Patent ID: 6763275
Filing Date: 2004-07-13
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; coding means for coding the level-shifted data streams and the level-shift control data to produce a packed data stream to be recorded; modulating means for modulating the packed data of 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 packed data of the level-shifted data streams and the level-shift control data on the recording medium; demodulating means for demodulating the modulated packed data to reproduce the signal of the level-shifted data streams and the level-shift control data recorded; decoding means for decoding the packed data stream to reproduce the level-shifted data streams and the level-shift control data; 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 decoded; and outputting means for outputting the multiple digital data streams having the original maximum levels thus recovered.