CN102340563A - Method for eliminating TDD (time division duplex) noise of FM (frequency modulation)-GSM (global system for mobile communications) mobile phone - Google Patents
Method for eliminating TDD (time division duplex) noise of FM (frequency modulation)-GSM (global system for mobile communications) mobile phone Download PDFInfo
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- CN102340563A CN102340563A CN2010102379654A CN201010237965A CN102340563A CN 102340563 A CN102340563 A CN 102340563A CN 2010102379654 A CN2010102379654 A CN 2010102379654A CN 201010237965 A CN201010237965 A CN 201010237965A CN 102340563 A CN102340563 A CN 102340563A
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Abstract
The invention discloses a method for eliminating TDD (time division duplex) noise of an FM (frequency modulation)-GSM (global system for mobile communications) mobile phone. The GSM mobile phone comprises a baseband processor, an audio power amplifier and an analogue switch; an FM channel and a grounding end are used as a pair of pseudo differential signals which are input into an input end of the analogue switch; an output end of the analogue switch is connected in parallel with a differential audio signal end and input into the audio power amplifier; when an audio file is played, the baseband processor increases the level of an enable end of the audio power amplifier, the audio power amplifier starts working, and meanwhile, the level of an FM enable end is reduced, and the FM channel of the analogue switch is cut off; when an FM program is broadcast, the differential audio signal end is closed, and the channel selection level of the analogue switch is increased to open the FM channel at the same time. In the invention, the FM input end possibly bringing interference is cut off through the analogue switch, and thus the TDD noise in a communication process is successfully eliminated.
Description
Technical field
The present invention relates to a kind of mobile communication technology; Particularly relate to a kind of removal FM (FrequencyModulation; Frequency modulation) GSM (Global System for Mobile Communications; Global system for mobile communications) method of mobile phone time division duplex noise (TDD noise, Time Division Distortionnoise).
Background technology
Because what the raising of cell-phone function integrated level and FM used on mobile phone reaches its maturity, increasing people utilizes mobile phone to listen to the FM program, and plays back through mobile phone Speaker (loud speaker).At present a lot of schemes all are with the audio signal of audio decoder output and FM output audio signal and are input to the D class power amplifier of fully differential together, play back with the music signal amplification and through Speaker through D class power amplifier.Because the PA (power amplifier) of GSM mobile handset radiofrequency emitting module end had the generation that transmits in per 1/216.8 second; In this signal, comprise the 2.0G GSM signal of 900MHz/1800MHz or 1900MHz and the envelope (envelope) of PA, FM causes drone noise (being time-division duplex noise) with the interference that single-ended format input D class power amplifier is easy to receive this signal.
Traditional scheme is with the audio signal and the FM output audio signal of audio decoder output and is input to fully differential D class audio frequency power amplifier together; Music signal is amplified and passes through OUTA (output terminals A) and OUTB (output B) output through fully differential D class audio frequency power amplifier; Play back through Speaker at last; As shown in Figure 1; Its control mode is: close FM during audio files such as broadcast MP3, MP4, audio frequency is transferred to fully differential D genus audio power amplifier (" power amplifier " can abbreviate " power amplifier " as) through two differential signal end AUXSPKP, AUXSPKN; Close two differential signal end AUXSPKP, AUXSPKN when playing FM; The FM audio signal is amplified the back through OUTA (output terminals A) and OUTB (output B) output through the single-ended fully differential D genus audio power amplifier that inputs to of FM_LOUT (L channel output), plays back through Speaker at last.Because the TDD that the FM input receives disturbs the TDD that is greater than earth terminal to disturb (antijamming capability of earth terminal is stronger); Thereby the difference that FM input and earth terminal disturb is amplified through D class power amplifier and is caused the time division duplex generating noise, the terminal show as hand-free call or incoming call the time Speaker have buzz.
Summary of the invention
The technical problem that the present invention will solve is in order to overcome the defective of prior art, a kind of method of the FM-GSM of removal mobile phone time division duplex noise to be provided, and it has been eliminated because the noise that TDD causes.
