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)
