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公开(公告)号：US09407224B2
公开(公告)日：2016-08-02
申请号：US14311086
申请日：2014-06-20
Applicant: STMicroelectronics International N.V.
Inventor： Carlo Pinna , Alessandro Mecchia , Paolo Pesenti
Abstract: The present disclosure refers to a digital microphone device providing a single-bit Pulse Density Modulation PDM output signal. The digital microphone comprises a microphone, arranged to convert an acoustic input signal into an analog electrical signal, and a preamplifier, having a variable gain, arranged to receive the analog electrical signal and to provide an amplified analog electrical signal, depending on the variable gain. The variable gain depends on a gain control signal. The digital microphone further comprises an Analog-to-Digital Converter block, arranged to receive the amplified analog electrical signal and to convert it into a respective digital signal; and a compensation block, arranged to receive the digital signal and to perform a digital operation on such digital signal, on the basis of a compensation signal, to generate a compensated signal. Furthermore, the digital microphone comprises an Automatic Gain Controller block 25, arranged to detect the digital signal and to generate said gain control signal, on the basis of the detected digital signal. The Automatic Gain Controller block is further arranged to generate the compensation signal, on the basis of the control signal, and to provide the compensation signal to the compensation block, to compensate a variation of the digital signal resulting from the variable gain of the preamplifier. Finally, the digital microphone device comprises a conversion block, arranged to receive the compensated signal and to convert it into the single-bit PDM output signal.
Abstract translation: 本公开涉及提供单位脉冲密度调制PDM输出信号的数字麦克风装置。 数字麦克风包括麦克风，其布置成将声输入信号转换为模拟电信号，以及具有可变增益的前置放大器，其布置成接收模拟电信号并根据可变增益提供放大的模拟电信号 。 可变增益取决于增益控制信号。 数字麦克风还包括模数转换器模块，被布置为接收放大的模拟电信号并将其转换成相应的数字信号; 以及补偿块，被布置成基于补偿信号接收数字信号并对这种数字信号执行数字操作，以产生补偿信号。 此外，数字麦克风包括自动增益控制器块25，其被布置为基于检测到的数字信号来检测数字信号并产生所述增益控制信号。 自动增益控制器块还被布置成基于控制信号产生补偿信号，并且向补偿块提供补偿信号，以补偿由前置放大器的可变增益引起的数字信号的变化。 最后，数字麦克风装置包括转换块，被布置成接收经补偿的信号并将其转换成单位PDM输出信号。
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公开(公告)号：US20140334643A1
公开(公告)日：2014-11-13
申请号：US14311086
申请日：2014-06-20
Applicant: STMicroelectronics International N.V.
Inventor： Carlo Pinna , Alessandro Mecchia , Paolo Pesenti
IPC: H03G3/20
Abstract: The present disclosure refers to a digital microphone device providing a single-bit Pulse Density Modulation PDM output signal. The digital microphone comprises a microphone, arranged to convert an acoustic input signal into an analog electrical signal, and a preamplifier, having a variable gain, arranged to receive the analog electrical signal and to provide an amplified analog electrical signal, depending on the variable gain. The variable gain depends on a gain control signal. The digital microphone further comprises an Analog-to-Digital Converter block, arranged to receive the amplified analog electrical signal and to convert it into a respective digital signal; and a compensation block, arranged to receive the digital signal and to perform a digital operation on such digital signal, on the basis of a compensation signal, to generate a compensated signal. Furthermore, the digital microphone comprises an Automatic Gain Controller block 25, arranged to detect the digital signal and to generate said gain control signal, on the basis of the detected digital signal. The Automatic Gain Controller block is further arranged to generate the compensation signal, on the basis of the control signal, and to provide the compensation signal to the compensation block, to compensate a variation of the digital signal resulting from the variable gain of the preamplifier. Finally, the digital microphone device comprises a conversion block, arranged to receive the compensated signal and to convert it into the single-bit PDM output signal.
Abstract translation: 本公开涉及提供单位脉冲密度调制PDM输出信号的数字麦克风装置。 数字麦克风包括麦克风，其布置成将声输入信号转换为模拟电信号，以及具有可变增益的前置放大器，其布置成接收模拟电信号并根据可变增益提供放大的模拟电信号 。 可变增益取决于增益控制信号。 数字麦克风还包括模数转换器模块，被布置为接收放大的模拟电信号并将其转换成相应的数字信号; 以及补偿块，被布置成基于补偿信号接收数字信号并对这种数字信号执行数字操作，以产生补偿信号。 此外，数字麦克风包括自动增益控制器块25，其被布置为基于检测到的数字信号来检测数字信号并产生所述增益控制信号。 自动增益控制器块还被布置成基于控制信号产生补偿信号，并且向补偿块提供补偿信号，以补偿由前置放大器的可变增益引起的数字信号的变化。 最后，数字麦克风装置包括转换块，被布置成接收经补偿的信号并将其转换成单位PDM输出信号。
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