Add: document about "query sound card number"
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README.md
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README.md
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@ -196,7 +196,22 @@ plughw:CARD=seeed8micvoicec,DEV=0
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In contrast to 6-Mics Circular Array Kit for Raspberry Pi,
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In contrast to 6-Mics Circular Array Kit for Raspberry Pi,
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the difference is only first 4 input channels are valid capture data.
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the difference is only first 4 input channels are valid capture data.
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### Usage:
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### Usage:
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```bash
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#Query sound card number
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# The sound card number used as arecord/aplay argument,
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# ( like '-D hw:N' and '-D plughw:N', where N is the number )
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# could be found by command:
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aplay -l
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#or
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arecord -l
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# Find the line in the command output which near below form:
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card 1: seeed2micvoicec [seeed-2mic-voicecard], device 0: ...
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# The number between first word `card` and char `:` is the Sound Card Number, here it's 1.
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```
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```bash
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```bash
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#for ReSpeaker 2-mic
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#for ReSpeaker 2-mic
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#It will capture sound an playback on hw:1
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#It will capture sound an playback on hw:1
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