CN207895428U - Audio frequency broadcast system based on voltage follow - Google Patents
Audio frequency broadcast system based on voltage follow Download PDFInfo
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- CN207895428U CN207895428U CN201820014273.5U CN201820014273U CN207895428U CN 207895428 U CN207895428 U CN 207895428U CN 201820014273 U CN201820014273 U CN 201820014273U CN 207895428 U CN207895428 U CN 207895428U
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Abstract
The utility model discloses a kind of audio frequency broadcast systems based on voltage follow, 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 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 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 audio frequency broadcast systems based on voltage follow.
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 audio frequency broadcast system based on voltage follow.
The purpose of this utility model is achieved through the following technical solutions：Audio frequency broadcast system based on voltage follow, including
Audio receiving module, the bandwidth-limited circuit being connected with audio receiving module, the signal being connected with bandwidth-limited circuit with
With circuit, the audio amplifier circuit that circuit is connected is followed with signal, and the loud speaker BT being connected with audio amplifier circuit；
It includes field-effect tube MOS that the signal, which follows circuit, and anode is connected with the source electrode of field-effect tube MOS, cathode and audio are amplified
The polar capacitor C8 that circuit is connected, the resistance R14 that one end is connected with the anode of polar capacitor C8, the other end is grounded, cathode
It is connected with the anode of polar capacitor C8, the polar capacitor that anode is connected after resistance R13 with the grid of field-effect tube MOS
The diode D4 that the pole C7, N is connected with the anode of polar capacitor C7, the poles P are connected with the grid of field-effect tube MOS, with two poles
The diode D3 that pipe D4 is in parallel, cathode is connected with the grid of field-effect tube MOS, anode is connected with bandwidth-limited circuit
Polar capacitor C5, the capacitance C6 that one end is connected with the drain electrode of field-effect tube MOS, the other end is grounded, is serially connected in field-effect tube MOS
Drain electrode and the anode of polar capacitor C7 between resistance R11 and one end be connected with the anode of polar capacitor C7, the other end
The resistance R12 of ground connection.
Further, the bandwidth-limited circuit includes the second order high-pass filtering circuit being connected with audio receiving module,
The second-order low-pass filter circuit being serially connected between second order 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 P2 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 audio amplifier circuit includes amplification chip U1, and anode is connected with 3 pins of amplification chip U1, cathode is grounded
Polar capacitor C9, the resistance R17 being in parallel with polar capacitor C9, one end is connected with 3 pins of amplification chip U1, the other end
The resistance R15 for connecing power supply, the capacitance C10 being serially connected between 2 pins of amplification chip U1 and 6 pins are in parallel with capacitance C10
Resistance R16；2 pins of institute amplification chip U1 are connected with the cathode of polar capacitor C8, its 7 pin connects power supply, 4 pins ground connection, 6
Pin is connect with loud speaker BT.
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 frequency filtering 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) 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 audio frequency broadcast system based on voltage follow 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 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 after capacitance C1 and capacitance C2 are filtered
High-pass filter is collectively formed in A1, the operational amplifier A 1, capacitance C1, capacitance C2, resistance R4 and resistance R3；The operation amplifier
Device A1 is negative-feedback, can be with the gain of stabilizing circuit.
The centre frequency of the second order high-pass filtering circuit isIn the present embodiment, capacitance C1
Capacitance with capacitance C2 is that the resistance value of 0.068 μ F, resistance R1 and resistance R2 are 8.2K Ω；It can be obtained by above-mentioned formula, this
The centre frequency f of second order high-pass filtering circuit in embodiment1=286Hz.In addition, the model 14001 of diode D1, resistance R4
Resistance value be 27K Ω, the resistance value of resistance R3 is 47K Ω, the model OP07 of operational amplifier A 1.What operational amplifier A 1 exported
Audio signal 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 P2 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 D3, diode D4, 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 D4 and polar capacitor
The anode of C7 is connected, the poles P are connected with the grid of field-effect tube MOS.Diode D3 is in parallel with diode D4.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 D4.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 D3, resistance R14 are 4.7K Ω, and the capacitance of polar capacitor C8 is 10 μ F.
In addition, the audio amplifier circuit includes amplification chip U1, anode is connected with 3 pins of amplification chip U1, bears
Polar capacitor C9, the resistance R17 being in parallel with polar capacitor C9 of pole ground connection, one end is connected with 3 pins of amplification chip U1,
The resistance R10, the capacitance C10 being serially connected between 2 pins of amplification chip U1 and 6 pins, with capacitance of another termination 12V voltages
The resistance R16 that C10 is in parallel.2 pins of the amplification chip U1 are connected with the cathode of polar capacitor C8, its 7 pin meets 12V
Voltage, 4 pins ground connection, 6 pins are connect with loud speaker BT.
Audio signal is input in amplification chip U1, by drive the speaker BT after amplification chip U1 amplifications.The polar capacitor
C9 and resistance R17 form a filter, can be filtered to input voltage, keep amplification chip U1 work more steady
It is fixed；Resistance R15 plays partial pressure, and the resistance value of resistance R15 and resistance R17 are 10K Ω, and the capacitance of polar capacitor C9 is
The resistance value of 0.1 μ F, resistance R16 are 1K Ω, and the capacitance of capacitance C10 is 4.7 μ F, the model LM74 of amplification chip U1.
As described above, the utility model can be realized well.
