我一直在尝试使用以下USB音频卡：https://http2.mlstatic.com/tarjeta-de-sonido-usb-71-con-control-de-volumen-D_NQ_NP_904044-MCO31004989404_062019-F.webp作为声音输出和输入。
我遵循了本教程：https://www.raspberrypi-spy.co.uk/2019/06/using-a-usb-audio-device-with-the-raspberry-pi/，并且输出按预期工作，但是当我尝试在另一个插槽中使用3.5mm麦克风录制内容时，（https://www.importacioneswest.com/wp-content/uploads/2014/11/61jp2CwmoqL.SL1300-1024x1024.jpg）只会创建空白文件。 / p>
我还需要配置其他内容吗？
我使用以下命令进行记录：
arecord --device=hw:1,0 --format S16_LE --rate 44100 -c1 -V mono test.wav
以下是Pi确认的卡片：
0 [ALSA ]: bcm2835_alsa - bcm2835 ALSA
bcm2835 ALSA
1 [Device ]: USB-Audio - USB PnP Sound Device
C-Media Electronics Inc. USB PnP Sound Device at usb-3f980000.usb-1.4, full spe
捕获设备：
**** List of CAPTURE Hardware Devices ****
card 1: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
以及调音台信息：
Simple mixer control 'Speaker',0
Capabilities: pvolume pswitch pswitch-joined
Playback channels: Front Left - Front Right
Limits: Playback 0 - 151
Mono:
Front Left: Playback 64 [42%] [-16.38dB] [on]
Front Right: Playback 64 [42%] [-16.38dB] [on]
Simple mixer control 'Mic',0
Capabilities: pvolume pvolume-joined cvolume cvolume-joined pswitch pswitch-joined cswitch cswitch-joined
Playback channels: Mono
Capture channels: Mono
Limits: Playback 0 - 127 Capture 0 - 16
Mono: Playback 75 [59%] [14.06dB] [off] Capture 16 [100%] [23.81dB] [on]
Simple mixer control 'Auto Gain Control',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]