CN1761162A - Differential circuit of wireless communication device and operation method - Google Patents
Differential circuit of wireless communication device and operation method Download PDFInfo
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- CN1761162A CN1761162A CN 200410051783 CN200410051783A CN1761162A CN 1761162 A CN1761162 A CN 1761162A CN 200410051783 CN200410051783 CN 200410051783 CN 200410051783 A CN200410051783 A CN 200410051783A CN 1761162 A CN1761162 A CN 1761162A
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- voice signal
- circuit
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- communication device
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Abstract
The differential circuit includes signal attenuation circuit and phase shifting circuit. The differential circuit is coupled between analogy voice signal and output device. Under mode of differential inputs, the differential circuit outputs a set of analogy voice signal with 180 degree of phase difference in order to reach target of lowering noise interference.
Description
[technical field]
The invention relates to a kind of circuit that can improve opposing noise ability, and particularly relevant for a kind of differential circuit and method of operation thereof that can improve radio communication device opposing noise ability.
[background technology]
Present mass society masses' communication mode slowly epoch that entered radio communication, so the utilization rate of radio communication device on various occasions is also more and more high, more be tending towards variation, as mobile phone, Smart Phone (mobile phone+PDA) or the like, various small-sized personal communicator are being developed gradually also, and become people in daily life the liaison instrument that must have, and also just because of under so frequent use situation, the communication quality of radio communication device also more and more has been subjected to all users' attention.
In general, the mode of radio communication device reception and processing signals, usually all be to see through earlier after the antenna receiving signal, again that antenna is received signal is sent among the circuit, begin then signal is carried out a series of processing, be sent to coding and decoding circuit at last, the work of signal being deciphered via coding and decoding circuit, after action through decoding, signal will be reduced into original analog voice signal that we are wanted, and this analog voice signal connects with direct-connected mode and output device (as earphone or loudspeaker) again, and signal is sent out smoothly.
If but as above-mentioned said, analog voice signal and output device that coding and decoding circuit is deciphered out transmit in direct-connected mode, usually in the middle of this connection transmits the process of analog voice signal, originally analog voice signal is easy to will be because of the interference that is subjected to additive noise, and makes analog voice signal produce the phenomenon of distortion and decay.
[summary of the invention]
The object of the present invention is to provide a kind of differential circuit of radio communication device, this differential circuit is coupled among the radio communication device, so can not only increase the ability of analog voice signal opposing noise, and also can not take under the too big area of circuit substrate at this circuit, this differential circuit can be used more flexibly.
For reaching above-mentioned purpose of the present invention, the present invention proposes a kind of differential circuit of radio communication device, and this circuit is coupled between the first input end and second input of analog voice signal and output unit.This differential circuit comprises: signal attenuation circuit and phase-shift circuit.Wherein, this attenuator circuit comprises resistor, and this resistor receives analog voice signal, this analog voice signal of decaying then, and the signal after will decaying is sent to the first input end of output unit; Phase-shift circuit is one group of high pass circuit, this high pass circuit comprises resistor and capacitor, this phase-shift circuit is coupled to signal attenuation circuit, analog voice signal after reception is decayed by signal attenuation circuit, make phase-shift processing then, and this analog voice signal is sent to second input of output unit, because the first input end of output device and second input are differential input, signal just in time differs 180 degree, so the noise jamming that this analog voice signal is added originally will be eliminated.
For reaching above-mentioned purpose of the present invention, the present invention proposes a kind of method of operation of differential circuit of radio communication device, its step of carrying out is for after antenna receives into one group of signal, after inner other processing of circuit through radio communication device, export one group of analog voice signal by coding and decoding circuit at last, this analog voice signal will be transferred into the signal attenuation circuit in the differential circuit, the amplitude of this analog voice signal of decaying then is 1/2nd of signal originally, is sent to the first input end of output unit; Phase-shift circuit couples signal attenuation circuit, and the analog voice signal after this decay of reception and phase shift behind anti-phase 180 degree of this analog voice signal, is sent to second input of output unit.Because the first input end of output device and second input are differential input, signal just in time differs 180 degree, so the noise jamming that this analog voice signal is added originally will be eliminated; Therefore, if analog voice signal can improve the ability of its opposing noise through after the processing of this differential circuit.
In sum,, between analog voice signal and output unit, couple a differential circuit, can increase the ability of analog voice signal opposing noise according to differential circuit proposed by the invention.In addition, because the assembly that this differential circuit constituted and few so do not taking under the too big area of circuit substrate, can make this differential circuit be used more flexibly.
[description of drawings]
Fig. 1 is the calcspar of the radio communication device of preferred embodiment proposed by the invention.
Fig. 2 is the differential circuit of preferred embodiment proposed by the invention.
Fig. 3 is the flow chart of the differential circuit of a kind of radio communication device proposed by the invention.
[embodiment]
Please refer to shown in Figure 1ly, it is the radio communication device calcspar according to preferred embodiment proposed by the invention.
