CN203446012U - Audio signal processing circuit used for wireless communication terminal and wireless communication terminal - Google Patents
Audio signal processing circuit used for wireless communication terminal and wireless communication terminal Download PDFInfo
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- CN203446012U CN203446012U CN201320497782.5U CN201320497782U CN203446012U CN 203446012 U CN203446012 U CN 203446012U CN 201320497782 U CN201320497782 U CN 201320497782U CN 203446012 U CN203446012 U CN 203446012U
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Abstract
The utility model provides an audio signal processing circuit used for a wireless communication terminal and the wireless communication terminal. The audio signal processing circuit comprises an audio processing module of a base-band chip, an audio power amplifier, and an external loudspeaker. A voice stereo output interface of the base-band chip is connected to the input terminal of the audio power amplifier. The output terminal of the audio power amplifier is connected to the input terminal of the external loudspeaker. By employing the audio signal processing circuit of the utility model, voice signals are enabled to meet requirements on linear output of the base-band chip as well as requirements on amplitude of input voice signals of the lower-price audio power amplifier; the performance of the base-band chip is enabled to be fully exhibited; and the conversation sound quality is improved effectively.
Description
Technical field
The utility model relates to the audio signal processing circuit of wireless communication terminal, more particularly, relates to a kind of audio signal processing circuit that adopts stereo input mode to improve call tone quality.
Background technology
In traditional wireless communication terminal, while playing conversation voice by external loudspeaker during carrying out language call, voice signal is input to for driving the audio-frequency power amplifier of external loudspeaker by the difference output interface of base band master chip.Because difference input mode antijamming capability is stronger, can increase to call sound quality.
Fig. 1 is the audio signal processing circuit illustrating for the employing difference input mode of wireless communication terminal.As shown in Figure 1, adopt the audio signal processing circuit of difference input mode to comprise: the audio processing modules 101 of baseband chip, for driving audio-frequency power amplifier 102, the external loudspeaker 103 of external loudspeaker, the audio processing modules 101 of baseband chip has difference output interface 1 and difference output interface 2.As shown in Figure 1, while playing conversation voice by external loudspeaker during carrying out language call, the audio processing modules 101 of baseband chip is connected to voice signal the input of audio-frequency power amplifier 102 by difference output interface 1 and difference output interface 2, audio-frequency power amplifier 102 is exported to external loudspeaker 103 by the voice signal after amplifying again.
Baseband chip requires the amplitude of voice signal of output conventionally more than predetermined value, and guarantee baseband chip has good linear output.Because the difference output of the audio processing modules of baseband chip is what to form on the basis of Single-end output, therefore requiring output amplitude with the voice signal of single ended mode output in the situation that predetermined value is above, the amplitude of each component of the voice signal that requirement is exported with differential mode is also more than above-mentioned predetermined value, that is, the amplitude of the difference of two components is more than the above-mentioned predetermined value of twice.And for the low audio-frequency power amplifier of price comparison, owing to there is no the functional module (Non-Clip) of audio frequency dynamic process, the amplitude of the voice signal of General Requirements input is lower, make voice signal guarantee in effective amplitude undistorted, if the amplitude of the voice signal of input exceeds effective amplitude, the voice signal of input there will be distortion after audio-frequency power amplifier.Conventionally, for be input to the voice signal of this genus audio power amplifier with differential mode, in the situation that meet the amplitude of this genus audio power amplifier, require, cannot meet the linearity output requirement of baseband chip, make the performance of the baseband chip of processing audio can not give full play to and cause lower tone.
Utility model content
The purpose of this utility model, by the voice signal of baseband chip output, adopts stereo input mode to be input to audio-frequency power amplifier, improves call tone quality.
One side of the present utility model provides a kind of audio signal processing circuit for wireless communication terminal, it is characterized in that, described audio signal processing circuit comprises audio processing modules, audio-frequency power amplifier and the external loudspeaker of baseband chip, wherein, the stereo output interface of voice of described audio processing modules is connected to the input of audio-frequency power amplifier, and the output of described audio-frequency power amplifier is connected to the input of external loudspeaker.
Alternatively, the stereo output interface of voice comprises L channel output and R channel output, audio-frequency power amplifier comprises the first power amplifier and the second power amplifier, wherein, L channel output is connected to the input of the first power amplifier, and R channel output is connected to the input of the second power amplifier.
Alternatively, the output of the output of the first power amplifier or the second power amplifier is connected to the input of external loudspeaker.
Alternatively, described audio signal processing circuit also comprises synthesizer, the stereo output interface of voice comprises L channel output and R channel output, wherein, the L channel output of the stereo output interface of voice is connected to the first input end of synthesizer, the R channel output of the stereo output interface of voice is connected to the second input of synthesizer, and the output of synthesizer is connected to the input of audio-frequency power amplifier.
