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Sigma DSP delay 90 and decay

Question asked by lindy on Nov 25, 2011
Latest reply on Dec 14, 2011 by BrettG

I have two questions :

1、in ADAU1761 , the frequence of the input signal is 50hz-15khz, How to implement the phase shift 90 degree

2、How to implement that when the input signal under - 60DB, the volume decay to the minimise and the decay time which about 10 sec can control