Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2000-07-13
2009-02-03
Opsasnick, Michael N (Department: 2626)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S215000, C704S217000
Reexamination Certificate
active
07487083
ABSTRACT:
A method and an apparatus accurately discriminates between speech and voice-band data (VBD) in a communication network by calculating self similarity ratio (SSR) values, which indicate periodicity characteristics of an input signal segment, and/or autocorrelation coefficients, which indicate spectral characteristics of an input signal segment, to generate a speech/VBD discrimination result. In one implementation, the speech-VBD discriminating apparatus calculates both short-term delay and long-term delay SSR values to analyze the repetition rate of an input signal frame, thereby indicating whether the input signal frame has the periodicity characteristics of a typical speech signal or a VBD signal. The speech-VBD discriminating apparatus further calculates a plurality of short-term autocorrelation coefficients to determine the spectral envelope of an input frame, thereby facilitating accurate speech/VBD discrimination. According to one implementation of the present invention, the speech-VBD discriminating apparatus relies on sequential decision logic which improves classification performance by recognizing that changes from speech to VBD or vice versa in a communication medium are unlikely, and discounts discrimination results for relatively low-power signal portions which are more susceptible to errors to further improve discrimination accuracy.
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Alcatel-Lucent USA Inc.
Opsasnick Michael N
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