Bug in Voltage Controlled (Fractional) Delay Block???

I'm seeing some unexpected behavior with the voltage-controlled fractional delay block in SigmaStudio. The processor I'm using is the ADAU1466 with a sample rate of 48kHz. The maximum delay in the block is 36000 samples (750ms at 48kHz).

When setting the input voltage to 0V using a DC source, I'm seeing a delay of roughly 615ms (should be 0ms). When setting the input voltage to 0.0625V (1/16V step size), I'm seeing a delay of roughly 662ms (should be 46.875ms) . Larger step sizes produce the expected delay. For example, 0.125V input produces 93.75ms delay, 0.250V input produces 187.5ms delay and so forth.

Can anyone else confirm this?

Thanks,
Larry Y.

Parents Reply Children