My system`s main function is to sample audio datas,process,and play them back.The process core is a ST semi `s STM32F103RC processor,plus TI`s TLV320AIC23B audio codec.Of course audio preamps(op amp).The power supply is a LM2576.Now the problem is,it is hard to handle the hole noise level of this system.Even no process(the signl is digitaly bypass inside the STM32),it still has a noise level about 1mVrms.The noise is just like white noise,especially low frequncy band.The same situation has also been found in another system based on a TI`s TMS320C6720 DSP(they have the same function).Could you give me some idea to solve this problem? Buy the way,both of the two system has a small level of noise tone sounds like a 1Khz.Thank you very much.
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