CN208061666U - A kind of voltage follow low distortion audio frequency broadcast system - Google Patents
A kind of voltage follow low distortion audio frequency broadcast system Download PDFInfo
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- CN208061666U CN208061666U CN201820014274.XU CN201820014274U CN208061666U CN 208061666 U CN208061666 U CN 208061666U CN 201820014274 U CN201820014274 U CN 201820014274U CN 208061666 U CN208061666 U CN 208061666U
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Abstract
The utility model discloses a kind of voltage follow low distortion audio frequency broadcast systems, it is characterised in that：Including audio receiving module, the bandwidth-limited circuit being connected with audio receiving module, the signal being connected with bandwidth-limited circuit follows circuit, follows the low distortion audio amplifier circuit that circuit is connected with signal, and the loud speaker BT being connected with audio amplifier circuit.The interfering noise outside setting range can be isolated for the utility model, effectively eliminate interfering noise, improve communication effect.The utility model can reduce the amplified distortion factor of audio signal, to improve communication effect.The signal of the utility model follows circuit to can be very good the signal transmission between buffering prime and rear class, improves the stability of audio signal.
Description
Technical field
The utility model is related to a kind of audio system, in particular to a kind of voltage follow low distortion audio frequency broadcast systems.
Background technology
With the continuous development of electronic technology, electronics has been popularized, to bringing great convenience.However
There is also defects for the audio output system that existing electronics uses, i.e. the sound noise of its output is more, and call is not
It is enough clear, largely affect speech quality.
Utility model content
The sound noise exported the purpose of the utility model is to overcome audio output system is more, and call is not enough clearly
Defect provides a kind of voltage follow low distortion audio frequency broadcast system.
The purpose of this utility model is achieved through the following technical solutions：A kind of voltage follow low distortion audio frequency broadcast system,
Including audio receiving module, the bandwidth-limited circuit being connected with audio receiving module, the letter being connected with bandwidth-limited circuit
Number circuit is followed, follows the low distortion audio amplifier circuit that circuit is connected with signal, and be connected with audio amplifier circuit
Loud speaker BT；It includes field-effect tube MOS that the signal, which follows circuit, anode be connected with the source electrode of field-effect tube MOS, cathode
The polar capacitor C8 being connected with low distortion audio amplifier circuit, one end is connected with the anode of polar capacitor C8, another termination
The resistance R14 on ground, cathode is connected with the anode of polar capacitor C8, anode after resistance R13 with the grid phase of field-effect tube MOS
The polar capacitor pole C7, N of connection is connected with the anode of polar capacitor C7, two that the poles P are connected with the grid of field-effect tube MOS
Pole pipe D3, the diode D2 being in parallel with diode D3, cathode is connected with the grid of field-effect tube MOS, anode is filtered with band logical
The polar capacitor C5 that wave circuit is connected, the capacitance C6 that one end is connected with the drain electrode of field-effect tube MOS, the other end is grounded, string
The resistance R11 being connected between the drain electrode of field-effect tube MOS and the anode of polar capacitor C7 and one end and polar capacitor C7 are just
The resistance R12 that pole is connected, the other end is grounded.
The low distortion amplifier circuit includes amplification chip U1, and the distortion being connected with amplification chip U1 adjusts circuit, just
The polar capacitor C9 that pole is connected with 3 pins of amplification chip U1, cathode is grounded, one end is connected with the anode of polar capacitor C9
It connects, the resistance R15 of another termination power；2 pins of the amplification chip U1 are connected with the cathode of polar capacitor C8, and distortion is adjusted
Economize on electricity Lu Zeyu loud speakers BT connections.
Further, it includes triode Q1, triode Q2, the emitter of anode and triode Q2 that the distortion, which adjusts circuit,
It is connected, the cathode and polar capacitor pole C11, P of loud speaker BT connections is connected with the cathode of polar capacitor C11, the poles N are through resistance
The diode D5 being connected with the collector of triode Q2 after R18, one end is connected with 2 pins of amplification chip U1, the other end
The resistance R16 being connected with the emitter of triode Q2 after potentiometer R17, be serially connected in triode Q1 base stage and emitter it
Between capacitance C10, the resistance R19 being serially connected between the collector and emitter of triode Q1, anode and the current collection of triode Q1
Pole is connected, the poles polar capacitor C12 and N of cathode ground connection are connected with the collector of triode Q1, the voltage stabilizing of the poles P ground connection
Diode D4；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 connect with the cathode of polar capacitor C8；The collector of the triode Q2 connects
Ground, emitter are connected with the control terminal of potentiometer R17.
