CN204616068U - A kind of audio frequency processing circuit and mobile terminal - Google Patents
A kind of audio frequency processing circuit and mobile terminal Download PDFInfo
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- CN204616068U CN204616068U CN201520297659.8U CN201520297659U CN204616068U CN 204616068 U CN204616068 U CN 204616068U CN 201520297659 U CN201520297659 U CN 201520297659U CN 204616068 U CN204616068 U CN 204616068U
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Abstract
The utility model belongs to communication technical field, comprise application processor and operational amplifier unit, also at least comprise first sound road digital to analog converter and second sound channel digital to analog converter, described application processor is connected with the first input end of described operational amplifier unit by described first sound road digital to analog converter, and described application processor is connected by second input of described second sound channel digital to analog converter with described operational amplifier unit.The utility model additionally provides a kind of mobile terminal, employs above-mentioned audio frequency processing circuit.The audio frequency processing circuit that the utility model provides and mobile terminal have good music quality.
Description
Technical field
The utility model relates to communication technical field, particularly relates to a kind of audio frequency processing circuit and mobile terminal.
Background technology
Please refer to Fig. 1, the audio frequency processing circuit of existing mobile terminal comprises application processor (the Application Processor connected successively, AP) 01, digital to analog converter (Digital to AnalogConverter, DAC) unit 02, operational amplifier (Operational Amplifier, OPA) unit 03 and power amplifier (Power Amplifier, PA) unit 04, wherein, operational amplifier unit 03 is packaged with multiple operational amplifier, Power Amplifier Unit 04 is packaged with multiple power amplifier, application processor 01 is for decoding to music source file, obtain PCM (Pulse CodeModulation, pulse code modulation) code stream, and be converted into format, be sent to digital to analog converter unit 02 and carry out digital-to-analogue conversion, analogue data is transferred to each operational amplifier in operational amplifier unit 03 by digital to analog converter unit 02 by sound channel difference, export earphone etc. to after the power amplifier of each sound channel signal after being amplified by operational amplifier by the correspondence in Power Amplifier Unit 04 to put outward.
Because existing audio frequency processing circuit adopts a number analog converter unit 02 pair of music source file to process, signal to noise ratio is low, and existing multiple operational amplifier is packaged in an operational amplifier unit 03, multiple power amplifier package is in a Power Amplifier Unit 04, make easily to produce crosstalk between operational amplifier, between power amplifier, affect music overall dynamic range and played in stereo performance.
Utility model content
For overcoming the problem of prior art sound intermediate frequency play quality difference, the utility model embodiment provides a kind of audio frequency processing circuit on the one hand, comprise application processor and operational amplifier unit, also at least comprise first sound road digital to analog converter and second sound channel digital to analog converter, described application processor is connected with the first input end of described operational amplifier unit by described first sound road digital to analog converter, and described application processor is connected by second input of described second sound channel digital to analog converter with described operational amplifier unit.
On the other hand, the utility model embodiment still provides a kind of mobile terminal, comprises audio frequency processing circuit described above.
The utility model embodiment by providing at least first sound road digital to analog converter to be that the first sound channel signal in music source file carries out processing, second sound channel digital to analog converter is that second sound channel signal in music source file processes, relative to existing odd number weighted-voltage D/A converter scheme, can effectively reduce interelement crosstalk, improve signal to noise ratio, improve overall dynamic range and stereo performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of existing audio frequency processing circuit;
Fig. 2 is the structural representation of the utility model audio frequency processing circuit first embodiment;
Fig. 3 is the structural representation of the utility model audio frequency processing circuit second embodiment.
Embodiment
The technical problem solved to make the utility model, technical scheme and beneficial effect are clearly understood, below in conjunction with drawings and Examples, are further elaborated to the utility model.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " contact " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition the concrete meaning of above-mentioned term in the utility model can be understood.
When the utility model embodiment mentions the ordinal number such as " first ", " second ", unless the meaning of based on context its certain order of representation, should be understood to has been only the use of differentiation.
Please refer to Fig. 2, is the structural representation of the utility model audio frequency processing circuit first embodiment.
A kind of audio frequency processing circuit, comprise application processor 11 and operational amplifier unit 14, also at least comprise first sound road digital to analog converter 12 and second sound channel digital to analog converter 13, application processor 11 is connected with the first input end of operational amplifier unit 14 by first sound road digital to analog converter 12, and application processor 11 is connected with the second input of operational amplifier unit 14 by second sound channel digital to analog converter 13.
In the present embodiment, application processor 11 is for decoding to music source file, obtain PCM (Pulse Code Modulation, pulse code modulation) code stream, and be converted into format (the present embodiment can be I2S form), by I2S (Inter IC Sound, integrated circuit built-in audio bus) audio signal of form is sent to first sound road digital to analog converter 12 and second sound channel digital to analog converter 13, first sound road digital to analog converter 12 can extract the first sound channel signal (can be left channel signals in the present embodiment) from the audio signal of I2S form, second sound channel digital to analog converter 13 can extract second sound channel signal (can be right-channel signals in the present embodiment) from the audio signal of I2S form.Operational amplifier unit 14 receives left channel signals and right-channel signals, and carries out signal amplification respectively to it.
In the present embodiment, operational amplifier unit 14 can also be connected with Power Amplifier Unit 15, Power Amplifier Unit 15 for carrying out power amplification respectively to the left channel signals after the amplification of operational amplifier unit 14 signal and right-channel signals, and finally outputs to the audio frequency broadcasting elements such as earphone.
