CN107948866A - A kind of feedback interference low distortion audio frequency broadcast system - Google Patents
A kind of feedback interference low distortion audio frequency broadcast system Download PDFInfo
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- CN107948866A CN107948866A CN201810007529.4A CN201810007529A CN107948866A CN 107948866 A CN107948866 A CN 107948866A CN 201810007529 A CN201810007529 A CN 201810007529A CN 107948866 A CN107948866 A CN 107948866A
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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
-
- 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 feedback interference low distortion audio frequency broadcast system, it is characterised in that：Including amplifier U2, audio receiving module, the bandwidth-limited circuit being connected with audio receiving module, the resistance R13 being serially connected between 1 pin of amplifier U2 and 3 pins, the polar capacitor C5 that cathode is connected with 1 pin of amplifier U2, anode is sequentially connected after polar capacitor C6, potentiometer R15 and resistance R14 with 11 pins of amplifier U2 etc..The present invention can be isolated the interfering noise outside setting range, effectively eliminate interfering noise, improve communication effect.The present invention can reduce the amplified distortion factor of audio signal, so as to improve communication effect.The interference signal that polar circuit and loudspeaker feedback are returned after the present invention can isolate, so as to improve the stability of audio signal.
Description
Technical field
The present invention relates to a kind of audio system, in particular to a kind of feedback interference low distortion audio frequency broadcast system.
Background technology
With the continuous development of electronic technology, electronics has been popularized, to bringing great convenience.But
The audio output system that existing electronics uses also existing defects, i.e. the sound noise of its output is more, and call is not
It is enough clear, it largely have impact on speech quality.
The content of the invention
It is an object of the invention to overcome the sound noise that audio output system exports more, call not enough clearly lacks
Fall into, there is provided a kind of feedback interference low distortion audio frequency broadcast system.
The purpose of the present invention is achieved through the following technical solutions：A kind of feedback interference low distortion audio frequency broadcast system, including
Amplifier U2, audio receiving module, the bandwidth-limited circuit being connected with audio receiving module, is serially connected in 1 pin and 3 of amplifier U2
Resistance R13 between pin, cathode is connected with 1 pin of amplifier U2, anode sequentially through polar capacitor C6, potentiometer R15 and
The polar capacitor C5 being connected after resistance R14 with 11 pins of amplifier U2, one end is connected with 1 pin of amplifier U2, other end warp
The resistance R17 being connected after resistance R16 with the control terminal of potentiometer R15, one end is connected with 3 pins of amplifier U2, the other end is through electricity
The resistance R11 being connected after resistance R12 with 2 pins of amplifier U2, the low distortion audio amplifier circuit being connected with 1 pin of amplifier U2,
And the loudspeaker BT being connected with low distortion audio amplifier circuit；2 pins of the amplifier U2 and resistance R17 and resistance R16
Tie point connection, 3 pins are connected with bandwidth-limited circuit.
Further, the low distortion audio amplifier circuit includes amplification chip U1, the mistake being connected with amplification chip U1
True to adjust circuit, cathode is connected with 3 pins of amplification chip U1, the polar capacitor C7 of anode ground connection, one end and polar capacitor
The cathode of C7 is connected, the resistance R18 of another termination power；2 pins of the amplification chip U1 are connected with 1 pin of amplifier U2
Connect, distortion adjusts circuit and is then connected with loudspeaker BT.
The distortion, which adjusts circuit, includes triode Q1, triode Q2, and cathode is connected with the emitter of triode Q2, bears
Polar capacitor C9, the P pole that pole is connected with loudspeaker BT is connected with the anode of polar capacitor C9, N poles after resistance R22 with three poles
The diode D3 that the collector of pipe Q2 is connected, one end is connected with 2 pins of amplification chip U1, the other end is through potentiometer R20
The resistance R19 being connected afterwards with the emitter of triode Q2, the capacitance C8 being serially connected between the base stage of triode Q1 and emitter,
The resistance R21 being serially connected between the collector and emitter of triode Q1, cathode is connected with the collector of triode Q1, anode
The polar capacitor C10 of ground connection, and N poles are connected with the collector of triode Q1, the zener diode D2 of P poles ground connection；It is described
The collector of triode Q1 connects power supply, and emitter is connected with the emitter of triode Q2, base stage and the base stage phase of triode Q2
Connection；7 pins of the amplification chip U1 are connected with the collector of triode Q1, and 6 pins are connected with the base stage of triode Q1
Connect, 4 pins ground connection；The grounded collector of the triode Q2, its emitter are connected with the control terminal of potentiometer R20.
