Variable frequency decoding apparatus for efficient power management in a portable audio device
First Claim
1. A variable frequency decoding apparatus for efficient power management in a portable audio device, comprising:
- a decoder which simultaneously outputs audio information including a bit rate and a sampling frequency of a data frame to a clock generator when audio compressed data is received, wherein the clock generator has an input connected to the decoder for receiving the audio information, such that an operation frequency of the sys clock can be changed to match the sampling frequency and the bit rate of the data frame for decoding with optimal performance.
1 Assignment
0 Petitions
Accused Products
Abstract
A variable frequency decoding apparatus operable in a portable audio device that can improve the power management is disclosed. The above apparatus has a decoder and a clock generator that provides the system clock for the decoder. When a bit stream representing audio compressed data is received, the decoder simultaneously provides the audio information embedded in the audio compressed data such as the bit rate and the sampling frequency of the data frame to the clock generator, and then the clock generator adjusts the clock signals; which are used by the decoder to restore to the original PCM format, to match the audio information embedded in the data frame. This audio signal compression technique can prevent possible output delay and reduce power consumption as compared with the conventional way that used a fixed sys clock.
-
Citations
7 Claims
-
1. A variable frequency decoding apparatus for efficient power management in a portable audio device, comprising:
a decoder which simultaneously outputs audio information including a bit rate and a sampling frequency of a data frame to a clock generator when audio compressed data is received, wherein the clock generator has an input connected to the decoder for receiving the audio information, such that an operation frequency of the sys clock can be changed to match the sampling frequency and the bit rate of the data frame for decoding with optimal performance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
Specification