This paper discusses optimizing noise shaping, with or without dither, using filtered error-feedback round a quantizer. We show that any desired noise frequency spectrum can be approximated arbitrarily well. The optimal (i.e. minimum) noise level for a given spectrum is shown to be obtained if the error-feedback filter satisfied a "causality" type condition, and the noise level is that that preserves the digital channel's Shannon information capacity. Uses for optimizing a wide range of digital audio systems are discussed.
Authors:
Gerzon, Michael A.; Craven, Peter G.
Affiliation:
Algol Applications, Grove, Wantage Oxon, England
AES Convention:
87 (October 1989)
Paper Number:
2822
Publication Date:
October 1, 1989
Subject:
Digital Audio Electronics
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