The bandwidth-limited circuit includes the second order high-pass filtering circuit being connected with audio receiving module, is serially connected in second order
Second-order low-pass filter circuit between high-pass filtering circuit and 3 pins of amplifier U2.
The second order high-pass filtering circuit includes operational amplifier A 1, and one end is connected with audio receiving module, the other end
Capacitance C1, the P pole being connected after capacitance C2 with the cathode of operational amplifier A 1 is grounded after resistance R3, N poles and capacitance C1 and
The diode D1 that the tie point of capacitance C2 is connected, is serially connected between the N poles of diode D1 and the output terminal of operational amplifier A 1
Resistance R2, the resistance R4 being serially connected between the output terminal of operational amplifier A 1 and the P poles of diode D1, and one end and computing
The cathode of amplifier A1 is connected, the resistance R1 of other end ground connection；The output terminal of the operational amplifier A 1 is filtered with step low-pass
Wave circuit is connected, its anode is connected with the P poles of diode D1.
The second-order low-pass filter circuit includes operational amplifier A 2, and one end is connected with the output terminal of operational amplifier A 1
Connect, the resistance R5 that the other end is connected after resistance R7 with the cathode of operational amplifier A 2, one end is with resistance R5's and resistance R7
The capacitance C4 that tie point is connected, the other end is connected with the output terminal of operational amplifier A 2, the resistance being in parallel with capacitance C4
R8, one end is connected with the cathode of operational amplifier A 2, capacitance C3, the resistance R6 being in parallel with capacitance C3 of other end ground connection,
And the resistance R9 that one end is connected with the output terminal of operational amplifier A 2, the other end is grounded after resistance R10；The computing is put
The anode of big device A2 is connected with the tie point of resistance R9 and resistance R10, its output terminal is then connected with 3 pins of amplifier U2.
The centre frequency of the second order high-pass filtering circuit isThe second-order low-pass filter
The centre frequency of circuit is
The gain A of the second order high-pass filtering circuitF1Equal to the gain A of second-order low-pass filter circuitF2, i.e.,：The gain A of the bandwidth-limited circuitF=AF1AF2。
The cutoff frequency of the bandwidth-limited circuit is 300~3000Hz.
The present invention compared with the prior art, has the following advantages and beneficial effect：
(1) present invention can be isolated the interfering noise outside setting range, effectively eliminate interfering noise, be improved
Communication effect.
(2) present invention can reduce the amplified distortion factor of audio signal, so as to improve communication effect.
(3) interference signal that polar circuit and loudspeaker feedback are returned after the present invention can isolate, so as to improve audio signal
Stability.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Embodiment
The present invention is described in further detail with reference to embodiment, but embodiments of the present invention are not limited to
This.
Embodiment
As shown in Figure 1, the feedback interference low distortion audio frequency broadcast system of the present invention, including amplifier U2, audio receiving module,
The bandwidth-limited circuit being connected with audio receiving module, the resistance R13 being serially connected between 1 pin of amplifier U2 and 3 pins, just
Pole is connected with 1 pin of amplifier U2, anode sequentially after polar capacitor C6, potentiometer R15 and resistance R14 with amplifier U2 11
The polar capacitor C5 that pin is connected, one end is connected with 1 pin of amplifier U2, the other end after resistance R16 with potentiometer R15's
The resistance R17 of control terminal connection, one end is connected with 3 pins of amplifier U2,2 pins of the other end after resistance R12 with amplifier U2
The resistance R11 of connection, the low distortion audio amplifier circuit being connected with 1 pin of amplifier U2, and amplify electricity with low distortion audio
The loudspeaker BT that road is connected.2 pins of the amplifier U2 are connected with the tie point of resistance R17 and resistance R16,3 pins and band
Bandpass filter circuit connects.
Specifically, the audio receiving module is used to receive audio signal, it can be realized using existing antenna.The band logical
The frequency filtering of filter circuit is 300~3000Hz, it effectively can filter interfering noise and retain the audio signal spoken,
So that the sound that the present invention exports becomes apparent from.
