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STM32F4-DISC1 emits audio noise

Question asked by Stanislav Silnicki on Nov 5, 2016
Latest reply on Nov 7, 2016 by Stanislav Silnicki
Hi Everybody!
I've successfully implemented USB Audio device, utilising onboard cs43l22 DAC and it works well, except one annoying thing: it emits periodic noise in analog output, mixed to normal sound. I noticed, that it is rigidly bound to the moment when
HAL_I2S_Transmit_DMA is called to send new data to DAC. I have captured the sound by Audacity and here how it looks like. Can anyone suggest the nature of that noise and how it could be fixed?

Thank you,