Record in mono (1 channel)

[pilinux]

I need to record in mono with 7 pdm mic array.

arecord -D plughw:1,0 -f S16_LE -c1 -r 16000 -v mono test1.wav It does not show any error but it creates a file without any audio (only noise).

I tested the same command for stereo and it worked perfectly. arecord -D plughw:1,0 -f S16_LE -c2 -r 16000 -v stereo test2.wav

Any idea how I can record in mono?

Thank you.

[KillingJacky]

Where do you plug the mic array to? ReSpeaker Core or PC?

[pilinux]

Ok here is the latest update.

I first tested with Raspberry Pi 3B (Jessie lite OS). At S16_LE (1 channel) there was no voice but only noise. I tried with Stretch image and same result.

Later, I tried with PC (ubuntu 16.04) and it worked. But there were noise at all configurations:

• S24_3LE (2 channels)
• S16_LE (2 channels)
• S16_3LE (1 channel) -> with more than enough noise

Only on windows with audacity at default config [ S24_3LE (2 channels) ], the recording was clear.

[xyu6]

Hi Dear Customer, i first use get device script to get the respeaker mic array index. then i modify the index and change channel to 1 in record script. I got the mono wav and i use the audacity to play and it works well. Bill

[pilinux]

Thank you a lot xyu6. It solved the issue 👍