EFFECTIVE ATTENUATION OF LEADING ECHO SIGNALS IN DIGITAL AUDIO SIGNAL Russian patent published in 2017 - IPC G10L21/364 G10L19/26 G10L19/03 G10L21/02 

FIELD: radio engineering.

SUBSTANCE: invention relates to means of attenuation of leading echo signals in a digital audio signal. Attenuated are leading echo signals in a digital audio signal obtained by encoding by means of conversion. In the decoded signal a position of attack is detected. Determined is a zone of the leading echo signal preceding the position of attack detected in the decoded signal. Attenuation coefficients are calculated for each subunit of the zone of the leading echo signal depending on at least the frame, in which the attack was detected, and on the previous frame. Performed is the leading echo signal attenuation in subunits of the zone of the leading echo signal with the help of appropriate attenuation coefficients. Method of attenuating a leading echo signal additionally includes the step of using adaptive filtration to provide a spectral shape for the zone of the leading echo signal on the current frame prior to the detected position of attack.

EFFECT: technical result is the possibility of attenuation of high frequencies and parasitic leading echo signals when decoding without transmitting by the encoder any auxiliary information.

13 cl, 12 dwg