A share audio power amplification circuit for multi-audio source and its control method

A multi-source, audio technology, applied in the direction of power amplifier, speaker distribution signal, etc.

Active Publication Date: 2008-08-13
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem solved by the present invention is to provide an audio power amplifier circuit shared by multiple sound sources and its control method, so as to achieve the problem of saving hardware cost and power consumption without increasing software complexity and affecting user experience

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  • A share audio power amplification circuit for multi-audio source and its control method
  • A share audio power amplification circuit for multi-audio source and its control method
  • A share audio power amplification circuit for multi-audio source and its control method

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Embodiment Construction

[0025] The present invention provides an audio power amplifier circuit shared by multiple sound sources and its control method, so as to save hardware cost and power consumption without increasing software complexity and affecting user experience. Specific embodiments are described in detail below, but not as a limitation to the present invention.

[0026] The present invention does not need to make changes to the originally adopted software. The main feature of the present invention is that although the multi-audio source hardware and signal characteristics are very different, the audio PA and Speaker are still shared, the difference in the volume of each audio source is within a controllable range, and the volume of each audio source is passed through The software is continuously adjustable, and the granularity of adjustment is also within a controllable range. On the hardware of the circuit, it is only necessary to add multi-audio source output series resistors and analog ...

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Abstract

The invention discloses a acoustic power amplifier circuit for multiple audio source sharing, including output circuit of audio source, input circuit of differential audio power amplifier, feedback circuit of differential audio power amplifier, differential audio power amplifier, baseband processor and loudhailer. Series resistance for multiple audio source output, analogue switch is also included, wherein one end of series resistance for multiple audio source output is connected to corresponding output circuit of multiple audio source, which is used for receiving output audio signal from output circuit of multiple audio source and compensating output resistance; the other end of series resistance for multiple audio source output is connected to analogue switch, and the other end of analogue switch is connected to input circuit of differential audio power amplifier, wherein the analogue switch is used for switching series resistance for multiple audio source output to output audio signal of multiple audio source to differential audio power amplifier output circuit. The baseband processor is connected to analogue switch, which is used for analogue switch to control switching channel of audio signal of multiple audio source, and complete modulation and demodulation of baseband signal. The invention realize consistence of output volume from multiple audio source and adjustment range of the terminal device with low cost.

Description

technical field [0001] The invention relates to a multi-sound source audio signal switching technology and a gain control method thereof, in particular to a circuit in which multiple sound sources share one audio power amplifier on the same terminal device and a control method for the circuit. Background technique [0002] At present, the industry needs to implement multiple audio sources on terminal equipment. For example, on music phones, it is usually required to implement mp3 music and FM stereo broadcasting, and at the same time support the function of hands-free calls. These audio signals from different audio sources need to be switched using audio channels controlled by analog switches, so that in different scenarios, the corresponding audio signals are input to the post-stage audio power amplifier (Audio Power Amplifier, hereinafter referred to as audio PA) to share the same audio PA and the same speaker (Speaker) achieve external playback. [0003] Generally speaki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/12H03F3/20
Inventor 马驰张晓峰时慧钦薛华胡卫东
Owner ZTE CORP
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