Re: [SoX-users] looking for a really tight (48db) lowpass filter with minimal effect on the remaining stuff

[Rob S. <aq...@ya...>]

----- Original Message -----

> From: Sergei Steshenko <ser...@ya...>
> To: sox...@li...
> Cc: 
> Sent: Tuesday, 22 January 2013, 10:46
> Subject: Re: [SoX-users] looking for a really tight (48db) lowpass filter with minimal effect on the remaining stuff
> 
> Fundamentally, SoX supports biquadds, so any filter after its transfer function 
> is expressed as biquads can be implemented.
> 
> My earlier comments on phase vs magnitude response and pre-echoes still stand.


Yes, there are several filters available in SoX one could try. I don't think a particularly steep filter is needed, but also, I don't think you'll hear much difference.

E.g. try:

sox -q "|sox -c2 -np synth 3 sin noise remix 1p-2,2p-22" "|sox -c2 -np synth 3 sin noise remix 1p-2,2p-22 sinc -t1k -15500" -d spectrogram


Cheers,

Rob