In order to filter interference signal, as shown in Figure 1, the bandwidth-limited circuit includes two to be connected with audio receiving module
Rank high-pass filtering circuit, the second-order low-pass filter circuit being serially connected between second order high-pass filtering circuit and 3 pins of amplifier U2.
Specifically, the second order high-pass filtering circuit includes operational amplifier A 1, capacitance C1, capacitance C2, resistance R1, resistance
R2, resistance R3, resistance R4 and diode D1.
During connection, one end of capacitance C1 is connected with audio receiving module, the other end after capacitance C2 with operation amplifier
The cathode of device A1 is connected.The P poles of diode D1 are grounded after resistance R3, N poles are connected with the tie point of capacitance C1 and capacitance C2
Connect.Resistance R2 is serially connected between the N poles of diode D1 and the output terminal of operational amplifier A 1.Resistance R4 is serially connected in operational amplifier
Between the output terminal of A1 and the P poles of diode D1.One end of resistance R1 is connected with the cathode of operational amplifier A 1, another termination
Ground.The output terminal of the operational amplifier A 1 is connected with second-order low-pass filter circuit, its anode is extremely connected with the P of diode D1
Connect.
The audio signal of audio receiving module output inputs to operational amplifier after capacitance C1 and capacitance C2 are filtered
A1, the operational amplifier A 1, capacitance C1, capacitance C2, resistance R4 and resistance R3 are collectively forming high-pass filter；The operation amplifier
Device A1 is negative-feedback, it can be with the gain of stabilizing circuit.The centre frequency of the second order high-pass filtering circuit isIn the present embodiment, the capacitance of capacitance C1 and capacitance C2 are 0.068 μ F, resistance R1 and electricity
The resistance value for hindering R2 is 8.2K Ω；It can be drawn by above-mentioned formula, the centre frequency f of second order high-pass filtering circuit in the present embodiment1
=286Hz.In addition, the model 14001 of diode D1, the resistance value of resistance R4 is 27K Ω, and the resistance value of resistance R3 is 47K Ω, fortune
Calculate the model OP07 of amplifier A1.The audio signal that operational amplifier A 1 exports is input to second-order low-pass filter circuit.
As shown in Figure 1, the second-order low-pass filter circuit includes operational amplifier A 2, resistance R5, resistance R7, resistance R6, electricity
Hinder R8, resistance R9, resistance R10, capacitance C3 and capacitance C4.During specific connection, one end and the operational amplifier A 1 of resistance R5
Output terminal be connected, cathode of the other end with operational amplifier A 2 after resistance R7 is connected.One end of capacitance C4 and resistance
The tie point of R5 and resistance R7 are connected, the other end is connected with the output terminal of operational amplifier A 2.Resistance R8 and capacitance C4 phases
It is in parallel.One end of capacitance C3 is connected with the cathode of operational amplifier A 2, other end ground connection.Resistance R6 is in parallel with capacitance C3.
One end of resistance R9 is connected with the output terminal of operational amplifier A 2, the other end is grounded after resistance R10.The operational amplifier
The anode of A2 is connected with the tie point of resistance R9 and resistance R10, its output terminal is then connected with 3 pins of amplifier U2.
The audio signal that operational amplifier A 1 exports inputs to operational amplifier A 2, while electricity after resistance R5 and resistance R7
Audio signal can be filtered by holding C3 and capacitance C4；The operational amplifier A 2, resistance R5, resistance R7, capacitance C3, resistance R6,
Capacitance C4 and resistance R8 are collectively forming low-pass filter.Operational amplifier A 2 is also negative-feedback, it can be with the increasing of stabilizing circuit
Benefit.The centre frequency of the second-order low-pass filter circuit isIn the present embodiment, resistance R5 and
The resistance value of resistance R7 is that the capacitance of 8.2K Ω, capacitance C3 and capacitance C4 are 0.0068 μ F；It can be drawn by above-mentioned formula, this reality
Apply the centre frequency f of second-order low-pass filter circuit in example2=2856Hz.In addition, the resistance value of resistance R6 is 10K Ω, resistance R8
Resistance value be 1K Ω, the resistance value of resistance R9 is 27K Ω, and the resistance value of resistance R10 is 47K Ω, the model of operational amplifier A 2
OP07。
Obtained by above-mentioned, the cutoff frequency of the bandwidth-limited circuit of the present embodiment is 286Hz~2856Hz, so that effectively
Interference signal beyond one's voice in speech frequency signal is isolated, improves speech quality.