Alternatively, external loudspeaker comprises left channel loudspeaker and right channel loudspeaker, and wherein, the output of the first power amplifier is connected to the input of left channel loudspeaker, and the output of the second power amplifier is connected to the input of right channel loudspeaker.
Of the present utility modelly provide on the other hand a kind of wireless communication terminal with above-mentioned audio signal processing circuit.
According to audio signal processing circuit of the present utility model, make voice signal both can meet the requirement of the linear output of baseband chip, can meet again and there is no the amplitude requirement of the audio-frequency power amplifier of the functional module of audio frequency dynamic process (Non-Clip) to input speech signal, the performance of baseband chip is not fully exerted, effectively improves call tone quality.
Accompanying drawing explanation
By the detailed description of carrying out below in conjunction with accompanying drawing, above-mentioned and other objects, features and advantages of the present utility model will become apparent, wherein:
Fig. 1 is the audio signal processing circuit illustrating for the employing difference input mode of wireless communication terminal;
Fig. 2 is the audio signal processing circuit illustrating according to the stereo input mode of employing for wireless communication terminal of the utility model embodiment.
Embodiment
Below, describe with reference to the accompanying drawings embodiment of the present utility model in detail.
Conventionally, the audio processing modules of the baseband chip of wireless communication terminal has multiple output interface, for example, and voice output interface, multimedia audio output interface.Voice output interface is for exporting the voice during call, the audio frequency (audio frequency for example, producing while, playing MP3, MP4 file etc.) that multimedia audio output interface produces when exporting play multimedia file.
Voice output interface comprises the stereo output interface of voice (that is, Single-end output interface) and difference output interface, and difference output interface is for the output of earpiece speaker and external loudspeaker, and the stereo output interface of voice is for the output of earphone interface.The utility model is the output for external loudspeaker by the stereo output interface of the voice of the audio processing modules of baseband chip.
Fig. 2 is the audio signal processing circuit illustrating according to the stereo input mode of employing for wireless communication terminal of the utility model embodiment.
As shown in Figure 2, adopt the audio signal processing circuit of stereo input mode to comprise: the audio processing modules 201 of baseband chip, audio-frequency power amplifier 202, external loudspeaker 203, audio processing modules 201 has the stereo output interface 3 of voice.
As shown in Figure 2, the stereo output interface 3 of the voice of audio processing modules 201 is connected to the input of audio-frequency power amplifier 202.Audio processing modules 201 outputs to voice signal the input of audio-frequency power amplifier 202 by the stereo output interface 3 of voice, then audio-frequency power amplifier 202 is exported to the voice signal after amplifying the input of external loudspeaker 203 again.
In one embodiment, the stereo output interface 3 of voice comprises L channel output and R channel output, to export respectively L channel voice signal and R channel voice signal.Here, L channel output and R channel output are respectively Single-end output interface.Audio signal processing circuit also comprises synthesizer, the L channel output of the stereo output interface of voice is connected to the first input end of synthesizer, the R channel output of the stereo output interface of voice is connected to the second input of synthesizer, thereby synthesizer synthesizes L channel voice signal and R channel voice signal the voice signal of single sound channel.The output of synthesizer is connected to the input of audio-frequency power amplifier, so that synthetic voice signal is amplified.The output of audio-frequency power amplifier is connected to the input of external loudspeaker, thereby external loudspeaker is play the synthetic voice signal after amplifying.
In another embodiment, audio-frequency power amplifier 202 comprises the first power amplifier and the second power amplifier.The L channel output of the stereo output interface 3 of voice is connected to the input of the first power amplifier, the R channel output of the stereo output interface 3 of voice is connected to the input of the second power amplifier, thereby the first power amplifier amplifies L channel voice signal, the second power amplifier amplifies R channel voice signal.
The output of the output of the first power amplifier or the second power amplifier is connected to the input of external loudspeaker, thus the R channel voice signal after the L channel voice signal after external loudspeaker broadcasting is amplified or amplification.
In another embodiment, external loudspeaker comprises left channel loudspeaker and right channel loudspeaker.The output of the first power amplifier is connected to the input of left channel loudspeaker, the output of the second power amplifier is connected to the input of right channel loudspeaker, thereby left channel loudspeaker is play the L channel voice signal after amplifying, right channel loudspeaker is play the R channel voice signal after amplifying.
