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Method and device for multi sound source sharing audio power amplifier

A multi-sound source and audio technology, applied in the field of audio power amplifier devices, can solve the problems of high hardware cost and power consumption, and high software complexity, and achieve the effects of low hardware cost, good user experience, and small workload.

Active Publication Date: 2008-07-30
ZTE CORP
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0010] In view of this, one of the purposes of the present invention is to provide a circuit device in which multiple audio sources share the same audio PA on terminal equipment, so as to solve the technical problems of large software complexity, high hardware cost and high power consumption in the existing software and hardware solutions.

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  • Method and device for multi sound source sharing audio power amplifier

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Embodiment Construction

[0032] The implementation principle and specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] The present invention is divided into seven parts on the circuit: (1) multi-tone source output circuit, is used for multi-tone source output audio signal. (2) The analog switch is used to switch the multi-source audio signal to the differential audio PA input terminal. (3) Audio PA input circuit, that is, the input resistance-capacitance coupling circuit of the audio PA. (4) Audio PA feedback circuit, that is, a feedback circuit composed of a digital potentiometer and a filter capacitor. (5) Audio PA. (6) Speakers. (7) The baseband processor is used to control multi-source audio switching channels, and complete other functions such as baseband signal modulation and demodulation.

[0034] The basic principle of the present invention is: the gain of audio frequency PA is determined by the ratio of outp...

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Abstract

The invention relates to a device and a method for a plurality of sound sources to share an audio power amplifier on the same terminal, which solves the technical problems of great software complexity, high hardware cost and power consumption in the plan that a plurality of sound sources share one audio power amplifier. The core idea of the invention is that a feedback circuit of the audio power amplifier can adopt an adjustable digital potentiometer, and a baseband processor adjusts the digital potentiometer according to the different sound sources characteristics to achieve the purpose of adjusting the gain value of the audio power amplifier. The invention provides a thorough solution to the volume differences between different sound sources caused by the hardware and signal characteristics, thus improving the acoustic effects.

Description

technical field [0001] The present invention relates to a multi-sound source audio signal switching technology and a gain control method thereof, in particular to a device and method in which multiple sound sources share one audio power amplifier on the same terminal equipment. 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 to achieve external playback. [0003] Generally speaking, the audio PA will p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00
Inventor 马驰
Owner ZTE CORP
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