The present invention solves above-mentioned technical problem through following technical proposals: a kind of method of the FM-GSM of removal mobile phone time division duplex noise; It is characterized in that; This GSM mobile handset comprises BBP, audio-frequency power amplifier and analog switch; FM path and earth terminal input to the analog switch input as a pair of pseudo-differential signal, and analoging switch output end is connected in parallel to difference audio signal end and is input to audio-frequency power amplifier; During displaying audio file, BBP is drawn high audio-frequency power amplifier Enable Pin level, and audio-frequency power amplifier is started working, and simultaneously FM Enable Pin level is dragged down, with the FM path cut-out of analog switch; Close difference audio signal end when playing the FM program, analog switch channel selecting level is drawn high opened the FM path simultaneously.
Preferably, said audio-frequency power amplifier is a fully differential D genus audio power amplifier, and the difference audio signal output of BBP output is to fully differential D genus audio power amplifier.
Preferably, the difference audio signal of said BBP output or FM audio signal are amplified the back through reversed-phase output and in-phase output end output through fully differential D genus audio power amplifier, come out through player plays at last.
Preferably, said audio file is the file of MP3 or MP4 form.
Positive progressive effect of the present invention is: the present invention has cut off through analog switch can introduce the FM input that disturbs, thereby has successfully eliminated the time division duplex noise in the communication process.
Description of drawings
Fig. 1 is the schematic diagram of prior art voice playing.
Fig. 2 is the schematic diagram of voice playing of the present invention.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to specify technical scheme of the present invention.
As shown in Figure 2; The present invention provides a kind of method of the FM-GSM of removal mobile phone time division duplex noise; It is doing following improvement on circuit and on the software control mode: on the basis of fully differential D genus audio power amplifier and BBP, increased an analog switch; FM path and earth terminal (GND) input to the analog switch input as a pair of pseudo-differential signal, and analoging switch output end is connected in parallel to two difference audio signal end AUXSPKP, AUXSPKN and is input to fully differential D class audio frequency power amplifier.During audio files such as broadcast MP3, MP4 form; BBP is drawn high AMP_EN (audio-frequency power amplifier Enable Pin) level; Fully differential D class audio frequency power amplifier is started working, and simultaneously FM_EN (analog switch channel selecting level) level is dragged down, with the FM path cut-out of analog switch; Close two difference audio signal end AUXSPKP, AUXSPKN when playing the FM program; Simultaneously the FM_EN level is drawn high and opened the FM path; Difference audio signal or FM signal amplify the back through OUTA (output terminals A or reversed-phase output) and OUTB (output B or in-phase output end) output through fully differential D genus audio power amplifier, play back through Speaker at last.The time division duplex noise is relatively more serious under PA high power work situation; Promptly in mobile phone incoming call, exhalation and communication process; In this process, cut off meeting and introduced the FM input that disturbs, thereby successfully eliminated the time division duplex noise in the communication process through analog switch.
Wherein BBP is the SC6600H type BBP of spreadtrum company, and fully differential D genus audio power amplifier is the TS4997 type power amplifier of STMicw Electronics.The difference audio signal output of BBP output is to fully differential D genus audio power amplifier.
Though more than described embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these execution modes.Therefore, protection scope of the present invention is limited appended claims.
Claims (4)
1. method of removing FM-GSM mobile phone time division duplex noise; It is characterized in that; This GSM mobile handset comprises BBP, audio-frequency power amplifier and analog switch; FM path and earth terminal input to the analog switch input as a pair of pseudo-differential signal, and analoging switch output end is connected in parallel to difference audio signal end and is input to audio-frequency power amplifier; During displaying audio file, BBP is drawn high audio-frequency power amplifier Enable Pin level, and audio-frequency power amplifier is started working, and simultaneously FM Enable Pin level is dragged down, with the FM path cut-out of analog switch; Close difference audio signal end when playing the FM program, analog switch channel selecting level is drawn high opened the FM path simultaneously.
2. the method for removal FM-GSM mobile phone time division duplex noise as claimed in claim 1; It is characterized in that; Said audio-frequency power amplifier is a fully differential D genus audio power amplifier, and the difference audio signal output of BBP output is to fully differential D genus audio power amplifier.
