Nuance Communications, Inc.

Harman Becker Automotive Systems Gmbh

Martin Rössler

Markus Buck

Gerhard Uwe Schmidt

Tim Haulick

Mohamed Krini

Walter Schnug

Gerhard Schmidt

An echo reduction system includes a signal analysis filter that converts an input into sub-band signals. A signal down-sampling circuit down-samples the sub-band signals at a first down-sampling rate. An echo analysis filter converts a loudspeaker signal into echo sub-band signal that are further processed by an echo down-sampling circuit. The circuit down-samples the echo sub-band signals at a second down-sampling rate to generate down-sampled echo sub-band signals. An echo compensation filter folds the down-sampled echo sub-band signals with an estimated impulse response of a loudspeaker-room-input system. A second echo down-sampling circuit down-samples the folded down-sampled echo sub-band signals at a third down-sampling rate to generate estimated echo sub-band signals. The first down-sampling rate is equal to the product of the second and third down-sampling rates.

Low complexity echo compensation system

Growing community of inventors

Ulm, Germany

Martin Rössler