Sorry, I'm coming into this late but .....
Dan Mills wrote:
> The gain control signal has energy right the way out
> to the band limit (and probably aliased around it),
> never mind what happens when that hits the multiplier!
You need a low pass filter on the control signal. It should
be somewhere well below 1kHz.
> Fixing this right means upsampling and adding a
> lowpass filter to the control loop, then downsampling
> again.
No it doesn't. You want to absolutely avoid fast changes in
the control signal because fast changes will modulate the
audio signal whcih is **not** desirable.
Erik
-- +-----------------------------------------------------------+ Erik de Castro Lopo +-----------------------------------------------------------+ "The reasonable man adapts himself to the world; the unreasonable one persists to adapt the world to himself. Therefore all progress depends on the unreasonable man." -- George Bernard Shaw (1856-1950)Received on Wed Oct 18 04:15:01 2006
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