After wireless communication system is come in by one group of signal of antenna 10 receptions, after through other processing of circuit in the radio communication device, at last can be by one group of analog voice signal of coding and decoding circuit 20 outputs, with in this analog voice signal input differential circuit, differential circuit mainly comprises signal attenuation circuit 30 and phase-shift circuit 40 again; With reference to shown in Figure 2, signal attenuation circuit comprises first resistance R 1, and phase-shift circuit is a high pass circuit, and this high pass circuit comprises second resistance R 2 and capacitor C 1; After attenuator circuit receives by the analog voice signal that coding and decoding circuit sent, can decay via R1, and output amplitude is the first input end 60 of the deamplification of original signal 1/2nd to output device 50; Phase-shift circuit couples attenuator circuit, receiving attenuation analog voice signal later, and make phase-shift processing, behind signal inversion 180 degree, be sent to second input 70 of output device, because the first input end of output device and second input are differential input, the analog voice signal of its input just in time differs 180 degree, so the noise jamming that this analog voice signal is added originally will be eliminated; Therefore, if analog voice signal can improve the ability of its opposing noise through after the processing of this differential circuit.
Please refer to shown in Figure 3ly, it is the flow chart according to the differential circuit of a kind of radio communication device proposed by the invention.
In step S32, behind the analog voice signal that differential circuit reception is deciphered out by coding and decoding circuit, in step S34, transmit signals in the signal attenuation circuit and decay, output amplitude is half a analog voice signal of original signal, in step 36, decay analog voice signal later is sent to the first input end and the phase-shift circuit of output device, in step S38, signal after phase-shift circuit will be decayed is made phase-shift processing, behind signal inversion 180 degree, export second input of output device again to; Through the calculation process of this differential circuit, the noise signal that this analog voice signal is added originally will be eliminated, and therefore, if an analog signal can improve the ability of its opposing noise through after the processing of this differential circuit.
Claims (9)
1. the differential circuit of a radio communication device in order to receiving an analog voice signal, and is coupled to a first input end and one second input of an output unit of this radio communication device, it is characterized in that this differential circuit comprises:
One signal attenuation circuit is in order to receive and this analog voice signal of decaying, to export one first differential voice signal this first input end to this output unit of this radio communication device; And
One phase-shift circuit is coupled to this signal attenuation circuit, in order to this first differential voice signal of phase shift, and exports one second differential voice signal this second input to this output unit of this radio communication device.
2. the differential circuit of radio communication device according to claim 1, it is characterized in that: this signal attenuation circuit comprises one first resistance.
3. the differential circuit of radio communication device according to claim 1, it is characterized in that: this phase-shift circuit is a high pass circuit.
4. the differential circuit of radio communication device according to claim 3, it is characterized in that: this high pass circuit comprises one second resistance and an electric capacity.
5. the method for operation of the differential circuit of a radio communication device, this differential circuit receives an analog voice signal, and is coupled to a first input end and one second input of an output unit of this radio communication device, and method of operation comprises:
Receive an analog voice signal;
This analog voice signal of decaying is to obtain and to export one first differential voice signal this first input end to this output unit; And
This first differential voice signal is made a phase shift calculation process, to obtain and to export one second differential voice signal this second input to this output unit.
6. the method for operation of the differential circuit of radio communication device according to claim 5 is characterized in that: this first differential voice signal and this analog voice signal homophase.
7. the method for operation of the differential circuit of radio communication device according to claim 6 is characterized in that: the amplitude fading that this decay computing makes this first differential voice signal is 1/2nd of the amplitude of this analog voice signal.
8. the method for operation of the differential circuit of radio communication device according to claim 5 is characterized in that: this phase shift computing makes anti-phase 180 degree of this first differential voice signal.
9. the method for operation of the differential circuit of radio communication device according to claim 8 is characterized in that: the amplitude size of this second differential voice signal is identical with the amplitude size of this first differential voice signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051783 CN1761162A (en) | 2004-10-11 | 2004-10-11 | Differential circuit of wireless communication device and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051783 CN1761162A (en) | 2004-10-11 | 2004-10-11 | Differential circuit of wireless communication device and operation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1761162A true CN1761162A (en) | 2006-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 200410051783 Pending CN1761162A (en) | 2004-10-11 | 2004-10-11 | Differential circuit of wireless communication device and operation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108260040A (en) * | 2016-12-29 | 2018-07-06 | 瑞昱半导体股份有限公司 | For individual earphones headphone amplifier circuit and its operating method and use its Headphone device with USB interface |
-
2004
- 2004-10-11 CN CN 200410051783 patent/CN1761162A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108260040A (en) * | 2016-12-29 | 2018-07-06 | 瑞昱半导体股份有限公司 | For individual earphones headphone amplifier circuit and its operating method and use its Headphone device with USB interface |
| CN108260040B (en) * | 2016-12-29 | 2020-07-14 | 瑞昱半导体股份有限公司 | Headphone amplifier circuit, method of operating the same, and headphone apparatus |
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