公开(公告)号：US09819805B2

公开(公告)日：2017-11-14

申请号：US14323577

申请日：2014-07-03

Applicant: Sennheiser Communications A/S

Inventor： Svend Feldt ,  Adam Dyrby ,  Stig Petri

IPC: H04M9/08 ,  H04B3/21

CPC classification number: H04M9/082 ,  H04B3/21 ,  H04M9/087

Abstract: The application relates to a communication device, e.g. a speakerphone, comprising a microphone signal path, MSP, and a loudspeaker signal path, SSP, the microphone signal path comprising a microphone unit, an MSP-filter, and a transmitter unit operationally connected to each other and configured to transmit a processed signal originating from an input sound picked up by the microphone, the loudspeaker signal path comprising a receiver unit, an SSP-filter, and a loudspeaker unit operationally connected to each other and configured to provide an acoustic sound signal originating from a signal received by the receiver unit. The communication device comprises a control unit for dynamically controlling the filtering characteristics of the MSP and SSP-filters based on one or more control input signals. This has the advantage of providing a simple and flexible scheme for decreasing echo in a communication device, while ensuring an acceptable sound quality in the transmitted signal.

公开(公告)号：US10291784B2

公开(公告)日：2019-05-14

申请号：US15655295

申请日：2017-07-20

Applicant: Sennheiser Communications A/S

Inventor： Stig Petri ,  Svend Feldt

IPC: H04M9/08 ,  G06F17/14 ,  H03H21/00 ,  H04B3/23 ,  H04R3/02 ,  G10L21/0208 ,  G10L21/0232

Abstract: The invention relates to an adaptive filter unit, in particular for being used as an echo canceller, comprising a first filter input, configured to receive a first electric audio signal, indicative of a first audio signal A(t), a second filter input, configured to receive a second electric audio signal, indicative of a second audio signal B(t), a processor and a filter output. The processor is configured to calculate and provide audio estimation data X(fn, A(t1, . . . , tM(fn))) in the frequency domain; to calculate a transformed second audio signal Y(fn, B(t)), formed by a transformation of the second audio signal B(t) into the frequency domain; and to calculate a filtered audio signal by subtracting delayed audio estimation data from the transformed second audio signal, wherein the delayed audio estimation data is provided by a memory unit of the adaptive filter unit, which is arranged to provide a data exchange with the processor, and wherein the delayed audio estimation data comprises a frequency dependent time delay compared to the transformed second audio signal.