Noise that occurs when playing in play_hires.ino

If you play a chirp signal that transitions from 18 kHz to 48 kHz at a sampling rate of 96 kHz using a sprense, noise like the image will be generated.The part surrounded by green is the desired playback signal, but is there any other way to correct it?
The test is played from the earphone jack by connecting the official expansion board or B-stem PDA01 to the main board of the spresense.

spresense

2022-09-30 17:33

1 Answers

It is true that 96 kHz/24 bit has noise.
192kHz doesn't seem to have noise, and 16bit doesn't seem to have noise.

If you want to output up to 48 kHz, you can do 96 kHz sampling according to the theoretical value, but it'
It's hard to get the desired waveform, so why don't you output it at 192 kHz?

2022-09-30 17:33

If you have any answers or tips

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