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An electronic device, its audio processing circuit, and an audio signal output method

An audio signal and audio output technology, which is applied in the field of electronic equipment and its audio processing circuit, and audio signal output, can solve problems such as difficult to meet the performance requirements of connecting high-impedance equipment, limit the application range of terminal equipment, etc., and achieve improved audio output Performance, space savings, and hardware cost reduction effects

Active Publication Date: 2017-08-15
VIVO MOBILE COMM CO LTD
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Problems solved by technology

Existing mobile terminal devices, such as smart phones, tablet computers / PADs, etc., usually have audio playback functions, but limited by the size of the device, usually only have a 3.5mm headphone output interface, and there is no line output interface. As a result, it is difficult to meet the performance requirements when connecting high-impedance equipment, which limits the application range of terminal equipment

Method used

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  • An electronic device, its audio processing circuit, and an audio signal output method
  • An electronic device, its audio processing circuit, and an audio signal output method
  • An electronic device, its audio processing circuit, and an audio signal output method

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Embodiment Construction

[0023] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0024] The load impedance and output current of the headphone output interface and the line output interface are different. For example, the headphone output interface has a small load impedance and a large current; while the line output interface generally has a slightly larger load impedance and a small current. When the output interface is connected to a load device with a mismatched impedance, it is difficult to ensure high audio performance. However, devices such as mobile terminals in the prior art are limited by their size / space, and can only be equipped with a small output interface, such as a 3.5mm headphone output interface, and therefore cannot be applied to a power amplifier connection.

[0025] In view of the above shortcoming...

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Abstract

The present invention provides an electronic device, an audio processing circuit thereof, and an audio signal output method. The audio processing circuit comprises an operational amplifier unit whose input end receives an analog audio signal to be processed and whose output end is connected to an output interface so as to output a processed analog audio signal, a first peripheral feedback circuit which outputs a standard feedback first control signal according to the first audio signal, a second peripheral feedback circuit which outputs a standard feedback second control signal according to the second audio signal, and a switch circuit which outputs the first control signal or the second control signal to the input end of the operational amplifier unit, wherein one end of the first peripheral feedback circuit is connected to the output end of the operational amplifier unit, the other end is connected to the switch circuit, one end of the second peripheral feedback circuit is connected to the output end of the operational amplifier unit, the other end is connected to the switch circuit. According to the invention, the output of audio signals of different driving standards by one output interface is realized, the audio output interface function of the electronic device is expanded, and the device space and cost are saved.

Description

Technical field [0001] The invention relates to the technical field of audio processing, in particular to an electronic device, an audio processing circuit thereof, and an audio signal output method. Background technique [0002] Professional audio playback equipment is usually provided with a headphone output interface and a line output interface. Among them, the headphone output interface is characterized by the large drive current output by the interface, which is suitable for connecting to lower impedance peripherals; the line output interface is characterized by the large signal voltage and small current output by the interface, and the output indicators are usually excellent To the headphone output interface. In addition, the headphone output interface is generally a 3.5mm headphone jack or a 6.35mm headphone jack, and the line output interface is generally an RCA (Radio Corporation of American) interface, also known as a lotus plug. [0003] In practical applications, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 吴晓光王友飞于猛
Owner VIVO MOBILE COMM CO LTD
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