Patent
1995-10-26
1997-11-25
MacDonald, Allen R.
G10L 700
Patent
active
056921020
ABSTRACT:
The present invention provides a device, method and system of noise injection to maximize compressed audio quality while enabling bitrate scalability. It includes at least one of an encoder and a decoder. The encoder includes a zero detection unit, coupled to receive a frequency domain quantized signal, for determining a control signal that indicates whether noise injection is implemented and a normalization computation unit, coupled to receive at least unquantized signal values and the control signal, for determining a normalization term in accordance with the control signal. The decoder includes a zero detection unit, coupled to receive a frequency domain quantized signal, for determining a control signal that indicates when noise injection is active and a noise generation and normalization unit, coupled to receive a normalization term and the control signal, for generating, normalizing, and injecting a predetermined noise signal where indicated by the control signal.
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Parsons; Voice and Speech Processing; Chapter 9, "Speech compression;" McGraw-Hill, Inc.; pp. 228-229, 1987.
MacDonald Allen R.
Motorola Inc.
Stockley Darleen J.
Wieland Susan
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