--- Erik de Castro Lopo <[EMAIL PROTECTED]> wrote: > You need a low pass filter on the control signal. It > should > be somewhere well below 1kHz.
Agreed that you need the filter, but a 'brick wall' at 1Khz means that anything faster then 50ms or so as an attack time (and there are legit uses for such), will itself overshoot horrribly due to the gibb effect of bandlimiting the control signal. Resampling: > 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. So, how do you implement a fast limiter if the fastest time constant you can have is greater then 1ms? Remember that to get to within 10 percent of the computed gain will take multiple timeconstants.... I agree that a 'gain rider' poses no particular problem at 44.1 or 48K, but even then lowpassing the audio input to ensure you have the bandwidth to work in would be a good idea (Think crash cymbal hit). However for anything fast (and there are well respected hardware compressors with attack TCs down to 100us), you need substantially more then 44.1 both in the sidechain and in the gain cell and that means you need resampling. Regards, Dan. Send instant messages to your online friends http://uk.messenger.yahoo.com
