IoT 硬件：Raspberry Pi ReSpeaker 智能语音识别双麦克风阵列
ReSpeaker 2-Mics Pi HAT是专为AI和语音应用设计的Raspberry Pi双麦克风扩展板。 这意味着您可以构建一个集成Amazona语音服务等的功能更强大，更灵活的语音产品。
该板是基于WM8960开发的低功耗立体声编解码器。 电路板两侧有两个麦克风采集声音，还提供3个APA102 RGB LED，1个用户按钮和2个板载Grove接口，用于扩展应用程序。 此外，3.5mm音频插孔或JST 2.0扬声器输出均可用于音频输出。
- aplay
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 2: seeed2micvoicec [seeed-2mic-voicecard], device 0: bcm2835-i2s-wm8960-hifi wm8960-hifi-0 [bcm2835-i2s-wm8960-hifi wm8960-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0