Distributed voice recognition system
First Claim
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1. A method for providing voice recognition in a wireless communication system, the method comprising the steps of:
- providing a speech signal spoken by a user to a feature extractor located at a subscriber station;
extracting a set of speech features from the speech signal in accordance with a predetermined feature extraction format;
determining a speech meaning from the extracted speech features in accordance with a small vocabulary that is locally stored at the subscriber station; and
if the speech meaning cannot be decoded by a first word decoder located at the at the subscriber station in accordance with the small vocabulary, then transmitting the extracted speech features to a central processing station using a second word decoder located at the central processing station to decode the extracted speech features in accordance with a larger vocabulary.
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Abstract
A voice recognition system is disclosed wherein a feature extraction apparatus is located in a remote station. The feature extraction apparatus extracts features from an input speech frame and then provides the extracted features to a central processing station. In the central processing station, the features are provided to a word decoder which determines the syntax of the input speech frame.
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Citations
7 Claims
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1. A method for providing voice recognition in a wireless communication system, the method comprising the steps of:
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providing a speech signal spoken by a user to a feature extractor located at a subscriber station;
extracting a set of speech features from the speech signal in accordance with a predetermined feature extraction format;
determining a speech meaning from the extracted speech features in accordance with a small vocabulary that is locally stored at the subscriber station; and
if the speech meaning cannot be decoded by a first word decoder located at the at the subscriber station in accordance with the small vocabulary, then transmitting the extracted speech features to a central processing station using a second word decoder located at the central processing station to decode the extracted speech features in accordance with a larger vocabulary. - View Dependent Claims (2, 3, 4)
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5. A method for providing a distributed voice recognition system, the method comprising the steps of:
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processing a frame of speech samples at a subscriber station to determine acoustic features of the frame of speech samples;
using a first word decoder located at the subscriber station to decode the acoustic features, wherein the first word decoder uses a small vocabulary to decode the acoustic features;
transmitting the acoustic features from the subscriber station to a central processing station if the acoustic features cannot be decoded by the first word decoder;
receiving the acoustic features at the central processing station;
using a second word decoder located at the central processing station to decode the acoustic features, wherein the remote word decoder uses a larger vocabulary to decode the acoustic features; and
transmitting the decoded acoustic features from the central processing station to the subscriber station. - View Dependent Claims (6)
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7. A method for providing a distributed voice recognition system, the method comprising the steps of:
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extracting acoustic features of a frame of speech samples at a subscriber station;
decoding the acoustic features in accordance with a small vocabulary using a first word decoder located at the subscriber station;
transmitting the extracted acoustic features from the subscriber station to a central processing station if the extracted acoustic features cannot be decoded by the first word decoder;
receiving the extracted acoustic features at the central processing station; and
decoding the extracted acoustic features in accordance with a larger vocabulary using a second word decoder located at the central processing station, if the decoded acoustic features are associated with a local command signal, then transmitting the local command signal from the central processing station to the subscriber station.
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Specification