将数字麦克风连接到编***是什么？

通常，数字麦克风在编解码器提供合适的时钟并因此接受麦克风的数字数据的环境中操作。另外，麦克风可以在单模式或立体声配置中使用。当用于立体声配置时，可以缩短几个麦克风的数据输出。关于立体声配置，所涉及的数字麦克风的LR引脚必须分别设置为Vdd和gnd。此设置将产生由有效数据和Hi-Z连续组成的输出。选择模式后，编解码器的目标是对来自传感器的数据进行采样。必须根据使用的模式设置编解码器的采样率。对于立体声配置，如果编解码器只能在咔嗒声的上升沿或下降沿采样，则编解码器的采样率必须相对于麦克风时钟加倍。最后，编解码器必须包括抽取算法，以便解码来自麦克风的PDM信号。
有关ST PDM库的详细信息，请参见ST网站上的AN3998：
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/DM00040808.pdf
该库已发布到开放市场，因此可以开发基于STM32的音频应用程序，利用ST数字MEMS麦克风，可通过以下链接获得：
http://www.st.com/stonline/stappl/resourceSelector/app?page=resourceSelector&doctype=FIRMWARE&SubClassID=1521
亚历山德罗



以下为原文







Commonly, the digital microphones operate in an environment where a codec provides the suitable clock and consequently accepts the digital data of the microphone. Additionally, the microphone can be used in single mode or in a stereo configuration. When used in stereo configuration the data output of the couple of microphone can be shorted. Concerning the stereo configuration, the LR pins of the involved digital microphones must be respectively set to Vdd and gnd. This setting will produce an output composed by the succession of valid data and Hi-Z. Once the mode is chosen, the goal of the codec is to sample the data coming from the sensor. The sampling rate of the codec must be set according to the used mode. For a stereo configuration, in case of the codec is able to sample only on rising or falling edge of the click, the sampling rate of the codec must be doubled with respect to microphone clock. Finally the codec must include a decimation algorithm in order to decode the PDM signal coming from the microphone.

Details about the ST PDM library can be found on the AN3998, available on ST web:

http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/DM00040808.pdf

The library is released to the open market thus enabling development of STM32-based audio application exploiting ST digital MEMS Microphones, it is available at the following link:

http://www.st.com/stonline/stappl/resourceSelector/app?page=resourceSelector&doctype=FIRMWARE&SubClassID=1521
Alessandro