Automatic gain control in a speech recognition system
US6314396A · kind A · utility
108Cited by
12References
21Claims
0Family size
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Key dates
| Filing date | Nov 6, 1998 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Nov 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L15/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.