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AnalyserNode.minDecibels

The minDecibels property of the AnalyserNode interface Is a double value representing the minimum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte/float values — basically, this specifies the minimum value for the range of results when using getFloatFrequencyData() or getByteFrequencyData().
AnalyserNode API minDecibels Property Reference Référence Web Audio API