4；
The in-phase input end of the 5th amplifier Q5 is grounded by capacitance C10, and the homophase input of the 5th amplifier Q5
End is also connect with one end of resistance R13, and the other end of resistance R13 is connect by resistance R12 with the output end of the 4th amplifier Q4,
The other end of the resistance R13 is also connect by capacitance C9 with the output end of the 5th amplifier Q5, the 5th amplifier
The inverting input of Q5 is connect with one end of one end of resistance R14 and resistance R15 respectively, the other end ground connection of resistance R15, resistance
The other end of R14 is connect with the output end of the 5th amplifier Q5.
8. the voice signal detection circuit according to claim 7 based on Fibre Optical Sensor, which is characterized in that the case driving
Circuit includes the chip U6 of model TDA2822, and the playback equipment includes loudspeaker；
The 6th pin of the chip U6 is connect with one end of one end of resistance R21 and capacitance C17 respectively, the other end of resistance R21
Ground connection, the other end of capacitance C17 are connect with the sliding end of variable resistance RP4, and the first end of variable resistance RP4 is put with the described 5th
The output end connection of big device Q5, the second end ground connection of variable resistance RP4；The 7th pin of the chip U6 is respectively with resistance R20's
One end is connected with one end of capacitance C16, the other end ground connection of resistance R20, the cunning of the other end and variable resistance RP3 of capacitance C16
Moved end connects, and the first end of variable resistance RP3 is connect with the output end of the 5th amplifier Q5, and the second of variable resistance RP3
End ground connection；The 1st pin of the chip U6 is connected by one end of electrolytic capacitor E6 and loudspeaker, the 3rd pin of the chip U6
It is connected by the other end of electrolytic capacitor E5 and loudspeaker, the 5th pin of the chip U6 is grounded by electrolytic capacitor E4, the core
The 8th pin of piece U6 is grounded by electrolytic capacitor E3.
9. the voice signal detection circuit according to claim 7 based on Fibre Optical Sensor, which is characterized in that the earphone drives
Dynamic circuit includes the chip U5 of model LM386, and the playback equipment includes earphone；
The 3rd pin of the chip U5 is connect with the sliding end of variable resistance RP2, and the first end of variable resistance RP2 passes through capacitance
C12 is connect with the output end of the 5th amplifier Q5, the second end ground connection of variable resistance RP2, the 5th pin of the chip U5
It is connect with earphone by electrolytic capacitor E2.
10. the voice signal detection circuit according to claim 7 based on Fibre Optical Sensor, which is characterized in that the audio
Module includes the chip U4 of model TLC277ID, and the 3rd pin of the chip U4 passes through capacitance C11 and the 5th amplifier
The output end of Q5 connects, and the 1st pin of the chip U4 is connect with the 2nd pin, and the 1st pin of the chip U4 respectively with electricity
The anode of solution capacitance E1, one end of capacitance C14 are connected with one end of resistance R18, and the cathode of electrolytic capacitor E1 and capacitance C14's is another
One end is connect with the AD sampling modules, the other end ground connection of resistance R18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820547314.7U CN208012753U (en) | 2018-04-17 | 2018-04-17 | Voice signal detection circuit based on Fibre Optical Sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820547314.7U CN208012753U (en) | 2018-04-17 | 2018-04-17 | Voice signal detection circuit based on Fibre Optical Sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208012753U true CN208012753U (en) | 2018-10-26 |
Family
ID=63893046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820547314.7U Active CN208012753U (en) | 2018-04-17 | 2018-04-17 | Voice signal detection circuit based on Fibre Optical Sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208012753U (en) |
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2018
- 2018-04-17 CN CN201820547314.7U patent/CN208012753U/en active Active
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