Telephone network apparatus and method using echo delay and attenuation
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United States of America Patent
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Jun 2, 1998
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app pub date -
Mar 17, 1995
filing date -
Mar 17, 1995
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Abstract
The present invention provides a telephone network apparatus for performing speech recognition services in a telephone system in substantially real time. The apparatus uses a telephone channel signal to determine the echo delay of a telephone channel and then uses this delay to configure an echo cancellation filter for use in performing speech recognition. Use of echo delay in configuring the filter allows the echo cancellation function to be done using much less computational time than would be needed without its use, thereby granting a speech recognition unit greater access to a resident microprocessor to perform its function in substantially real time.
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