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 the anode of polar capacitor C5.
The second order high-pass filtering circuit includes operational amplifier A 1, and one end is connected with audio receiving module, the other end
The capacitance pole C1, P being connected with the anode of operational amplifier A 1 after capacitance C2 is grounded after resistance R3, the poles N and capacitance C1 and
The diode D1 that the tie point of capacitance C2 is connected, is serially connected between the poles N of diode D1 and the output end of operational amplifier A 1
Resistance R2, the resistance R4 being serially connected between the output end of operational amplifier A 1 and the poles P of diode D1 and one end and operation
The resistance R1 that the anode of amplifier A1 is connected, the other end is grounded；The output end of the operational amplifier A 1 is filtered with step low-pass
Wave circuit is connected, and cathode is connected with the poles P of diode D1.
The second-order low-pass filter circuit includes operational amplifier A 2, and one end is connected with the output end of operational amplifier A 1
It connects, the resistance R5 that the other end is connected after resistance R7 with the anode 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 end of operational amplifier A 2, the resistance being in parallel with capacitance C4
R8, capacitance C3, the resistance R6 being in parallel with capacitance C3 that one end is connected with the anode of operational amplifier A 2, the other end is grounded,
And the resistance R9 that one end is connected with the output end of operational amplifier A 2, the other end is grounded after resistance R10；The operation is put
The cathode of big device A2 is connected with the tie point of resistance R9 and resistance R10, its output end is then connected with the anode of polar capacitor C5
It connects.
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 utility model compared with the prior art, has the following advantages and advantageous effect：
(1) interfering noise outside setting range can be isolated for the utility model, effectively eliminate interfering noise,
Improve communication effect.
(2) the utility model can reduce the amplified distortion factor of audio signal, to improve communication effect.
(3) signal of the utility model follows circuit to can be very good the signal transmission between buffering prime and rear class, carries
The stability of high audio signal.
Description of the drawings
Fig. 1 is the overall structure diagram of the utility model.
Specific implementation mode
The utility model is described in further detail with reference to embodiment, but the embodiment of the utility model is simultaneously
It is without being limited thereto.
Embodiment
As shown in Figure 1, the voltage follow low distortion audio frequency broadcast system of the utility model, including audio receiving module, with
The bandwidth-limited circuit that audio receiving module is connected, the signal being connected with bandwidth-limited circuit follow circuit, with signal with
The low distortion audio amplifier circuit being connected with circuit, and the loud speaker BT that is connected with audio amplifier circuit.
Specifically, existing antenna can be used to realize for receiving audio signal in the audio receiving module.The band logical
The frequency filtering of filter circuit is 300~3000Hz, effectively can filter interfering noise and retain the audio signal spoken,
To which the sound for making the utility model export is more clear.
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, is serially connected in second order high-pass filtering circuit and signal follows second-order low-pass filter circuit between circuit.
Specifically, the second order high-pass filtering circuit includes operational amplifier A 1, and capacitance C1, capacitance C2, resistance R1, resistance
R2, resistance R3, resistance R4 and diode D1.
When connection, one end of capacitance C1 is connected with audio receiving module, the other end after capacitance C2 with operation amplifier
The anode of device A1 is connected.The poles P of diode D1 are grounded after resistance R3, the poles N are connected with the tie point of capacitance C1 and capacitance C2
It connects.Resistance R2 is serially connected between the poles N of diode D1 and the output end of operational amplifier A 1.Resistance R4 is serially connected in operational amplifier
Between the output end of A1 and the poles P of diode D1.One end of resistance R1 is connected with the anode of operational amplifier A 1, another termination
Ground.The output end of the operational amplifier A 1 is connected with second-order low-pass filter circuit, and cathode is extremely connected with the P of diode D1
It connects.