In addition, the gain A of the second order high-pass filtering circuitF1Equal to the gain A of second-order low-pass filter circuitF2, i.e.,：The gain A of the bandwidth-limited circuitF=AF1AF2。
In addition, the amplifier U2, polar capacitor C5, polar capacitor C6, resistance R17, resistance R16, potentiometer R15 and resistance
R14 is collectively forming an isolation buffers；The isolation buffers can isolate rear class low distortion audio amplifier circuit and loudspeaker
The feedback interference signal of BT, so as to improve the stability of system.In the present embodiment, the model LM324 of amplifier U2, polarity electricity
The capacitance for holding C5 is 1 μ F, and the capacitance of polar capacitor C6 is 4.7 μ F, and the resistance value of resistance R17 is 10K Ω, and the resistance value of resistance R16 is
The resistance value of 100K Ω, potentiometer R15 are 10K Ω, and the resistance value of resistance R14 is 4.7K Ω, and the resistance value of resistance R12 is 100K Ω, electricity
The resistance value for hindering R11 is 4.7K Ω, and the resistance value of resistance R13 is 22K Ω.Audio signal is exported to low distortion from 1 pin of amplifier U2
Audio amplifier circuit.
The low distortion audio amplifier circuit includes amplification chip U1, and the distortion being connected with amplification chip U1 adjusts circuit,
Cathode is connected with 3 pins of amplification chip U1, the polar capacitor C7 of anode ground connection, and one end is connected with the cathode of polar capacitor C7
Connect, the resistance R18 of another termination power.2 pins of the amplification chip U1 are connected with the output terminal of operational amplifier A 2, lose
The true circuit that adjusts then is connected with loudspeaker BT.
Polar capacitor C7 can be filtered input voltage processing, amplification chip U1 work is more stablized；The electricity
Resistance R18 plays partial pressure, and the resistance value of resistance R18 is 10K Ω, and the capacitance of polar capacitor C7 is 0.1 μ F,
In addition, the distortion, which adjusts circuit, includes triode Q1, triode Q2, resistance R19, potentiometer R20, zener diode
D2, capacitance C8, resistance R22, polar capacitor C9, polar capacitor C10, resistance R21 and diode D3.
Wherein, the cathode of polar capacitor C9 is connected with the emitter of triode Q2, anode and loudspeaker BT are connected.Two
The P poles of pole pipe D3 are connected with the anode of polar capacitor C9, collector of the N poles with triode Q2 after resistance R22 is connected.Electricity
One end of resistance R19 is connected with 2 pins of amplification chip U1, emitter phase of the other end after potentiometer R20 with triode Q2
Connection.Capacitance C8 is serially connected between base stage and the emitter of triode Q1.Resistance R21 is serially connected in the collector and hair of triode Q1
Between emitter-base bandgap grading.The cathode of polar capacitor C10 is connected with the collector of triode Q1, anode ground connection.The N poles of zener diode D2
It is connected with the collector of triode Q1, P poles ground connection.
The collector of the triode Q1 connects power supply, and emitter is connected with the emitter of triode Q2, base stage and three poles
The base stage of pipe Q2 is connected.7 pins of the amplification chip U1 are connected with the collector of triode Q1,6 pins and triode
The base stage of Q1 is connected, and 4 pins ground connection, 2 pins are connected with 1 pin of amplifier U2.The grounded collector of the triode Q2, its
Emitter is connected with the control terminal of potentiometer R20.
Triode Q1 and triode Q2 forms complementary structure, and amplification chip is then formed with reference to potentiometer R20 and resistance R19
The backfeed loop of U1, this structure can reduce the distortion that signal occurs in transmitting procedure.Capacitance C8 can be played a filtering role,
Its capacitance is 0.1 μ F.The gain ranging that the distortion adjusts circuit can be adjusted by adjusting potentiometer R20.Polar capacitor C10 can be to defeated
Enter voltage to be filtered, zener diode D2 can carry out voltage stabilizing to voltage, to improve the stability of amplification chip U1.The resistance
The resistance value of R19 is 1K Ω, and the resistance value of potentiometer R20 is 20K Ω, and the resistance value of resistance R22 is 10K Ω, and the resistance value of resistance R21 is
The capacitance of 100K Ω, capacitance C8 are 0.1 μ F, and the capacitance of polar capacitor C9 is 4.7 μ F, and the capacitance of polar capacitor C10 is 470 μ F,
The model LM74 of the model 1N4742 of the model 1N4003 of diode D3, zener diode D2, amplification chip U1.
