Method device and system for an efficient noise injection proces

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G10L 700

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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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patent: 5185800 (1993-02-01), Mahieux
patent: 5222189 (1993-06-01), Fielder
patent: 5533052 (1996-07-01), Bhaskar
patent: 5553193 (1996-09-01), Akagiri
Parsons; Voice and Speech Processing; Chapter 9, "Speech compression;" McGraw-Hill, Inc.; pp. 228-229, 1987.

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