The audio signal of audio receiving module output inputs to operational amplifier A 1 after capacitance C1 and capacitance C2 are filtered,
High-pass filter is collectively formed in the operational amplifier A 1, capacitance C1, capacitance C2, resistance R4 and resistance R3；The operational amplifier A 1
It, can be with the gain of stabilizing circuit for negative-feedback.The centre frequency of the second order high-pass filtering circuit is
In the present embodiment, it is 8.2K that the capacitance of capacitance C1 and capacitance C2, which are the resistance value of 0.068 μ F, resistance R1 and resistance R2,
Ω；It can be obtained by above-mentioned formula, the centre frequency f of second order high-pass filtering circuit in the present embodiment1=286Hz.In addition, diode
The resistance value of the model 14001 of D1, resistance R4 is 27K Ω, and the resistance value of resistance R3 is 47K Ω, the model of operational amplifier A 1
OP07.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, and resistance R5, resistance R7, resistance R6, electricity
Hinder R8, resistance R9, resistance R10, capacitance C3 and capacitance C4.When specific connection, one end and the operational amplifier A 1 of resistance R5
Output end be connected, the other end is connected after resistance R7 with the anode of operational amplifier A 2.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 end of operational amplifier A 2.Resistance R8 and capacitance C4 phases
It is in parallel.One end of capacitance C3 is connected with the anode of operational amplifier A 2, the other end is grounded.Resistance R6 is in parallel with capacitance C3.
One end of resistance R9 is connected with the output end of operational amplifier A 2, the other end is grounded after resistance R10.The operational amplifier
The cathode of A2 is connected with the tie point of resistance R9 and resistance R10, its output end then follows circuit to be connected with signal.
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,
Low-pass filter is collectively formed in capacitance C4 and resistance R8.Operational amplifier A 2 is also negative-feedback, 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 obtained 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。
It is obtained by above-mentioned, the cutoff frequency of the bandwidth-limited circuit of the present embodiment is 286Hz~2856Hz, to effective
Interference signal other than one's voice in speech frequency signal is isolated, speech quality is improved.
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。
It includes field-effect tube MOS, polar capacitor C5, diode D2, diode D3, resistance R11, electricity that the signal, which follows circuit,
Hinder R12, resistance R13, capacitance C6, polar capacitor C7, resistance R14, polar capacitor C8.
The anode of polar capacitor C8 is connected with the source electrode of field-effect tube MOS, cathode is connected with audio amplifier circuit.
One end of resistance R14 is connected with the anode of polar capacitor C8, the other end is grounded.The cathode of polar capacitor C7 and polar capacitor C8
Anode be connected, anode be connected with the grid of field-effect tube MOS after resistance R13.The poles N of diode D3 and polar capacitor
The anode of C7 is connected, the poles P are connected with the grid of field-effect tube MOS.Diode D2 is in parallel with diode D3.Polar capacitor
The cathode of C5 is connected with the grid of field-effect tube MOS, anode is connected with bandwidth-limited circuit.It is imitated with field one end of capacitance C6
Should pipe MOS drain electrode be connected, the other end ground connection.Resistance R11 be serially connected in field-effect tube MOS drain electrode and polar capacitor C7 just
Between pole.One end of resistance R12 is connected with the anode of polar capacitor C7, the other end is grounded.
Polar capacitor C7 and resistance R13 forms the compensation biasing circuit of field-effect tube MOS, and field-effect tube can be improved
The stability of MOS；A follower is collectively formed in capacitance C7, resistance R13 and field-effect tube MOS, which can carry
High input impedance, and output impedance is reduced, to improve the load capacity for improving output end；In addition the follower can also improve
The stability of audio signal；The capacitance of the model MPF102 of field-effect tube MOS, polar capacitor C7 are 1 μ F, resistance R13's
Resistance value is 3.3M Ω.The conducting speed of field-effect tube MOS, model 1N4002 can be improved in diode D3.Capacitance C6 plays filtering
Effect, keeps the voltage in input circuit more stable, and capacitance is 10 μ F.Resistance R11 and resistance R12 play partial pressure, the resistance
The resistance value of R11 is 270K Ω, and the resistance value of resistance R12 is 150K Ω.In the present embodiment, the capacitance of polar capacitor C5 is 0.01
The resistance value of the model 1N4001 of μ F, diode D2, resistance R14 are 4.7K Ω, and the capacitance of polar capacitor C8 is 10 μ F.
The low distortion amplifier circuit includes amplification chip U1, and the distortion being connected with amplification chip U1 adjusts circuit, anode
It is connected with 3 pins of amplification chip U1, the polar capacitor C9 of cathode ground connection, one end is connected with the anode of polar capacitor C9,
The resistance R15 of another termination 12V power supplys.2 pins of the amplification chip U1 are connected with the cathode of polar capacitor C8, and distortion is adjusted
Economize on electricity Lu Zeyu loud speakers BT connections.