The audio signal of second order high-pass filtering circuit output is input to after amplification chip U1 is amplified processing, from amplification core
The 6 pins output of piece U1, and drive after the complementary triode Q1 and triode Q2 set drive the speaker BT sounding again.
As described above, the present invention can be realized well.
Claims (9)
- A kind of 1. feedback interference low distortion audio frequency broadcast system, it is characterised in that：Including amplifier U2, audio receiving module, with sound The bandwidth-limited circuit that frequency receiving module is connected, the resistance R13 being serially connected between 1 pin of amplifier U2 and 3 pins, cathode with The 1 pin connection of amplifier U2, anode sequentially 11 pins after polar capacitor C6, potentiometer R15 and resistance R14 with amplifier U2 The polar capacitor C5 being connected, one end is connected with 1 pin of amplifier U2, control of the other end after resistance R16 with potentiometer R15 The resistance R17 of connection is held, one end is connected with 3 pins of amplifier U2, the other end is connected after resistance R12 with 2 pins of amplifier U2 Resistance R11, the low distortion audio amplifier circuit being connected with 1 pin of amplifier U2, and with low distortion audio amplifier circuit phase The loudspeaker BT of connection；2 pins of the amplifier U2 are connected with the tie point of resistance R17 and resistance R16,3 pins and band logical are filtered Wave circuit connects.
- A kind of 2. feedback interference low distortion audio frequency broadcast system according to claim 1, it is characterised in that：The low distortion Audio amplifier circuit includes amplification chip U1, and the distortion being connected with amplification chip U1 adjusts circuit, cathode and amplification chip U1 3 pins be connected, anode ground connection polar capacitor C7, one end is connected with the cathode of polar capacitor C7, another termination power Resistance R18；2 pins of the amplification chip U1 are connected with 1 pin of amplifier U2, distortion adjust circuit then with loudspeaker BT Connection.
- A kind of 3. feedback interference low distortion audio frequency broadcast system according to claim 2, it is characterised in that：The distortion tune Economize on electricity road includes triode Q1, triode Q2, and cathode is connected with the emitter of triode Q2, anode and loudspeaker BT are connected Polar capacitor C9, P pole is connected with the anode of polar capacitor C9, collector of the N poles with triode Q2 after resistance R22 is connected Diode D3, one end is connected with 2 pins of amplification chip U1, transmitting of the other end after potentiometer R20 with triode Q2 The resistance R19 that pole is connected, the capacitance C8 being serially connected between the base stage of triode Q1 and emitter, are serially connected in the collection of triode Q1 Resistance R21 between electrode and emitter, cathode is connected with the collector of triode Q1, the polar capacitor C10 of anode ground connection, And N poles are connected with the collector of triode Q1, the zener diode D2 of P poles ground connection；The collector of the triode Q1 connects Power supply, emitter are connected with the emitter of triode Q2, and base stage is connected with the base stage of triode Q2；The amplification chip U1 7 pins be connected with the collector of triode Q1,6 pins are connected with the base stage of triode Q1,4 pins ground connection；Described three The grounded collector of pole pipe Q2, its emitter are connected with the control terminal of potentiometer R20.
- A kind of 4. feedback interference low distortion audio frequency broadcast system according to claim 3, it is characterised in that：The band logical filter Wave circuit includes the second order high-pass filtering circuit being connected with audio receiving module, is serially connected in second order high-pass filtering circuit and amplifier Second-order low-pass filter circuit between 3 pins of U2.
