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Reducing the CPU Clock Speed introducing a much higher noise level when playing audio by I2S on stm32f405

Question asked by zhang.biao.001 on May 26, 2015
Latest reply on May 28, 2015 by hwasti

We have a solution, which reading audio file from SDCard and playing by I2S. It works ok when the CPU Clock Speed is >= 84Mhz. To reducing the Power Consumption, we have to reducing the CPU Clock Speed to 24MHz, then there is a very high noise level in the speaker. My question are

1. Is the stm32f405 capable of playing audio by I2S when the CPU Clock Speed is 24MHz? Has anyone ever done such test?

2. How to debug and locating such kind of noise level issue?