Coded data generation or conversion – Analog to digital conversion followed by digital to analog...
Patent
1997-02-11
1998-09-15
Williams, Howard L.
Coded data generation or conversion
Analog to digital conversion followed by digital to analog...
3647241, H03M 100
Patent
active
058085742
ABSTRACT:
An electronic method and apparatus for signal encoding and decoding to provide ultra low distortion reproduction of analog signals, while remaining compatible with industry standardized signal playback apparatus not incorporating the decoding features of the invention, and wherein the improved system provides an interplay of gain, slew rate and wave synthesis operations to reduce signal distortions and improve apparent resolution, all under the control of concealed control codes for triggering appropriate decoding signal reconstruction compensation complementing the signal analysis made during encoding. In addition, signals lacking the encoding process features of the invention are likewise compatible with playback decoders which do embody the invention, to provide some overall restoration enhancement.
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John Vanderkooy & Stanley P. Lipshitz, Dither In Digital Audio, 8013 Journal of the Audio Engineering Society 35 (1987) Dec., No. 12, New York, New York.
Johnson Keith O.
Pflaumer Michael W.
Pacific Microsonics, Inc.
Williams Howard L.
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