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.