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Thread: WM8731 codec whistle noise

  1. #1

    WM8731 codec whistle noise

    I am using a WM8731 and getting a whistle noise with fundamental around 2khz plus overtones. If I run the same board and code with a AK4556, no noise. Has anyone experienced this sort of problem?

  2. #2
    Senior Member Blackaddr's Avatar
    Join Date
    Mar 2017
    Try turning off the CODEC's HPF. A number of codec have dynamic HPF that attempt to to remove the DC offset but the that that the filter is not static results in noise artefacts. The SGTL5000 does the exact same thing so I'm speculating the manufacturers put that in their for non-critical listening applications like frequency (note) detection, spectral analysis, guitar tuners, etc.

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