US 11,984,107 B2
Audio signal processing method and system for echo suppression using an MMSE-LSA estimator
Abdel Yussef Hussenbocus, Heverlee (BE); Christophe Mansard, Brussels (BE); and Stijn Robben, Boutersem (BE)
Assigned to Analog Devices International Unlimited Company, Limerick (IE)
Filed by Analog Devices International Unlimited Company, Limerick (IE)
Filed on Jul. 13, 2022, as Appl. No. 17/863,939.
Prior Publication US 2024/0021184 A1, Jan. 18, 2024
Int. Cl. G10K 11/178 (2006.01); H04R 29/00 (2006.01)
CPC G10K 11/178 (2013.01) [H04R 29/00 (2013.01); G10K 2210/505 (2013.01)] 21 Claims
OG exemplary drawing
 
11. An audio system comprising at least an audio sensor and a speaker unit, wherein the speaker unit is configured to convert a speaker audio signal received as input into a speaker acoustic signal for a user of the audio system, wherein the audio sensor is configured to produce a sensor audio signal by measuring acoustic signals reaching the audio sensor, wherein said audio system further comprises a processing circuit configured to:
retrieve the speaker audio signal corresponding to the speaker acoustic signal output by the speaker unit while measuring the acoustic signals reaching the audio sensor to produce the sensor audio signal,
convert the speaker audio signal to frequency domain, thereby producing a speaker audio spectrum,
convert the sensor audio signal to frequency domain, thereby producing a sensor audio spectrum,
estimate, based on the speaker audio spectrum, an echo audio spectrum of an echo audio signal caused by the speaker acoustic signal in the sensor audio signal,
compute, based on the echo audio spectrum and the sensor audio spectrum, echo suppression gains to be applied to the sensor audio spectrum, by using a Minimum Mean Square Error-Log Spectral Amplitude, MMSE-LSA, estimator,
apply the echo suppression gains to the sensor audio spectrum.