公开(公告)号：WO2018018002A1

公开(公告)日：2018-01-25

申请号：PCT/US2017/043372

申请日：2017-07-21

Applicant: KNOWLES ELECTRONICS, LLC

Inventor： SHAJAAN, Mohammad ,  FÜRST, Claus Erdmann ,  HØVESTEN, Per Flemming ,  BERTHELSEN, Kim Spetzler ,  THOMSEN, Henrik

IPC: H04R19/00 ,  H04R3/06

CPC classification number: H04R19/04 ,  G06F3/162 ,  H04R3/02 ,  H04R3/06 ,  H04R19/005 ,  H04R2201/003

Abstract: A microphone assembly includes an acoustic transducer element configured to convert sound into a microphone signal in accordance with a transducer frequency response including a first highpass cut-off frequency. The microphone assembly additionally includes a processing circuit including a signal amplification path configured to receive, sample and digitize the microphone signal to provide a digital microphone signal. A frequency response of the signal amplification path includes a second highpass cut-off frequency which is higher than the first highpass cut-off frequency of the acoustic transducer element.

Abstract translation: 麦克风组件包括声学换能器元件，该声学换能器元件被配置为根据包括第一高通截止频率的换能器频率响应将声音转换成麦克风信号。 麦克风组件还包括处理电路，该处理电路包括被配置为接收，采样和数字化麦克风信号以提供数字麦克风信号的信号放大路径。 信号放大路径的频率响应包括比声学换能器元件的第一高通截止频率高的第二高通截止频率。

公开(公告)号：WO2018152003A1

公开(公告)日：2018-08-23

申请号：PCT/US2018/017458

申请日：2018-02-08

Applicant: KNOWLES ELECTRONICS, LLC

Inventor： BERTHELSEN, Kim Spetzler ,  SHAJAAN, Mohammad ,  FURST, Claus

IPC: H03G5/16 ,  H04R3/02

Abstract: A system and method in an audio signal electrical circuit including a feedback loop with a digital filter coupled to a current digital to analog converter (IDAC) includes providing an output signal from the IDAC to analog elements of the audio signal electrical circuit, the output signal from the IDAC based upon a reference signal input to the IDAC when an output of the digital filter is not input to the IDAC. The system and method also include comparing an output signal of the audio signal electrical circuit to a reference, and calibrating the audio signal electrical circuit to correspond the output signal of the audio signal electrical circuit to the reference. Calibration of the audio signal electrical circuit enables more precise control of a cut-off frequency of a microphone signal when the output of the digital filter is input to the IDAC.

公开(公告)号：WO2019005885A1

公开(公告)日：2019-01-03

申请号：PCT/US2018/039617

申请日：2018-06-26

Applicant: KNOWLES ELECTRONICS, LLC

Inventor： BERTHELSEN, Kim Spetzler ,  KUNTZMAN, Michael ,  FURST, Claus ,  LEE, Sung Bok ,  SHAJAAN, Mohammad ,  CHANDRASEKARAN, Venkataraman

IPC: G10L19/26

Abstract: A microphone assembly includes an acoustic transducer and an audio signal electrical circuit configured to receive an output signal from the acoustic transducer. The output signal includes an audio signal component and a tracking signal component. The audio signal component is representative of an acoustic signal detected by the acoustic transducer and the tracking signal component is based on an input tracking signal applied to the acoustic transducer. The audio signal electrical circuit includes an analog to digital converter configured to convert the output signal into a digital signal, an extraction circuit configured to separate the tracking signal component and the audio signal component from the digital signal, an envelope estimation circuit configured to estimate a tracking signal envelope from the tracking signal component, and a signal correction circuit configured to reduce distortion in the audio signal component using the tracking signal envelope.

公开(公告)号：WO2017011403A1

公开(公告)日：2017-01-19

申请号：PCT/US2016/041787

申请日：2016-07-11

Applicant: KNOWLES ELECTRONICS, LLC

Inventor： NANDY, Dibyendu ,  LI, Yang ,  RAGHUVIR, Ramanujapuram ,  POPPER, Robert A. ,  PAWLOWSKI, Andrzej ,  BERTHELSEN, Kim Spetzler ,  THOMSEN, Henrik ,  WARREN, Niel, D. ,  ROSSUM, David, P.

IPC: G10L21/0224 ,  G10L21/02

CPC classification number: G10L15/22 ,  G06F1/3206 ,  G10L15/30 ,  G10L25/48 ,  G10L25/78 ,  H04R3/00 ,  H04R3/005 ,  H04R19/04 ,  H04R2201/003

Abstract: At a microphone, voice activity is detected in a data stream while simultaneously buffering audio data from the data stream to create buffered data. A signal is sent to a host indicating the positive detection of voice activity in the data stream. When an external clock signal is received from the host, the internal operation of the microphone is synchronized with the external clock signal. Buffered data stream is selectively sent through a first path, the first path including a buffer having a buffer delay time representing the time the first data stream takes to move through the buffer. The data stream is continuously sent through a second path as a real time data stream, the second path not including the buffer, the real time data stream beginning with the extended buffer data at a given instant in time. The buffered data stream and the real time data stream are multiplexed onto a single data line and transmitting the multiplexed data stream to the host.

Abstract translation: 在麦克风上，在数据流中检测到语音活动，同时从数据流缓冲音频数据以创建缓冲数据。 信号被发送到主机，指示数据流中的语音活动的肯定检测。 当从主机接收到外部时钟信号时，麦克风的内部操作与外部时钟信号同步。 缓冲数据流被选择性地通过第一路径发送，第一路径包括缓冲器，缓冲器具有表示第一数据流在缓冲器中移动的时间的缓冲延迟时间。 数据流通过作为实时数据流的第二路径连续发送，第二路径不包括缓冲器，在给定时刻从扩展缓冲器数据开始的实时数据流。 将缓冲的数据流和实时数据流复用到单个数据线上，并将多路复用的数据流发送到主机。

公开(公告)号：WO2017070535A1

公开(公告)日：2017-04-27

申请号：PCT/US2016/058212

申请日：2016-10-21

Applicant: KNOWLES ELECTRONICS, LLC

Inventor： BERTHELSEN, Kim Spetzler ,  NANDY, Dibyendu ,  THOMPSEN, Henrik ,  PILLI, Sridhar

IPC: G10L25/78 ,  G10L25/84 ,  G10L25/93 ,  H04R17/02 ,  H04R11/04 ,  H04R3/04 ,  H04L25/49 ,  H04L29/06

CPC classification number: G10L15/08 ,  G10L25/51 ,  G10L2015/088 ,  H03H17/0269 ,  H04L25/49 ,  H04L29/06 ,  H04R3/04 ,  H04R17/02 ,  H04R29/004 ,  H04R2499/11

Abstract: At a configurable filter bank, commands or command signals are received from an external processing device. The commands or command signals are effective to configure and connect selective ones of the plurality of elements in the filter bank. An acoustic signal is received from a transducer. The acoustic signal is converted to a PDM signal and the PDM signal is converted to a PCM signal.

Abstract translation: 在可配置的滤波器组处，从外部处理设备接收命令或命令信号。 命令或命令信号有效地配置和连接滤波器组中的多个元件中的选定元件。 从换能器接收声信号。 声音信号被转换成PDM信号，PDM信号被转换成PCM信号。