Automatic speech/speaker recognition over digital wireless channels
First Claim
1. A method for automatically recognizing speech received as coded speech signals in a first set of signals received from a wireless transmission channel comprising the steps ofextracting a plurality of speech feature signals from said received coded speech signals separately from any conversion of said received coded speech signals to audio speech signals, and applying said plurality of speech feature signals to a speech recognition system, wherein said received coded speech signals comprise a plurality of coded speech parameters and said extracting comprises selecting a subset of said received coded speech parameters, and converting said subset of said received coded speech parameters to said plurality of speech feature signals.
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Abstract
Automatic Speech Recognition (ASR) is achieved in wireless communications systems in which reliable ASR feature vector sequences are derived at a base station directly from digitally transmitted speech coder parameters, with no additional processing or signal modification required at the originating handset. No secondary channel need be provided for the transmission of ASR feature vectors. In operating on received speech coder parameters prior to conversion to a voice signal the present system and methods avoid the lossy conversion process and associated voice distortion. Since the received voice parameters are error protected during transmission they are received with greater accuracy.
All, or a subset, of speech coding parameters, including, in appropriate cases, spectral envelope parameters, reflection coefficients, LSPs, LSFs, LPCs, LPCCs, and weighted LPCCs may be processed at a receiving base station or forwarded to another location for processing.
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Citations
16 Claims
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1. A method for automatically recognizing speech received as coded speech signals in a first set of signals received from a wireless transmission channel comprising the steps of
extracting a plurality of speech feature signals from said received coded speech signals separately from any conversion of said received coded speech signals to audio speech signals, and applying said plurality of speech feature signals to a speech recognition system, wherein said received coded speech signals comprise a plurality of coded speech parameters and said extracting comprises selecting a subset of said received coded speech parameters, and converting said subset of said received coded speech parameters to said plurality of speech feature signals.
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12. A system for automatically recognizing speech received as coded speech signals in a first set of signals received from a wireless transmission channel comprising
means for extracting a plurality of speech feature signals from said received coded speech signals separately from any conversion of said received coded speech signals to audio speech signals, and means for applying said plurality of speech feature signals to a speech recognition system, wherein said received coded speech signals comprise a plurality of coded speech parameters, and said means for extracting comprises means for selecting a subset of said received coded speech parameters, and means for converting said subset of said received coded speech parameters to said plurality of speech feature signals.
Specification