嵌入式软件中如何验证麦克风的好坏?

# arecord -l 
**** List of CAPTURE Hardware Devices ****
card 0: AMLAUGESOUND [AML-AUGESOUND], device 0: TDM-A-dummy multicodec-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: AMLAUGESOUND [AML-AUGESOUND], device 1: TDM-B-dummy multicodec-1 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: AMLAUGESOUND [AML-AUGESOUND], device 3: PDM-dummy dummy-3 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7

 arecord -Dhw:0,3 -c 8 -r 16000 -f S16_LE /tmp/xxx.wav
 
-D, --device=NAME       select PCM by name　这里选择声卡0，设备3进行录音
-c, --channels=#        channels  4个麦克风/８通道
-f, --format=FORMAT     sample format (case insensitive)
-r, --rate=#            sample rate