Audio signal processing method and related device with block order switching

DETAILED DESCRIPTION The present invention offers a method for processing the analog audio signal and a signal processing unit for suppressing the noise which is likely to occur as a result of scrambling, and preventing deterioration of sound quality without requiring substantial changes in hardware or software The principle of the audio signal processing method of the present invention is as follows.
First, an analog audio signal is converted to a digital audio signal using a clock pulse generated from a timing signal synchronized to the vertical synchronizing signal of the television or video signal.
Then, data of the digitized signals is blocked into specified groups.
Scrambling is applied to the data by switching the order of adjacent odd and even blocks.
Conversely, for descrambling, the switched odd and even blocks are replaced in their original order for reproducing the original audio signal data.
Noise and deterioration of sound quality may occur near the boundary of each block due to the blocking process of the audio signal data and switching of the order of odd and even blocks.
The present invention adds protection data before and after each data block boundary before scrambling to reduce noise and deterioration of sound quality caused by discontinuity around each block boundary.