On Mon, 29 May 2006 09:08:58 +0100 Gordon JC Pearce <wsynth@xxxxxxxx> wrote: > On Mon, 2006-05-29 at 10:05 +0200, Alex Polite wrote: > > Hi there. > > > > I have an interview with a lot of AC hum. I'd like to remove as much > > of the hum as possible. This is not for broadcasting. I just want to > > be able to hear what the persons on the recording are saying. > > > > I've looked at the sound in a frequency spectrum analyzer[1]. The hum > > looks just as consistent as it sounds so I guess there must be a way > > to filter it out. I just don't know which linux tool will do it for > > me. > > Very sharp notch filter? > > Gordon. If it's just for speech then you don't need a notch filter at all, just kill everything below 300Hz. A simple graphic equaliser should be able to do a reasonable job of this. Giving a small boost at around 4kHz can also help improve clarity. -- F