- A kind of 5. feedback interference low distortion audio frequency broadcast system according to claim 4, it is characterised in that：The second order is high Bandpass filter circuit includes operational amplifier A 1, and one end is connected with audio receiving module, the other end is put after capacitance C2 with computing Capacitance C1, the P pole that the cathode of big device A1 is connected is grounded after resistance R3, N poles are connected with the tie point of capacitance C1 and capacitance C2 The diode D1 connect, the resistance R2 being serially connected between the N poles of diode D1 and the output terminal of operational amplifier A 1, is serially connected in computing Resistance R4 between the output terminal of amplifier A1 and the P poles of diode D1, and one end are connected with the cathode of operational amplifier A 1 Connect, the resistance R1 of other end ground connection；The output terminal of the operational amplifier A 1 is connected with second-order low-pass filter circuit, its anode It is connected with the P poles of diode D1.
- A kind of 6. feedback interference low distortion audio frequency broadcast system according to claim 5, it is characterised in that：The second order is low Bandpass filter circuit includes operational amplifier A 2, and one end is connected with the output terminal of operational amplifier A 1, the other end is after resistance R7 The resistance R5 being connected with the cathode of operational amplifier A 2, one end is connected with the tie point of resistance R5 and resistance R7, the other end The capacitance C4 being connected with the output terminal of operational amplifier A 2, the resistance R8 being in parallel with capacitance C4, one end and operational amplifier The cathode of A2 is connected, capacitance C3, the resistance R6 being in parallel with capacitance C3 of other end ground connection, and one end and operational amplifier The resistance R9 that the output terminal of A2 is connected, the other end is grounded after resistance R10；The anode of the operational amplifier A 2 and resistance R9 It is connected with the tie point of resistance R10, its output terminal is then connected with 3 pins of amplifier U2.
- A kind of 7. feedback interference low distortion audio frequency broadcast system according to claim 6, it is characterised in that：The second order is high The centre frequency of bandpass filter circuit isThe centre frequency of the second-order low-pass filter circuit is
- A kind of 8. feedback interference low distortion audio frequency broadcast system according to claim 7, it is characterised in that：The second order is high The gain A of bandpass filter circuitF1Equal to the gain A of second-order low-pass filter circuitF2, i.e.,：The band The gain A of bandpass filter circuitF=AF1AF2。
- A kind of 9. feedback interference low distortion audio frequency broadcast system according to claim 8, it is characterised in that：The band logical filter The cutoff frequency of wave circuit is 300~3000Hz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810007529.4A CN107948866B (en) | 2018-01-04 | 2018-01-04 | Feedback interference low-distortion audio playing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810007529.4A CN107948866B (en) | 2018-01-04 | 2018-01-04 | Feedback interference low-distortion audio playing system |
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| CN107948866A true CN107948866A (en) | 2018-04-20 |
| CN107948866B CN107948866B (en) | 2023-09-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107948867A (en) * | 2018-01-04 | 2018-04-20 | 成都威邦科技有限公司 | Bandpass filtering audio frequency broadcast system based on feedback interference |
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| CN1811487A (en) * | 2006-03-08 | 2006-08-02 | 中南大学 | Preamplification and filtering circuit for precision isolated amplifier |
| CN204046585U (en) * | 2014-09-05 | 2014-12-24 | 国家电网公司 | A kind of AM receiving circuitry |
| CN105848060A (en) * | 2016-05-28 | 2016-08-10 | 成都聚汇才科技有限公司 | Audio signal processing system based on audio frequency modulation circuit |
| CN208402103U (en) * | 2018-01-04 | 2019-01-18 | 成都威邦科技有限公司 | A kind of feedback interference low distortion audio frequency broadcast system |
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| US5410273A (en) * | 1993-11-01 | 1995-04-25 | Advanced Micro Devices | Low distortion operational amplifier |
| CN1811487A (en) * | 2006-03-08 | 2006-08-02 | 中南大学 | Preamplification and filtering circuit for precision isolated amplifier |
| CN204046585U (en) * | 2014-09-05 | 2014-12-24 | 国家电网公司 | A kind of AM receiving circuitry |
| CN105848060A (en) * | 2016-05-28 | 2016-08-10 | 成都聚汇才科技有限公司 | Audio signal processing system based on audio frequency modulation circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107948867A (en) * | 2018-01-04 | 2018-04-20 | 成都威邦科技有限公司 | Bandpass filtering audio frequency broadcast system based on feedback interference |
| CN107948867B (en) * | 2018-01-04 | 2024-04-09 | 成都威邦科技有限公司 | Band-pass filtering audio playing system based on feedback interference |
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| CN107948866B (en) | 2023-09-29 |
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