Polar capacitor C9 can be filtered input voltage, and amplification chip U1 work is made more to stablize；The electricity
Resistance R15 plays partial pressure, and the resistance value of resistance R15 is 10K Ω, and the capacitance of polar capacitor C9 is 0.1 μ F,
In addition, it includes triode Q1, triode Q2, resistance R16, potentiometer R17, zener diode that the distortion, which adjusts circuit,
D4, capacitance C10, resistance R19, polar capacitor C11, polar capacitor C12, resistance R18 and diode D5.
Wherein, the anode of polar capacitor C11 is connected with the emitter of triode Q2, cathode and loud speaker BT are connect.
The poles P of diode D5 are connected with the cathode of polar capacitor C11, the poles N are connected after resistance R18 with the collector of triode Q2
It connects.One end of resistance R16 is connected with 2 pins of amplification chip U1, transmitting of the other end after potentiometer R17 with triode Q2
Pole is connected.Capacitance C10 is serially connected between the base stage and emitter of triode Q1.Resistance R19 is serially connected in the current collection of triode Q1
Between pole and emitter.The anode of polar capacitor C12 is connected with the collector of triode Q1, cathode is grounded.Zener diode
The poles N of D4 are connected with the collector of triode Q1, the poles P are grounded.
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 connect with the cathode of polar capacitor C8.The collector of the triode Q2 connects
Ground, emitter are connected with the control terminal of potentiometer R17.
Triode Q1 and triode Q2 form complementary structure, and amplification chip is then formed in conjunction with potentiometer R17 and resistance R16
The backfeed loop of U1, this structure can reduce the distortion that signal occurs in transmission process.Capacitance C10 can play filtering and make
With capacitance is 0.1 μ F.The gain ranging that the distortion adjusts circuit can be adjusted by adjusting potentiometer R17.Polar capacitor C12 can
Input voltage is filtered, zener diode D4 can carry out voltage stabilizing to voltage, to improve the stability of amplification chip U1.The electricity
The resistance value for hindering R16 is 1K Ω, and the resistance value of potentiometer R17 is 20K Ω, and the resistance value of resistance R18 is 10K Ω, and the resistance value of resistance R19 is
The capacitance of 100K Ω, capacitance C10 are 0.1 μ F, and the capacitance of polar capacitor C11 is 4.7 μ F, and the capacitance of polar capacitor C12 is 470 μ
The model LM74 of the model 1N4742 of the model 1N4003 of F, diode D5, zener diode D4, 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
6 pins of piece U1 export, and drive the speaker BT sounding again after the triode Q1 and triode Q2 for driving complementation to be arranged.
As described above, the utility model can be realized well.
Claims (8)
1. a kind of voltage follow low distortion audio frequency broadcast system, it is characterised in that：Including audio receiving module, mould is received with audio
The bandwidth-limited circuit that block is connected, the signal being connected with bandwidth-limited circuit follow circuit, follow circuit to be connected with signal
The low distortion audio amplifier circuit connect, and the loud speaker BT that is connected with audio amplifier circuit；The signal follows circuit packet
Field-effect tube MOS is included, anode is connected with the source electrode of field-effect tube MOS, cathode is connected with low distortion audio amplifier circuit
Polar capacitor C8, the resistance R14 that one end is connected with the anode of polar capacitor C8, the other end is grounded, cathode and polar capacitor C8
Anode be connected, the polar capacitor pole C7, N that is connected with the grid of field-effect tube MOS after resistance R13 of anode and polarity electricity
Hold C7 anode be connected, the diode D3 that the poles P are connected with the grid of field-effect tube MOS, two to be in parallel with diode D3
Pole pipe D2, cathode is connected with the grid of field-effect tube MOS, anode is connected with bandwidth-limited circuit polar capacitor C5, one
The capacitance C6 that end is connected with the drain electrode of field-effect tube MOS, the other end is grounded, is serially connected in drain electrode and the polarity of field-effect tube MOS
The resistance that resistance R11 and one end between the anode of capacitance C7 are connected with the anode of polar capacitor C7, the other end is grounded
R12；
The low distortion amplifier circuit includes amplification chip U1, and the distortion that is connected with amplification chip U1 adjusts circuit, anode with
The polar capacitor C9 that 3 pins of amplification chip U1 are connected, cathode is grounded, one end is connected, separately with the anode of polar capacitor C9
The resistance R15 of one termination power；2 pins of the amplification chip U1 are connected with the cathode of polar capacitor C8, and distortion adjusts electricity
The BT connections of Lu Zeyu loud speakers.
