https://devzone.nordicsemi.com/f/nordic-q-a/25468/about-the-i2s-communication-with-nrf52832the signal flow is as follow: TLV320AIC23B(as ADC)——》nRF52832（TX）——》nRF52832（Rx）——TLV320AIC23B（as DAC） TLV320 works in master mode and nRF52832 works in slave mode. 48kHz sampling rate and 16bits word length. they both are set to I2S mode. I set twoen-USTelligent Community 13Tue, 26 Sep 2017 12:47:06 GMThttps://devzone.nordicsemi.com/thread/100369?ContentTypeID=1Tue, 26 Sep 2017 12:47:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2601dde4-6d92-4594-9d75-8a4928b8de93MartinBL<ol> <li>So you transfer 200 of the original 1600 samples via BLE (or some radio protocol) and then use I2S and the TLV320AIC23B to generate the output shown in the image?</li> <li>Have you compared the original and the output sample values?</li> <li>Are you doing any filtering?</li> <li>Could there be some data outside of your buffer that somehow makes its way to the output?</li> <li>What do you mean by i2s &quot;date&quot;?</li> </ol> <p>It is pretty peculiar how the spikes seem to point up or downwards depending on where the output is in the cycle.</p><div style="clear:both;"></div>