Automatic gain control in a speech recognition system

Automatic gain control in a speech recognition system

Energy normalization in a speech recognition system is achieved by adaptively tracking the high, mid, and low energy envelopes, wherein the adaptive high energy tracking value adapts with weighting enhanced for high energies, and the adaptive low energy tracking value adapts with weighting enhanced...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: MONKOWSKI MICHAEL D
Format: Patent
Sprache:eng
Schlagworte:
ACOUSTICS
MUSICAL INSTRUMENTS
PHYSICS
SPEECH ANALYSIS OR SYNTHESIS
SPEECH OR AUDIO CODING OR DECODING
SPEECH OR VOICE PROCESSING
SPEECH RECOGNITION
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Beschreibung
Zusammenfassung:Energy normalization in a speech recognition system is achieved by adaptively tracking the high, mid, and low energy envelopes, wherein the adaptive high energy tracking value adapts with weighting enhanced for high energies, and the adaptive low energy tracking value adapts with weighting enhanced for low energies. A tracking method is also provided for discriminating waveform segments as being one of "speech" or "silence", and a measure of the signal to noise ratio and absolute noise floor are used as feedback means to achieve optimal speech recognition accuracy.