2. a kind of voltage follow low distortion audio frequency broadcast system according to claim 1, it is characterised in that：The distortion is adjusted
Economize on electricity road includes triode Q1, triode Q2, and anode is connected with the emitter of triode Q2, cathode and loud speaker BT are connect
The polar capacitor pole C11, P is connected with the cathode of polar capacitor C11, the poles N are connected after resistance R18 with the collector of triode Q2
The diode D5 connect, one end is connected with 2 pins of amplification chip U1, hair of the other end after potentiometer R17 with triode Q2
The resistance R16 that emitter-base bandgap grading is connected, the capacitance C10 being serially connected between the base stage and emitter of triode Q1, is serially connected in triode Q1
Collector and emitter between resistance R19, anode be connected with the collector of triode Q1, cathode be grounded polar capacitor
The zener diode D4 that the poles C12 and N are connected with the collector of triode Q1, the poles P are grounded；The current collection of the triode Q1
Pole connects power supply, and emitter is connected with the emitter of triode Q2, and base stage is connected with the base stage of triode Q2；The amplification core
7 pins of piece U1 are connected with the collector of triode Q1, and 6 pins are connected with the base stage of triode Q1,4 pins ground connection, 2 pipes
Foot is connect with the cathode of polar capacitor C8；The grounded collector of the triode Q2, the control terminal of emitter and potentiometer R17
It is connected.
3. a kind of voltage follow low distortion audio frequency broadcast system according to claim 2, 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 polarity
Second-order low-pass filter circuit between the anode of capacitance C5.
4. a kind of voltage follow low distortion audio frequency broadcast system according to claim 3, 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 operation
The capacitance pole C1, P that the anode of big device A1 is connected is grounded after resistance R3, the poles N are connected with the tie point of capacitance C1 and capacitance C2
The diode D1 connect, the resistance R2 being serially connected between the poles N of diode D1 and the output end of operational amplifier A 1, is serially connected in operation
Resistance R4 and one end between the output end of amplifier A1 and the poles P of diode D1 are connected with the anode of operational amplifier A 1
It connects, the resistance R1 of other end ground connection；The output end of the operational amplifier A 1 is connected with second-order low-pass filter circuit, cathode
It is connected with the poles P of diode D1.
5. a kind of voltage follow low distortion audio frequency broadcast system according to claim 4, 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 end of operational amplifier A 1, the other end is after resistance R7
The resistance R5 being connected with the anode 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 end of operational amplifier A 2, the resistance R8 being in parallel with capacitance C4, one end and operational amplifier
The capacitance C3 that the anode of A2 is connected, the other end is grounded, the resistance R6 being in parallel with capacitance C3 and one end and operational amplifier
The resistance R9 that the output end of A2 is connected, the other end is grounded after resistance R10；The cathode of the operational amplifier A 2 and resistance R9
It is connected with the tie point of resistance R10, its output end is then connected with the anode of polar capacitor C5.
6. a kind of voltage follow low distortion audio frequency broadcast system according to claim 5, 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。
7. a kind of voltage follow low distortion audio frequency broadcast system according to claim 6, 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。
8. a kind of voltage follow low distortion audio frequency broadcast system according to claim 7, it is characterised in that：The band logical filter
The cutoff frequency of wave circuit is 300~3000Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820014274.XU CN208061666U (en) | 2018-01-04 | 2018-01-04 | A kind of voltage follow low distortion audio frequency broadcast system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820014274.XU CN208061666U (en) | 2018-01-04 | 2018-01-04 | A kind of voltage follow low distortion audio frequency broadcast system |
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| CN208061666U true CN208061666U (en) | 2018-11-06 |
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| CN201820014274.XU Expired - Fee Related CN208061666U (en) | 2018-01-04 | 2018-01-04 | A kind of voltage follow low distortion audio frequency broadcast system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108010543A (en) * | 2018-01-04 | 2018-05-08 | 成都威邦科技有限公司 | A kind of voltage follow low distortion audio frequency broadcast system |
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2018
- 2018-01-04 CN CN201820014274.XU patent/CN208061666U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108010543A (en) * | 2018-01-04 | 2018-05-08 | 成都威邦科技有限公司 | A kind of voltage follow low distortion audio frequency broadcast system |
| CN108010543B (en) * | 2018-01-04 | 2024-02-23 | 澜邦科技(成都)集团有限公司 | Voltage following low-distortion audio playing system |
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Granted publication date: 20181106 Termination date: 20190104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |