Apparatus that detects voice energy during prompting by a voice recognition system
First Claim
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1. In a speech recognition system, the improvement comprising apparatus for detecting the presence of user speech on a telephone line input to the system concurrent with the emission of a prompt by said system, comprising:
- means for forming a first measurement of said input over at least a first interval by measuring said prompt and by measuring said input;
means for forming an attenuation parameter based on said first measurement;
means for forming a predicted replica of a prompt echo residue of said prompt, based on said prompt, said input, and said attenuation parameter;
means for comparing said input over intervals subsequent to said first interval with said attenuation parameter and said prompt and providing a prompt-termination signal when said input exceeds said predicted replica by a pre-defined margin; and
means responsive to said prompt-termination signal to terminate said prompt.
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Abstract
A barge-in detector for use in connection with a speech recognition system forms a prompt replica for use in detecting the presence or absence of user input to the system. The replica is indicative of the prompt energy applied to an input of the system. The detector detects the application of user input to the system, even if concurrent with a prompt, and enables the system to quickly respond to the user input.
57 Citations
7 Claims
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1. In a speech recognition system, the improvement comprising apparatus for detecting the presence of user speech on a telephone line input to the system concurrent with the emission of a prompt by said system, comprising:
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means for forming a first measurement of said input over at least a first interval by measuring said prompt and by measuring said input; means for forming an attenuation parameter based on said first measurement; means for forming a predicted replica of a prompt echo residue of said prompt, based on said prompt, said input, and said attenuation parameter; means for comparing said input over intervals subsequent to said first interval with said attenuation parameter and said prompt and providing a prompt-termination signal when said input exceeds said predicted replica by a pre-defined margin; and means responsive to said prompt-termination signal to terminate said prompt. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification