From d1af9e9a4ef6a567eb1f8e3af7d90d975fb77548 Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Thu, 10 Nov 2005 14:35:13 +0000 Subject: imported Olaf Matthes' Max version 1.2 svn path=/trunk/externals/freeverb~/; revision=3869 --- README | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 README (limited to 'README') diff --git a/README b/README new file mode 100644 index 0000000..af9ce32 --- /dev/null +++ b/README @@ -0,0 +1,40 @@ +freeverb~ version 1.2 +reverb external for Pure Data and Max/MSP +written by Olaf Matthes + +based on Freeverb, the free, studio-quality reverb SOURCE CODE in the public +domain, Written by Jezar at Dreampoint - http://www.dreampoint.co.uk + +This software is published under GPL terms, see file LICENSE. + +This is software with ABSOLUTELY NO WARRANTY. +Use it at your OWN RISK. It's possible to damage e.g. hardware or your hearing +due to a bug or for other reasons. + +Recent changes: +- added check for NANs +- added a hand unrolled version of the perform routine for DSP vector sizes that + are a multiple of 8. This should speed up things a bit + + +Below some notes taken from Freeverb readme: +------------------------------------------------------------------------------------- + +Note that this version of Freeverb doesn't contain predelay, or any EQ. I thought +that might make it difficult to understand the "reverb" part of the code. Once you +figure out how Freeverb works, you should find it trivial to add such features with +little CPU overhead. + +Technical Explanation +--------------------- + +Freeverb is a simple implementation of the standard Schroeder/Moorer reverb model. +I guess the only reason why it sounds better than other reverbs, is simply because +I spent a long while doing listening tests in order to create the values found in "tuning.h". It uses 8 comb filters on both the left and right channels), and you +might possibly be able to get away with less if CPU power is a serious constraint +for you. It then feeds the result of the reverb through 4 allpass filters on both +the left and right channels. These "smooth" the sound. Adding more than four allpasses +doesn't seem to add anything significant to the sound, and if you use less, the sound +gets a bit "grainy". The filters on the right channel are slightly detuned compared +to the left channel in order to create a stereo effect. + -- cgit v1.2.1