CN1929511B - Mobile phone baseband chip audio frequency switching device - Google Patents
Mobile phone baseband chip audio frequency switching device Download PDFInfo
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- CN1929511B CN1929511B CN2005100295390A CN200510029539A CN1929511B CN 1929511 B CN1929511 B CN 1929511B CN 2005100295390 A CN2005100295390 A CN 2005100295390A CN 200510029539 A CN200510029539 A CN 200510029539A CN 1929511 B CN1929511 B CN 1929511B
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Abstract
This invention discloses one cell phone chip audio frequency switch device, which comprises at least one DSP, connection circuit DAC, DSP to provide two paths of signals with one connected to cell phone output end and second end connected to the cell phone earphone. The DSP sends sound digital signals to one path of DAC with output analogue signals through operation difference to phone to realizecall sound function and the DSP sends the left and right digital signals to the said one and second paths.
Description
Technical field
The present invention relates to a kind of audio frequency switching device, relate in particular to a kind of mobile phone baseband chip audio frequency switching device.
Background technology
The common baseband chip audio frequency output of mobile phone at present is generally two-way difference voice signal.As shown in Figure 1, provide differential signal to loudspeaker on loudspeaker on the mobile phone and the earphone respectively; Chip internal digital signal processor (DSP is Digital Signal Processor) provides speech data to D/A (DAC is Digital-to-Analog Converter), the output differential analog signal.Fig. 2 because the data difference of left and right acoustic channels needs chip DSP to provide left and right sides speech data to two-way DAC respectively, exports the single-ended analog signal of two-way for stereophonic signals such as MP3 simultaneously.Therefore generally speaking, just respectively get one as output from two pairs of audio signals of peripheral circuit.In the time of when these two kinds of patterns will be on same product, need realizing, will use circuit shown in Figure 3, need add an analog switch and control.Doing like this to increase the peripheral components cost, takies the space of mobile phone board preciousness.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of mobile phone baseband chip audio frequency switching device, to optimize conventional implementation, saves the mobile phone board space.
For solving the problems of the technologies described above, the invention provides a kind of mobile phone baseband chip audio frequency switching device, comprising: at least one DSP, connect two-way DAC, DSP provides signal to two-way DAC; Wherein first via DAC is connected with earpiece output by switch, and the second road DAC is connected with handset earphone output by switch;
When realizing answering cell phone calling voice function, DSP gives first via DAC with voice digital signal, and the analog signal of DAC output outputs to receiver by amplifier while difference again;
Stereo when listening to function when what realize left and right acoustic channels, DSP gives the described first via, the second road DAC respectively with the digital signal of left and right acoustic channels, and single-ended analog signal of every road DAC output outputs to handset earphone;
When realizing earphone receiving calling voice function, DSP gives the described first via, the second road DAC simultaneously with voice digital signal, and every road DAC only exports a single-ended analog signal and outputs to handset earphone.
The present invention can reduce peripheral components owing to adopt said apparatus and implementation method, optimizes mobile phones design, reduces system cost.
Description of drawings
Fig. 1 is the circuit diagram of present mobile phone base band chip output differential signal to loudspeaker and earphone;
Fig. 2 is the circuit diagram that present mobile phone base band chip is exported single-ended analog signal;
Fig. 3 is the circuit diagram that present mobile phone realizes exporting differential signal or single-ended analog signal simultaneously;
Fig. 4 is the circuit diagram of a specific embodiment of handset audio switching device shifter of the present invention;
Fig. 5 is a schematic diagram of realizing earpiece incoming call answering voice among the present invention, can be used for Fig. 4;
Fig. 6 is the stereo schematic diagram of listening to of realizing left and right acoustic channels among the present invention, and can be used for Fig. 4;
Fig. 7 is the schematic diagram that the voice of realization earphone among the present invention are answered, and can be used for Fig. 4.
Embodiment
The present invention is further detailed explanation below in conjunction with drawings and the specific embodiments.
Be the circuit diagram of a specific embodiment of handset audio switching device shifter of the present invention as shown in Figure 4, comprise a DSP, connect two-way DAC, DSP provides signal to two-way DAC; Wherein first via DAC is connected with earpiece output by switch, and the second road DAC is connected with handset earphone output by switch.
