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公开(公告)号：US20210136493A1
公开(公告)日：2021-05-06
申请号：US16479718
申请日：2018-02-08
摘要： 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.
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公开(公告)号：US10887712B2
公开(公告)日：2021-01-05
申请号：US16626596
申请日：2018-06-26
发明人： Kim Spetzler Berthelsen , Michael Kuntzman , Claus Furst , Sung Bok Lee , Mohammad Shajaan , Venkataraman Chandrasekaran
摘要： 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.
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公开(公告)号：US10165359B2
公开(公告)日：2018-12-25
申请号：US15892341
申请日：2018-02-08
IPC分类号： H04R3/00 , H04R19/04 , H04R1/08 , G10L21/0232 , G10L21/0216 , H03M7/30
摘要： The disclosure relates to a microphone assembly including a multibit analog-to-digital converter configured to generate N-bit samples representative of a microphone signal. The microphone assembly also includes a first digital-to-digital converter configured to generate a corresponding M-bit digital signal based on N-bit digital samples, wherein N and M are positive integers and N>M. The microphone assembly may include a data interface configured to repeatedly receive samples of the M-bit digital signal and write bits of the M-bit digital signal to a data frame.
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公开(公告)号：US20170061963A1
公开(公告)日：2017-03-02
申请号：US15259473
申请日：2016-09-08
发明人： Dibyendu Nandy , Yang Li , Ramanujapuram Raghuvir , Robert A. Popper , Andrzej Pawlowski , Kim Spetzler Berthelsen , Henrik Thomsen , Niel D. Warren , David P. Rossum
CPC分类号： G10L15/22 , G06F1/3206 , G10L15/30 , G10L25/48 , G10L25/78 , H04R3/00 , H04R3/005 , H04R19/04 , H04R2201/003
摘要： 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.
摘要翻译： 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。 数据流通过第二路径作为实时数据流连续发送，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。
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公开(公告)号：US09478234B1
公开(公告)日：2016-10-25
申请号：US14797310
申请日：2015-07-13
发明人： Dibyendu Nandy , Yang Li , Ramanujapuram Raghuvir , Robert A. Popper , Andrzej Pawlowski , Kim Spetzler Berthelsen , Henrik Thomsen , Niel D. Warren , David P. Rossum
CPC分类号： G10L15/22 , G06F1/3206 , G10L15/30 , G10L25/48 , G10L25/78 , H04R3/00 , H04R3/005 , H04R19/04 , H04R2201/003
摘要： 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.
摘要翻译： 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。 数据流通过第二路径作为实时数据流连续发送，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。
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公开(公告)号：US11323805B2
公开(公告)日：2022-05-03
申请号：US17130535
申请日：2020-12-22
发明人： Mohammad Shajaan , Claus Erdmann Fürst , Per Flemming Høvesten , Kim Spetzler Berthelsen , Henrik Thomsen
摘要： A microphone assembly includes a transducer element and a processing circuit. The processing circuit includes an analog-to-digital converter (ADC) configured to receive, sample and quantize a microphone signal generated by the transducer element to generate a corresponding digital microphone signal. The processing circuit includes a feedback path including a digital loop filter configured to receive and filter the digital microphone signal to provide a first digital feedback signal and a digital-to-analog converter (DAC) configured to convert the first digital feedback signal into a corresponding analog feedback signal. The processing circuit additionally includes a summing node at the transducer output configured to combine the microphone signal and the analog feedback signal.
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公开(公告)号：US10721557B2
公开(公告)日：2020-07-21
申请号：US16228580
申请日：2018-12-20
IPC分类号： H04R3/00 , H04R19/04 , H04R1/08 , G10L21/0232 , G10L21/0216 , H03M7/36 , H03M7/32
摘要： The disclosure relates to a microphone assembly including a multibit analog-to-digital converter configured to generate N-bit samples representative of a microphone signal. The microphone assembly also includes a first digital-to-digital converter configured to generate a corresponding M-bit digital signal based on N-bit digital samples, wherein N and M are positive integers and N>M. The microphone assembly may include a data interface configured to repeatedly receive samples of the M-bit digital signal and write bits of the M-bit digital signal to a data frame.
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公开(公告)号：US10904672B2
公开(公告)日：2021-01-26
申请号：US16375193
申请日：2019-04-04
发明人： Mohammad Shajaan , Claus Erdmann Fürst , Per Flemming Høvesten , Kim Spetzler Berthelsen , Henrik Thomsen
摘要： A microphone assembly includes an acoustic filter with a first highpass cut-off frequency. The microphone assembly additionally includes a forward signal path and a feedback signal path. The forward signal path is configured to amplify or buffer an electrical signal generated by a transducer in response to sound and to convert the electrical signal to a digital signal. The feedback signal path is configured to generate a digital control signal based on the digital signal and to generate and output a sequence of variable current pulses based on the digital control signal. The variable current pulses suppress frequencies of the electrical signal below a second highpass cut-off frequency, higher than the first highpass cut-off frequency.
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公开(公告)号：US10257616B2
公开(公告)日：2019-04-09
申请号：US15216928
申请日：2016-07-22
发明人： Mohammad Shajaan , Claus Erdmann Fürst , Per Flemming Høvesten , Kim Spetzler Berthelsen , Henrik Thomsen
摘要： 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.
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公开(公告)号：US20180315416A1
公开(公告)日：2018-11-01
申请号：US15770117
申请日：2016-10-21
IPC分类号： G10L15/02 , G10L25/51 , H04R19/04 , G10L25/21 , G10L25/18 , G10L15/00 , H04R3/04 , G10L25/78
CPC分类号： G10L15/08 , G10L25/51 , G10L2015/088 , H03H17/0269 , H04L25/49 , H04L29/06 , H04R3/04 , H04R17/02 , H04R29/004 , H04R2499/11
摘要： 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.
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