The utility model embodiment by providing at least first sound road digital to analog converter to be that the first sound channel signal in music source file carries out processing, second sound channel digital to analog converter is that second sound channel signal in music source file processes, relative to existing odd number weighted-voltage D/A converter scheme, can effectively reduce interelement crosstalk, improve signal to noise ratio, improve overall dynamic range and stereo performance.
Please refer to Fig. 3, is the structural representation of the utility model audio frequency processing circuit second embodiment.
A kind of audio frequency processing circuit, comprise application processor 21, first sound road digital to analog converter 22, second sound channel digital to analog converter 23, also comprise the first sound channel operational amplifier 24 and second sound channel operational amplifier 25, application processor 21 is connected with the first sound channel operational amplifier 24 by first sound road digital to analog converter 22, and application processor 21 is connected with second sound channel operational amplifier 25 by second sound channel digital to analog converter 23.
In the present embodiment, application processor 21 is for decoding to music source file, obtain PCM (Pulse Code Modulation, pulse code modulation) code stream, and be converted into format (the present embodiment can be I2S form), the audio signal of I2S form is sent to first sound road digital to analog converter 22 and second sound channel digital to analog converter 12, first sound road digital to analog converter 22 can extract the first sound channel signal (can be left channel signals in the present embodiment) from the audio signal of I2S form, second sound channel digital to analog converter 23 can extract second sound channel signal (can be right-channel signals in the present embodiment) from the audio signal of I2S form.In the present embodiment, left channel signals can be sent to the first sound channel operational amplifier 24 by first sound road digital to analog converter 22, and right-channel signals can be sent to second sound channel operational amplifier 25 by second sound channel digital to analog converter 23.
The audio frequency processing circuit of the utility model embodiment also comprises the first channel power amplifier 26 and the second sound channel power amplifier 27 of discrete setting, first channel power amplifier 26 is connected to the output of the first sound channel operational amplifier 24, and second sound channel power amplifier 27 is connected to the output of second sound channel operational amplifier 25.In the present embodiment, the first sound channel operational amplifier 24 or second sound channel operational amplifier 25 comprise operational amplification circuit and filter circuit.First sound channel operational amplifier 24 is amplified by signal and filtered left channel signals exports the first channel power amplifier 26 to, and second sound channel operational amplifier 25 is amplified by signal and filtered right-channel signals exports second sound channel power amplifier 27 to.First channel power amplifier 26 and second sound channel power amplifier 27 play element to exporting the audio frequency such as earphone after left channel signals and right-channel signals power amplification to respectively.
The utility model embodiment is by using operational amplifier and the power amplifier of discrete setting, can avoid existing because operational amplifier and power amplifier being integrated in the problem causing interelement signal cross-talk in a device package, compared to the first embodiment, improve overall dynamic range and stereo performance further, simultaneously, adopt the operational amplifier of operational amplification circuit and filter circuit can effectively reduce audio signal distortion, improve audio playback quality.
The utility model embodiment still provides a kind of mobile terminal, employs above-mentioned audio frequency processing circuit.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, as: the utility model is not limited to only comprise the first digital to analog converter, second digital to analog converter, first operational amplifier, second operational amplifier, first power amplifier, second power amplifier etc., as when output 2.1 channel audio, the 3rd digital to analog converter can also be comprised, 3rd operational amplifier, 3rd power amplifier etc., when exporting 5.1 or 7.1 channel audio, the digital to analog converter corresponding to number of channels can also be comprised, operational amplifier, power amplifier etc.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. an audio frequency processing circuit, comprise application processor and operational amplifier unit, it is characterized in that, also comprise first sound road digital to analog converter and second sound channel digital to analog converter, described application processor is connected with the first input end of described operational amplifier unit by described first sound road digital to analog converter, and described application processor is connected by second input of described second sound channel digital to analog converter with described operational amplifier unit.
2. audio frequency processing circuit as claimed in claim 1, it is characterized in that, described operational amplifier unit at least comprises the first sound channel operational amplifier and the second sound channel operational amplifier of discrete setting, described application processor is connected with described first sound channel operational amplifier by described first sound road digital to analog converter, and described application processor is connected with described second sound channel operational amplifier by described second sound channel digital to analog converter.
3. audio frequency processing circuit as claimed in claim 2, it is characterized in that, it also comprises the first channel power amplifier and the second sound channel power amplifier of discrete setting, described first channel power amplifier is connected to the output of described first sound channel operational amplifier, and described second sound channel power amplifier is connected to the output of described second sound channel operational amplifier.
4. audio frequency processing circuit as claimed in claim 2 or claim 3, it is characterized in that, described first sound channel or second sound channel operational amplifier comprise operational amplification circuit and filter circuit.
5. a mobile terminal, is characterized in that, comprises the audio frequency processing circuit described in any one of Claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520297659.8U CN204616068U (en) | 2015-05-09 | 2015-05-09 | A kind of audio frequency processing circuit and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520297659.8U CN204616068U (en) | 2015-05-09 | 2015-05-09 | A kind of audio frequency processing circuit and mobile terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018082233A1 (en) * | 2016-11-04 | 2018-05-11 | 捷开通讯(深圳)有限公司 | Apparatus and method for achieving audio conversion stereo |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018082233A1 (en) * | 2016-11-04 | 2018-05-11 | 捷开通讯(深圳)有限公司 | Apparatus and method for achieving audio conversion stereo |
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