Patent ID: 7496417
Filing Date: 2009-02-24
Classification: H04S

Abstract:
1. An audio processing system for use in a multi-channel audio chip, the audio processing system comprising: a multiplexer for receiving a plurality of digital signals and selectively outputting the digital signals in a time-division manner according to a first control signal; a digital-to-analog converter for receiving the digital signals in the time-division manner and converting the digital signals into a plurality of analog signals, wherein each of the digital signals is corresponding to one of the analog signals; a plurality of sample-and-hold circuits for selectively sampling the corresponding analog signals in the time-division manner and holding the corresponding analog signals for a predetermined period of time according to a second control signal, wherein each of the sample-and-hold circuits is corresponding to one of the analog signals; a plurality of speakers for amplifying the analog signals and outputting the amplified analog signals, wherein each of the speakers is corresponding to one of the analog signals; a controller for outputting the first and the second control signals to control operations of the multiplexer and the sample-and-hold circuits; and a de-multiplexer, coupled to the digital-to-analog converter, for receiving the corresponding analog signals and selectively outputting the corresponding analog signals to the sample-and-hold circuits in the time-division manner according to a third control signal.