A question about the I2S cycle.

[Ellison]

hi ,

I am working on I2S to collect audio, and I need 2 nrf52833 to realize the intercom function.
For these two nrf52833, the I2S clock is different. There are fast and slow. Is there any way to speed up or slow down his cycle without re-initialization, so that the two can be synchronized.

[Kenneth]

Let me look into this.

Kenneth

[Ellison]

ok,thank!

Ellison

[Kenneth]

For the nRF52-series, to overcome underflow/overflow audio buffers then interpolating/discarding samples would be the solution. Interpolating/discarding samples can introduce distortion in audio, but are depended on the clock offset between peers and buffer size.

The nRF53-series may be a better fit, since the nRF5340 has a dedicated audio clock. The MCK frequency can be adjusted on-the-fly for the nRF5340: 
https://infocenter.nordicsemi.com/topic/ps_nrf5340/i2s.html#concept_ezd_bqy_vr 

Best regards,
Kenneth