CN201286130Y - Audio uni-channel duplex communication circuit - Google Patents
Audio uni-channel duplex communication circuit Download PDFInfo
- Publication number
- CN201286130Y CN201286130Y CNU2008201419756U CN200820141975U CN201286130Y CN 201286130 Y CN201286130 Y CN 201286130Y CN U2008201419756 U CNU2008201419756 U CN U2008201419756U CN 200820141975 U CN200820141975 U CN 200820141975U CN 201286130 Y CN201286130 Y CN 201286130Y
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- operational amplifier
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Abstract
The utility model relates to an audio frequency single-channel full-duplex communication circuit, characterized by comprising an audio-frequency signal amplifying processing module, a phase balance adjusting module and an audio-frequency signal processing module, wherein the phase balance adjusting module is respectively connected with the audio-frequency signal amplifying processing module and the audio-frequency signal processing module. The utility model has the advantages that: compared with the prior art, the new circuit comprises a operational module, thus the structure is simple and easy; the feed signal is restrained by a phase cancellation method, thereby the transmit-receive rejection ratio is greatly increased, the restrain of the prior circuit to the feed signal reach -20dBm to -25dBm, while the restrain of the new circuit to the feed signal reach -35dBm to -40dBm.
Description
Technical field
The utility model relates to a kind of telecommunication circuit, particularly a kind of audio frequency single channel full-duplex communication circuit of high transmitting-receiving rejection ratio.
Background technology
Existing two or the four line change-over circuits of being made up of resistor network can be realized the single channel full-duplex communication, but the circuit more complicated, whole transmitting-receiving rejection ratio is not high, so signal is disturbed easily in communication process.
Summary of the invention
Deficiency in view of the prior art existence, the utility model provides a kind of lattice network of mainly being made up of amplifier, when sending audio signal, signal is through the audio frequency magnification processing, make signal in single channel, satisfy communication standard (output 0dBm, impedance 600 Ω), this moment feedback circuit, utilize the phase cancellation method with feedback signal be suppressed to minimum (can reach-35dBm～-40dBm), circuit is at the same time during receiving and transmitting signal like this, the feedback signal that transmits is repressed very little, and is very little to the effect of signals that receives, thereby realizes the improved audio frequency single channel full-duplex communication circuit to original technology.
The technical scheme that the utility model is taked for achieving the above object is: audio frequency single channel full-duplex communication circuit, it is characterized in that: comprise audio signal processing and amplifying module, phase equilibrium adjustment module and audio-frequency signal processing module, described phase equilibrium adjustment module is connected with audio signal processing and amplifying module and audio-frequency signal processing module respectively.
The beneficial effects of the utility model are: compared with prior art, new circuit is made up of the amplifier module, easy understanding simple in structure, utilize the phase cancellation method to suppress feedback signal, improve the transmitting-receiving rejection ratio greatly, available circuit to the inhibition of feedback signal reach-20dBm～-20dBm25dBm about, and this new circuit to the inhibition of feedback signal reach-35dBm～-35dBm40dBm about.
Description of drawings
Fig. 1 is that circuit of the present utility model connects block diagram and as Figure of abstract.
Fig. 2 is a phase equilibrium adjustment module circuit diagram of the present utility model.
Embodiment
A kind of as shown in Figure 1, 2 audio frequency single channel full-duplex communication circuit, comprise audio signal processing and amplifying module, phase equilibrium adjustment module and audio-frequency signal processing module, described phase equilibrium adjustment module is connected with audio signal processing and amplifying module and audio-frequency signal processing module respectively.
