Wombat;689087 Wrote: > Just create yourself such an impulse and apply a lowpass or resample it. > The post and preringing only happens around fs/2 so above 20kHz. I did > some and with a gentle filter kicking in around 20khz there is virtualy > no ringing left. > Of cause the picture of simply the impulse, not its spectrum is welcome > for marketing :) I agree that the impulse response is very misleading since it represents the response of the filter to an impossible input. BUt still the effect of pre-ringing is confusing. Although it represents to effect of the filter cutting off frequencies above the stop band AFAIK it supposedly spreads out energy throughout the passband. This is where i get confused because it supposedly does so even though the filter has a flat response in the passband- how can it do that (PAGING TEDDY RAY)
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