Patent ID: 6741961
Filing Date: 2004-05-25
Classification: G06F,H04S

Abstract:
A low power audio processor comprising:a bit stream processing unit for bit processing an applied audio stream into a bit processed audio stream and for decoding the bit processed audio stream to have a format conducive to digital signal processing; a digital signal processing unit for digital signal processing the decoded bit processed audio stream received from the bit stream processing unit to develop a digital signal processed audio stream: a post processing unit for receiving the digital signal processed audio stream from the digital signal processing unit to develop final audio data; a host interface unit for interfacing with an external device to provide an audio parallel stream received from the external device to the bit stream processing unit; a power control unit for determining a power state for each of the bit stream processing unit, the digital signal processing unit and the post processing unit in response to: (1) a request signal and an acknowledge signal between the digital signal processing unit and the post processing unit, (2) a power down signal, and (3) a source clock, the power control unit outputting a determined power state as a power mode signal; and an internal clock signal generator unit for receiving the source clock and the power down signal and generating clock signals, each of the clock signals corresponding to a respective one of the bit stream processing unit, the digital signal processing unit and the post processing unit.