公开(公告)号：US20190222699A1

公开(公告)日：2019-07-18

申请号：US16362156

申请日：2019-03-22

Applicant: Sennheiser Communications A/S

Inventor： Stig PETRI ,  Svend FELDT

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

CPC classification number: H04M9/082 ,  G06F17/142 ,  G10L21/0208 ,  G10L21/0232 ,  G10L2021/02082 ,  H03H21/0027 ,  H04B3/23 ,  H04R1/1091 ,  H04R3/02 ,  H04R25/453

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.

公开(公告)号：US20150011266A1

公开(公告)日：2015-01-08

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

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.

Abstract translation: 该应用涉及通信设备，例如， 扬声器电话，包括麦克风信号路径MSP和扬声器信号路径SSP，所述麦克风信号路径包括麦克风单元，MSP滤波器和发射机单元，所述麦克风单元，MSP滤波器和发射机单元可操作地彼此连接并且被配置为发送经处理的信号 从麦克风拾取的输入声音，扬声器信号路径包括接收器单元，SSP滤波器和扬声器单元，其可操作地彼此连接并且被配置为提供源自由接收器单元接收的信号的声音信号 。 通信设备包括用于基于一个或多个控制输入信号动态地控制MSP和SSP滤波器的滤波特性的控制单元。 这具有提供用于减少通信设备中的回波的简单且灵活的方案，同时确保发送信号中可接受的声音质量。

公开(公告)号：US20180027125A1

公开(公告)日：2018-01-25

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

CPC classification number: H04M9/082 ,  G06F17/142 ,  G10L21/0208 ,  G10L21/0232 ,  G10L2021/02082 ,  H03H21/0027 ,  H04B3/23 ,  H04R1/1091 ,  H04R3/02 ,  H04R25/453

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.