The audio processing modules of baseband chip conventionally require output voice signal output amplitude predetermined value (for example, 1V) more than, guarantee baseband chip has good linear output.Conventionally, for be input to the voice signal of this genus audio power amplifier with differential mode, in the situation that meet the amplitude of this power-like amplifier, require, cannot meet the linearity output requirement of baseband chip, make the performance of the baseband chip of processing audio can not give full play to and cause lower tone.And the input using the stereo output interface of the voice of baseband chip as audio-frequency power amplifier according to the audio signal processing circuit of embodiment of the present utility model, in the situation that guarantee that the linearity of baseband chip requires also to have met the amplitude requirement of audio-frequency power amplifier simultaneously.
Take MAX9877 power amplifier as example, and it does not contain the functional module (Non-Clip) of audio frequency dynamic process, and effective amplitude of the voice signal of requirement input is below 1.2V.At the stereo output interface of voice that adopts baseband chip, during as the input of audio-frequency power amplifier, the voltage range of the voice signal of input is 0V～1.2V, that is, amplitude is 1.2V.Like this, can guarantee that baseband chip has good linear output, meet the amplitude requirement of audio-frequency power amplifier simultaneously, compare with difference input mode, the performance of baseband chip can be given full play to, and effectively promotes the call tone quality of mobile phone.
Should be appreciated that, audio-frequency power amplifier 202 is that MAX9877 audio-frequency power amplifier is only exemplary, but is not limited to this.
Another embodiment of the present utility model provides a kind of wireless communication terminal, at this wireless communication terminal, includes above-described audio signal processing circuit.
Adopt audio signal processing circuit of the present utility model to make voice signal both can meet the requirement of the linear output of baseband chip, can meet again the amplitude requirement of low price audio-frequency power amplifier to input speech signal, the performance of baseband chip is not fully exerted, effectively improves call tone quality.
Although specifically shown with reference to its exemplary embodiment and described the utility model, but it should be appreciated by those skilled in the art, in the situation that do not depart from the spirit and scope of the present utility model that claim limits, can carry out the various changes in form and details to it.
Claims (6)
1. for an audio signal processing circuit for wireless communication terminal, it is characterized in that, described audio signal processing circuit comprises audio processing modules, audio-frequency power amplifier and the external loudspeaker of baseband chip,
Wherein, the stereo output interface of the voice of described audio processing modules is connected to the input of audio-frequency power amplifier, and the output of described audio-frequency power amplifier is connected to the input of external loudspeaker.
2. the audio signal processing circuit for wireless communication terminal according to claim 1, it is characterized in that, the stereo output interface of voice comprises L channel output and R channel output, audio-frequency power amplifier comprises the first power amplifier and the second power amplifier, wherein, L channel output is connected to the input of the first power amplifier, and R channel output is connected to the input of the second power amplifier.
3. the audio signal processing circuit for wireless communication terminal according to claim 2, is characterized in that, the output of the output of the first power amplifier or the second power amplifier is connected to the input of external loudspeaker.
4. the audio signal processing circuit for wireless communication terminal according to claim 1, it is characterized in that, described audio signal processing circuit also comprises synthesizer, the stereo output interface of voice comprises L channel output and R channel output, wherein, the L channel output of the stereo output interface of voice is connected to the first input end of synthesizer, the R channel output of the stereo output interface of voice is connected to the second input of synthesizer, and the output of synthesizer is connected to the input of audio-frequency power amplifier.
5. the audio signal processing circuit for wireless communication terminal according to claim 2, it is characterized in that, external loudspeaker comprises left channel loudspeaker and right channel loudspeaker, wherein, the output of the first power amplifier is connected to the input of left channel loudspeaker, and the output of the second power amplifier is connected to the input of right channel loudspeaker.
6. a wireless communication terminal with audio signal processing circuit claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320497782.5U CN203446012U (en) | 2013-08-14 | 2013-08-14 | Audio signal processing circuit used for wireless communication terminal and wireless communication terminal |
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| CN201320497782.5U CN203446012U (en) | 2013-08-14 | 2013-08-14 | Audio signal processing circuit used for wireless communication terminal and wireless communication terminal |
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| CN203446012U true CN203446012U (en) | 2014-02-19 |
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| CN201320497782.5U Expired - Lifetime CN203446012U (en) | 2013-08-14 | 2013-08-14 | Audio signal processing circuit used for wireless communication terminal and wireless communication terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017215237A1 (en) * | 2016-06-12 | 2017-12-21 | 深圳奥尼电子股份有限公司 | 3d sound effect processing circuit for earphone or earplug, and processing method therefor |
-
2013
- 2013-08-14 CN CN201320497782.5U patent/CN203446012U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017215237A1 (en) * | 2016-06-12 | 2017-12-21 | 深圳奥尼电子股份有限公司 | 3d sound effect processing circuit for earphone or earplug, and processing method therefor |
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Granted publication date: 20140219 |
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