Voltage controlled gain
Hey there,
Currently exploring a new architecture to move our patented surround sound algorithm to - am playing with the ADAU1467 evaluation board and the SigmaStudio.
One building block i can't find is a way to multiply an audio signal with a varying dc value derived from other processing. There is gain control but it's a fixed-value box, and there is a multiplier but it seems to require analog input - at least when i try to use a probe to multiply the stimulus with a DC input block, it does nothing or does not behave as expected.
Is there no multiplier that can be connected to an external variable dc value?
Cheers
`David
Audio Signal Processors
adau1467
SigmaDSP Audio Processors
Hello David,
SigmaStudio's Stimulus/Probe functionality is very useful for monitoring filter responses, but it does have some limitations. One of them is that multiplier cells are not evaluated.
Forum member KJBob made a wonderful post outlining the capabilities and limitations of the Stimulus/Probe blocks. I highly recommend you take a look:
https://ez.analog.com/dsp/sigmadsp/w/documents/14469/stimulus-probe-capability-and-limitations
Rest assured that you can use the ADAU1467 to multiply an audio signal by a DC source. Here is a schematic showing this in action. Note that the level meter on the right is 6dB higher than the one on the left, which is what we expect from a gain of 2.
Joshua
Much obliged.
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