Echo cancellation device and echo cancellation method
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsHiromasa OHASHI, Junji ARAKI
Life of this patent
Estimating the term…
Abstract
An echo canceller generates a microphone signal, updates an adaptive filter used for estimating an echo signal, generates a pseudo-echo signal based on an output signal and the adaptive filter, removes the pseudo-echo signal from the microphone signal and generates an echo-removed signal, determines whether a target speech signal is included in the echo-removed signal, adjusts a gain of the echo-removed signal based on a determination result, and generates the output signal based on the adjusted echo-removed signal.
Claims8
An echo canceller for removing an echo sound that is a sound output from a speaker, propagates through space and is input to a microphone, the echo canceller comprising:
- a microphone signal generation unit that generates a microphone signal based on a sound received from the microphone;
- an adaptive filter update unit that updates an adaptive filter used for estimating an echo signal that is a signal related to the echo sound;
- a pseudo-echo signal generation unit that generates a pseudo-echo signal based on an output signal that is a signal related to a sound output from the speaker and the adaptive filter;
- an echo signal removing unit that removes the pseudo-echo signal from the microphone signal and generates an echo-removed signal;
- a target speech detection unit that determines whether a target speech signal that is a signal different from the echo signal is included in the echo-removed signal;
- a gain adjustment unit that adjusts a gain of the echo-removed signal based on a determination result by the target speech detection unit;
- and
- an output signal generation unit that generates the output signal based on the echo-removed signal adjusted by the gain adjustment unit.
An echo cancellation method for removing an echo sound that is a sound output from a speaker, propagates through space and is input to a microphone, the method comprising:
- generating a microphone signal based on a sound received from the microphone;
- updating an adaptive filter used for estimating an echo signal that is a signal related to the echo sound;
- generating a pseudo-echo signal based on an output signal that is a signal related to a sound output from the speaker and the adaptive filter;
- removing the pseudo-echo signal from the microphone signal and generating an echo-removed signal;
- determining whether a target speech signal that is a signal different from the echo signal is included in the echo-removed signal;
- adjusting a gain of the echo-removed signal based on a determination result obtained during the determining;
- and
- generating the output signal based on the echo-removed signal adjusted during the adjusting.
Dependencies are inferred from the claim text.