Patent ID: 6560497
Filing Date: 2003-05-06
Classification: H04S

Abstract:
An audio signal processing and reproducing system, comprising:converting means for converting analog audio signals of multiple channels into multiple digital data streams corresponding to the multiple channels, the multiple digital data streams having original maximum levels which are different from each other; producing means for producing level-shift control data responsive to a highest level among the original maximum levels of the multiple digital data streams; level-shifting means for shifting levels of all the multiple digital data streams by a determined amount determined by the level-shift control data and resulting level-shifted data streams corresponding to the multiple channels; modulating means for modulating the level-shifted data streams and the level-shift control data to produce a modulated signal to be recorded on a recording medium including a DVD-audio disc; means for recording the modulated signal of the level-shifted data streams and the level-shift control data on the recording medium; demodulating means for demodulating the modulated signal to reproduce the signal of the level-shifted data streams and the level-shift control data recorded; recovering means for recovering the original maximum levels of the multiple digital data streams by adjusting levels thereof responsive to the level-shift control data demodulated; and outputting means for outputting the multiple digital data streams having the original maximum levels thus recovered.