Filter audio noise/spikes while recording

[Lasoul]

I have got audio spikes in my recordings with GBPVR (I hear them as squeeks, pitch goes up). I have the following setup ProgDVB->DVBSBridge->GBPVR.

I tried al lot of combo's Mux/audio decoders etc. As last resort I was wondering If I could use ffdshow for filtering out the noise spikes. I see that ffdshow is being used while playing back the file or live tv. But I need it while recording because the audio spikes are in the recording itself (I checked with an other player).

Does anyone have an idee of how to get rid of those audio spikes (squeeks). They are very irritating while watching an recording!

Thanks for the help...