The phase equilibrium adjustment module comprises: resistance R 1～R11, capacitor C 1～C5, potentiometer RP1, RP2, operational amplifier N1a, N1b, resistance R 1 one ends are connected with capacitor C 5 positive poles and resistance R 2 one ends respectively, capacitor C 5 negative poles are connected with audio signal processing and amplifying module, audio signal processing and amplifying mould received audio signal, resistance R 1 other end connects an end of remote-control at audiofrequency line channel and resistance R 4 respectively, the other end of resistance R 4 is connected with the negative input of operational amplifier N1a, resistance R 2 other ends are by potentiometer RP1 and capacitor C 1 ground connection, resistance R 3 one ends respectively with resistance R 2, capacitor C 2 positive poles and resistance R 7 one ends connect, resistance R 3 another termination operational amplifier N1a electrode input ends, operational amplifier N1a power input meets power supply VCC, negative input and output parallel resistance R6, the N1a output connects operational amplifier N1b negative input by capacitor C 4 and resistance R 10, operational amplifier earth terminal ground connection, resistance R 7 other ends are connected with power supply VCC/2 and resistance R 8 one ends respectively, capacitor C 2 negative poles are connected with potentiometer RP2 one end and capacitor C 3 negative poles respectively by resistance R 5, potentiometer RP2 other end ground connection, capacitor C 3 positive poles are connected with resistance R 8 other ends and resistance R 9 one ends respectively, resistance R 9 another termination operational amplifier N1b electrode input ends, operational amplifier N1b negative input and output parallel resistance R11, output is connected with audio-frequency signal processing module, the audio-frequency signal processing module output audio signal.
At first regulate " audio signal processing and amplifying module ", make it audio signal arranged when audio signal is imported, the audio signal by " remote-control at audiofrequency line channel " output is 0dBm (input impedance 600 Ω); This moment, feedback signal also was added to " phase equilibrium adjustment module ", regulate RP1, RP2 potentiometer repeatedly, find balance point, can make feedback signal by the audio-frequency signal processing module output audio signal reach-35dBm～-35dBm40dBm about, regulate this moment and finish, circuit can be realized the audio frequency single channel full-duplex communication of high transmitting-receiving rejection ratio.
Claims (2)
1, a kind of audio frequency single channel full-duplex communication circuit, it is characterized in that: comprise audio signal processing and amplifying module, phase equilibrium adjustment module and audio-frequency signal processing module, described phase equilibrium adjustment module is connected with audio signal processing and amplifying module and audio-frequency signal processing module respectively.
2, audio frequency single channel full-duplex communication circuit according to claim 1, it is characterized in that: described phase equilibrium adjustment module comprises: resistance R 1～R11, capacitor C 1～C5, potentiometer RP1, RP2, operational amplifier N1a, N1b, described resistance R 1 one ends respectively with capacitor C 5 positive poles, resistance R 2 one ends connect, resistance R 1 other end is connected with the negative input of operational amplifier N1a by resistance R 4, described resistance R 2 other ends are by potentiometer RP1 and capacitor C 1 ground connection, described resistance R 3 one ends respectively with resistance R 2, capacitor C 2 positive poles and resistance R 7 one ends connect, resistance R 3 another termination operational amplifier N1a electrode input ends, operational amplifier N1a power input meets power supply VCC, negative input and output parallel resistance R6, the N1a output connects operational amplifier N1b negative input by capacitor C 4 and resistance R 10, operational amplifier N1a earth terminal ground connection, resistance R 7 other ends are connected with power supply VCC/2 and resistance R 8 one ends respectively, capacitor C 2 negative poles are connected with potentiometer RP2 one end and capacitor C 3 negative poles respectively by resistance R 5, potentiometer RP2 other end ground connection, capacitor C 3 positive poles are connected with resistance R 8 other ends and resistance R 9 one ends respectively, resistance R 9 another termination operational amplifier N1b electrode input ends, operational amplifier N1b negative input and output parallel resistance R11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201419756U CN201286130Y (en) | 2008-09-19 | 2008-09-19 | Audio uni-channel duplex communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201419756U CN201286130Y (en) | 2008-09-19 | 2008-09-19 | Audio uni-channel duplex communication circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201286130Y true CN201286130Y (en) | 2009-08-05 |
Family
ID=40951096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201419756U Expired - Lifetime CN201286130Y (en) | 2008-09-19 | 2008-09-19 | Audio uni-channel duplex communication circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201286130Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586744A (en) * | 2018-11-23 | 2019-04-05 | 天津七六四通信导航技术有限公司 | A kind of waterproof energy-saving type VOCA voice communications assembly |
-
2008
- 2008-09-19 CN CNU2008201419756U patent/CN201286130Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586744A (en) * | 2018-11-23 | 2019-04-05 | 天津七六四通信导航技术有限公司 | A kind of waterproof energy-saving type VOCA voice communications assembly |
| CN109586744B (en) * | 2018-11-23 | 2020-08-18 | 天津七六四通信导航技术有限公司 | Waterproof energy-saving audio communication device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090805 |
|
| CX01 | Expiry of patent term |