3. the method for removal FM-GSM mobile phone time division duplex noise as claimed in claim 2; It is characterized in that; The difference audio signal of said BBP output or FM audio signal are amplified the back through reversed-phase output and in-phase output end output through fully differential D genus audio power amplifier, come out through player plays at last.
4. the method for removal FM-GSM mobile phone time division duplex noise as claimed in claim 1 is characterized in that said audio file is the file of MP3 or MP4 form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102379654A CN102340563A (en) | 2010-07-27 | 2010-07-27 | Method for eliminating TDD (time division duplex) noise of FM (frequency modulation)-GSM (global system for mobile communications) mobile phone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102379654A CN102340563A (en) | 2010-07-27 | 2010-07-27 | Method for eliminating TDD (time division duplex) noise of FM (frequency modulation)-GSM (global system for mobile communications) mobile phone |
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| CN102340563A true CN102340563A (en) | 2012-02-01 |
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| CN2010102379654A Pending CN102340563A (en) | 2010-07-27 | 2010-07-27 | Method for eliminating TDD (time division duplex) noise of FM (frequency modulation)-GSM (global system for mobile communications) mobile phone |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104768101A (en) * | 2014-12-29 | 2015-07-08 | 青岛歌尔声学科技有限公司 | Audio multiplexing circuit, audio multiplexing system and audio multiplexing method |
| WO2016095683A1 (en) * | 2014-12-15 | 2016-06-23 | 华为技术有限公司 | Method and device for eliminating tdd noise |
| CN105827772A (en) * | 2015-05-21 | 2016-08-03 | 维沃移动通信有限公司 | Method and device of inhibiting noise interference and mobile terminal |
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| US4087641A (en) * | 1976-04-01 | 1978-05-02 | Pioneer Electronic Corporation | Noise limiting circuit for FM stereo receiver |
| CN101232744A (en) * | 2008-01-24 | 2008-07-30 | 中兴通讯股份有限公司 | Method and device for multi sound source sharing audio power amplifier |
| CN201444650U (en) * | 2008-12-30 | 2010-04-28 | 上海闻泰电子科技有限公司 | Mobile terminal for realizing 3D sound effect function |
| CN101710911A (en) * | 2009-11-19 | 2010-05-19 | 中兴通讯股份有限公司 | Device for realizing audio switchover by using analog switch |
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2010
- 2010-07-27 CN CN2010102379654A patent/CN102340563A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| US4087641A (en) * | 1976-04-01 | 1978-05-02 | Pioneer Electronic Corporation | Noise limiting circuit for FM stereo receiver |
| CN101232744A (en) * | 2008-01-24 | 2008-07-30 | 中兴通讯股份有限公司 | Method and device for multi sound source sharing audio power amplifier |
| CN201444650U (en) * | 2008-12-30 | 2010-04-28 | 上海闻泰电子科技有限公司 | Mobile terminal for realizing 3D sound effect function |
| CN101710911A (en) * | 2009-11-19 | 2010-05-19 | 中兴通讯股份有限公司 | Device for realizing audio switchover by using analog switch |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016095683A1 (en) * | 2014-12-15 | 2016-06-23 | 华为技术有限公司 | Method and device for eliminating tdd noise |
| CN104768101A (en) * | 2014-12-29 | 2015-07-08 | 青岛歌尔声学科技有限公司 | Audio multiplexing circuit, audio multiplexing system and audio multiplexing method |
| CN104768101B (en) * | 2014-12-29 | 2018-08-24 | 青岛歌尔声学科技有限公司 | Audio-frequency multiplex circuit and system |
| CN105827772A (en) * | 2015-05-21 | 2016-08-03 | 维沃移动通信有限公司 | Method and device of inhibiting noise interference and mobile terminal |
| CN105827772B (en) * | 2015-05-21 | 2019-03-05 | 维沃移动通信有限公司 | A kind of method, apparatus inhibiting noise jamming and a kind of mobile terminal |
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Application publication date: 20120201 |