公开(公告)号：US20150078569A1

公开(公告)日：2015-03-19

申请号：US14551832

申请日：2014-11-24

Applicant: Wolfson Microelectronics Ltd.

Inventor： Anthony J. Magrath ,  Richard Clemow

IPC: H04R3/00

CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3051 ,  H04R3/002

Abstract: A noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a second sample rate lower than the first sample rate; and a processor. The processor comprises: an emulation of the digital filter, connected to receive the decimated signal and to generate an emulated filter output; and a control circuit, for generating a control signal on the basis of the emulated filter output. The control signal is applied to the digital filter to control a filter characteristic thereof.

Abstract translation: 一种噪声消除系统，包括：数字信号的输入端，所述数字信号具有第一采样率; 数字滤波器，连接到输入端以接收数字信号; 抽头，连接到输入端以接收数字信号并以低于第一采样率的第二采样率产生抽取信号; 和处理器。 处理器包括：数字滤波器的仿真，连接以接收抽取信号并产生仿真滤波器输出; 以及控制电路，用于根据仿真的滤波器输出产生控制信号。 控制信号被施加到数字滤波器以控制其滤波器特性。

公开(公告)号：US09654871B2

公开(公告)日：2017-05-16

申请号：US14551832

申请日：2014-11-24

Applicant: Wolfson Microelectronics Ltd.

Inventor： Anthony J. Magrath ,  Richard Clemow

IPC: G10K11/16 ,  H04R3/00 ,  G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3051 ,  H04R3/002

Abstract: A noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a second sample rate lower than the first sample rate; and a processor. The processor comprises: an emulation of the digital filter, connected to receive the decimated signal and to generate an emulated filter output; and a control circuit, for generating a control signal on the basis of the emulated filter output. The control signal is applied to the digital filter to control a filter characteristic thereof.