On Mon, Aug 04, 2008 at 06:43:23PM +0200, kostya wrote: > Author: kostya > Date: Mon Aug 4 18:43:22 2008 > New Revision: 3010 > > Log: > Audio preprocessing for better compression [...9 > +// low-pass filter declarations and code > +#define IIR_ORDER 4 > + > +/** > + * filter data for 4th order IIR lowpass Butterworth filter > + * > + * data format: > + * normalized cutoff frequency | inverse filter gain | coefficients > + */
A lowpass filter should be advantaneous for all MDCT based codecs not just AAC, but then i guess that is true for the whole psychoacoustic stuff ... [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB I wish the Xiph folks would stop pretending they've got something they do not. Somehow I fear this will remain a wish. -- Måns Rullgård
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