As shown in the figure, when stereophonic signals such as corresponding MP3, the implementation method before the continuity.When carrying out voice call with earphone, peripheral circuit is constant.Inner DSP send same data for DAC-L and DAC-R, though like this from the different DAC outputs of two-way, but same analog signal of voice has realized phonetic function.
Below in conjunction with accompanying drawing, the concrete method that realizes the audio frequency handoff functionality of introducing:
Be the schematic diagram of realizing earpiece incoming call answering voice among the present invention as shown in Figure 5: in the time of the receiver incoming call answering voice on the use mobile phone, DSP on the mobile phone gives first via DAC with voice digital signal DATA, and the analog signal of DAC output outputs to receiver by amplifier while difference again.
Be the stereo schematic diagram of listening to of realizing left and right acoustic channels among the present invention as shown in Figure 6: when using earphone to listen to stereophonic signal such as MP3, DSP on the mobile phone gives two-way DAC respectively with the digital signal DATA of left and right acoustic channels, and single-ended analog signal of every road DAC output outputs to earphone realization the stereo of left and right acoustic channels and listens to.
Be the schematic diagram of realizing among the present invention that the voice of earphone are answered as shown in Figure 7: when using the earphone receiving calling voice, DSP on the mobile phone gives two-way DAC simultaneously with voice digital signal DATA, every road DAC only exports a single-ended analog signal and outputs to earphone, and promptly earphone left and right acoustic channels output same signal realizes that the voice of stereophone answer.
Claims (1)
1. mobile phone baseband chip audio frequency switching device, it is characterized in that, described device comprises: at least one digital signal processor, connect first via D/A and second way/weighted-voltage D/A converter, and described digital signal processor provides signal to the described first via, second way/weighted-voltage D/A converter; Described first via D/A is connected with first sound channel output of earpiece output and handset earphone respectively by switch, and described second way/weighted-voltage D/A converter is connected with second sound channel output of handset earphone by switch;
When realizing the calling voice function, the digital signal processor of described device is given first via D/A with voice digital signal, and the analog signal of this D/A output outputs to receiver by amplifier while difference again;
Stereo when listening to function when what realize left and right acoustic channels, the digital signal processor of described device is given the described first via, second way/weighted-voltage D/A converter respectively with the digital signal of left and right acoustic channels, and every way/single-ended analog signal of weighted-voltage D/A converter output outputs to handset earphone;
When realizing earphone receiving calling voice function, the digital signal processor of described device is given the described first via, second way/weighted-voltage D/A converter simultaneously with voice digital signal, and every way/weighted-voltage D/A converter is only exported a single-ended analog signal and outputed to handset earphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100295390A CN1929511B (en) | 2005-09-09 | 2005-09-09 | Mobile phone baseband chip audio frequency switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100295390A CN1929511B (en) | 2005-09-09 | 2005-09-09 | Mobile phone baseband chip audio frequency switching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1929511A CN1929511A (en) | 2007-03-14 |
| CN1929511B true CN1929511B (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2005100295390A Active CN1929511B (en) | 2005-09-09 | 2005-09-09 | Mobile phone baseband chip audio frequency switching device |
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| CN (1) | CN1929511B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811861B (en) * | 2012-12-17 | 2018-02-06 | 青岛海信宽带多媒体技术有限公司 | A kind of Hi Fi audio frequency adaptors |
| CN104254040B (en) * | 2013-06-28 | 2019-08-16 | 深圳富泰宏精密工业有限公司 | Mobile communication terminal Audio conversion system |
| CN103929182A (en) * | 2014-04-13 | 2014-07-16 | 郭昊 | Audio processing device, audio playing device and audio control method |
| CN111770415B (en) * | 2019-07-12 | 2021-12-03 | 北京京东尚科信息技术有限公司 | Method and device for switching loudspeaker and earphone |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1469618A (en) * | 2002-07-19 | 2004-01-21 | ������������ʽ���� | Cell phone terminal |
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- 2005-09-09 CN CN2005100295390A patent/CN1929511B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1469618A (en) * | 2002-07-19 | 2004-01-21 | ������������ʽ���� | Cell phone terminal |
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| CN1929511A (en) | 2007-03-14 |
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