Claims (8)
1. the audio frequency broadcast system based on voltage follow, it is characterised in that：Including audio receiving module, with audio receiving module phase
The bandwidth-limited circuit of connection, the signal being connected with bandwidth-limited circuit follow circuit, follow circuit to be connected with signal
Audio amplifier circuit, and the loud speaker BT that is connected with audio amplifier circuit；It includes field-effect tube that the signal, which follows circuit,
MOS, anode be connected with the source electrode of field-effect tube MOS, the polar capacitor C8 that cathode is connected with audio amplifier circuit, one end and
The resistance R14 that the anode of polar capacitor C8 is connected, the other end is grounded, cathode are connected with the anode of polar capacitor C8, are positive
The polar capacitor pole C7, N being connected with the grid of field-effect tube MOS after resistance R13 is connected with the anode of polar capacitor C7,
The diode D4 that the poles P are connected with the grid of field-effect tube MOS, the diode D3 being in parallel with diode D4, cathode are imitated with field
Should pipe MOS grid be connected, the polar capacitor C5 that is connected with bandwidth-limited circuit of anode, one end and field-effect tube MOS's
The capacitance C6 that drain electrode is connected, the other end is grounded, is serially connected between the drain electrode of field-effect tube MOS and the anode of polar capacitor C7
The resistance R12 that resistance R11 and one end are connected with the anode of polar capacitor C7, the other end is grounded.
2. the audio frequency broadcast system according to claim 1 based on voltage follow, it is characterised in that：The bandpass filtering electricity
Road 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 polar capacitor
Second-order low-pass filter circuit between the anode of C5.
3. the audio frequency broadcast system according to claim 2 based on voltage follow, it is characterised in that：The second order high pass filter
Wave circuit includes operational amplifier A 1, one end is connected with audio receiving module, the other end after capacitance C2 with operational amplifier
The capacitance pole C1, P that the anode of A1 is connected is grounded after resistance R3, the poles N are connected with the tie point of capacitance C1 and capacitance C2
Diode D1, 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 amplifier
Resistance R4 and one end between the output end of device A1 and the poles P of diode D1 are connected, separately with the anode of operational amplifier A 1
The resistance R1 of one end ground connection；The output end of the operational amplifier A 1 is connected with second-order low-pass filter circuit, cathode and two
The poles P of pole pipe D1 are connected.
4. the audio frequency broadcast system according to claim 3 based on voltage follow, it is characterised in that：The step low-pass filter
Wave circuit includes operational amplifier A 2, one end is connected with the output end of operational amplifier A 1, the other end after resistance R7 with fortune
Calculate the resistance R5 that the anode of amplifier A2 is connected, one end is connected with the tie point of resistance R5 and resistance R7, the other end and fortune
Calculate the capacitance C4 that the output end of amplifier A2 is connected, the resistance R8 being in parallel with capacitance C4, one end and operational amplifier A 2
The capacitance C3 that anode is connected, the other end is grounded, the resistance R6 being in parallel with capacitance C3 and one end and operational amplifier A 2
The resistance R9 that output end is connected, the other end is grounded after resistance R10；The cathode of the operational amplifier P2 and resistance R9 and electricity
The tie point of resistance R10 is connected, its output end is then connected with the anode of polar capacitor C5.
5. the audio frequency broadcast system according to claim 4 based on voltage follow, it is characterised in that：The audio amplification electricity
Road includes amplification chip U1, the polar capacitor C9 that anode is connected with 3 pins of amplification chip U1, cathode is grounded, with polarity electricity
Hold the resistance R17 that are in parallel of C9, one end is connected with 3 pins of amplification chip U1, the resistance R15 of another termination power, concatenates
Capacitance C10 between 2 pins and 6 pins of amplification chip U1, the resistance R16 being in parallel with capacitance C10；Institute amplification chip U1
2 pins be connected with the cathode of polar capacitor C8, its 7 pin connects power supply, 4 pins ground connection, 6 pins connect with loud speaker BT.
6. the audio frequency broadcast system according to claim 5 based on voltage follow, it is characterised in that：The second order high pass filter
The centre frequency of wave circuit isThe centre frequency of the second-order low-pass filter circuit is
7. the audio frequency broadcast system according to claim 6 based on voltage follow, it is characterised in that：The second order high pass filter
The gain A of wave circuitF1Equal to the gain A of second-order low-pass filter circuitF2, i.e.,：The band logical filter
The gain A of wave circuitF=AF1AF2。
8. the audio frequency broadcast system according to claim 7 based on voltage follow, it is characterised in that：The bandpass filtering electricity
The frequency filtering on road is 300~3000Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820014273.5U CN207895428U (en) | 2018-01-04 | 2018-01-04 | Audio frequency broadcast system based on voltage follow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820014273.5U CN207895428U (en) | 2018-01-04 | 2018-01-04 | Audio frequency broadcast system based on voltage follow |
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| Publication Number | Publication Date |
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| CN207895428U true CN207895428U (en) | 2018-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820014273.5U Expired - Fee Related CN207895428U (en) | 2018-01-04 | 2018-01-04 | Audio frequency broadcast system based on voltage follow |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108021352A (en) * | 2018-01-04 | 2018-05-11 | 成都威邦科技有限公司 | Audio frequency broadcast system based on voltage follow |
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2018
- 2018-01-04 CN CN201820014273.5U patent/CN207895428U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108021352A (en) * | 2018-01-04 | 2018-05-11 | 成都威邦科技有限公司 | Audio frequency broadcast system based on voltage follow |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180921 Termination date: 20190104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |