Methods for suppressing residual echo

Methods for suppressing residual echo

A system configured to improve speech quality by performing residual echo suppression (RES). The system may detect when double-talk conditions are present in individual frequency bands during a voice conversation and may determine gain values for the individual frequency bands. The system may determ...

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Hauptverfasser: Murgia, Carlo, Chu, Wai Chung, Kim, Hyeong Cheol
Format: Patent
Sprache:eng
Schlagworte:
ACOUSTICS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MUSICAL INSTRUMENTS
PHYSICS
SPEECH ANALYSIS OR SYNTHESIS
SPEECH OR AUDIO CODING OR DECODING
SPEECH OR VOICE PROCESSING
SPEECH RECOGNITION
TRANSMISSION
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creator Murgia, Carlo
Chu, Wai Chung
Kim, Hyeong Cheol
description A system configured to improve speech quality by performing residual echo suppression (RES). The system may detect when double-talk conditions are present in individual frequency bands during a voice conversation and may determine gain values for the individual frequency bands. The system may determine whether double-talk conditions are present based on a normalized cross power spectral density function in a frequency domain. If double-talk conditions are present in a frequency band or far end energy is low, the system may determine a gain value that passes audio data in the frequency band, whereas if double-talk conditions are not present, the system may determine a gain value that attenuates audio data in the frequency band. The system may determine binary gain values using a decision threshold value or continuous gain values using a mapping function. The system may control an amount of suppression by selecting different mapping functions and/or parameters.
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subjects ACOUSTICS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MUSICAL INSTRUMENTS
PHYSICS
SPEECH ANALYSIS OR SYNTHESIS
SPEECH OR AUDIO CODING OR DECODING
SPEECH OR VOICE PROCESSING
SPEECH RECOGNITION
TRANSMISSION
title Methods for suppressing residual echo
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