Coding of Stereo Signals by a Single Digital {\Delta}{\Sigma} Modulator

摘要

The possibility of using a single digital {\Delta}{\Sigma} modulator tosimultaneously encode the two channels of a stereo signal is illustrated. Fromthe modulated stream, the two channels can be recovered with minimal processingand no cross-talk. Notably, demultiplexing does not affect the sample-depth sothat, after it, one still has a data stream suitable for directly driving apower bridge and convertible into analog by mere low-pass filtering.Furthermore, the approach is very flexible and if one channel is unused, itlets the other get improved dynamic range and SNR. The approach can takeadvantage of recent techniques for the design of {\Delta}{\Sigma} modulators,including methods for psychoacoustically optimal distribution of quantizationnoise. Code is available to replicate the proposed examples and as a generalcomputer aided design tool.