;; fv-filters.m4 - fv10k1 package ;; defines delay lines and GPRs for Freeverb's comb and allpass filters ;; ;; Copyright (C) 2001 Oleg Smirnov ;; ;; This program is free software; you can redistribute it and/or modify ;; it under the terms of the GNU General Public License as published by ;; the Free Software Foundation; either version 2 of the License, or ;; (at your option) any later version. ;; ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; ;; You should have received a copy of the GNU General Public License ;; along with this program; if not, write to the Free Software ;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA ;; ;; $Id: fv-filters.m4,v 1.1 2001/09/28 01:56:20 dbertrand Exp $ ; This is a shorter version that only uses 32 address lines ;;; macro to apply & accumulate a comb filter comb MACRO dest,rdelay,wdelay,filterstore acc3 dest,dest,rdelay,C_0 interp filterstore,rdelay,damp,filterstore macs wdelay,input,filterstore,roomsize endm ;;; macro to apply an allpass filter allpass MACRO dest,rdelay,wdelay macs wdelay,dest,rdelay,allpassfeed macs1 dest,rdelay,dest,C_max endm ;;; Freeverb reduced mode - comb filter delay lines go ahead, since for ;;; reduced Freeverb we do not want to use internal TRAM -- it may be out ;;; of address lines thanks to the reflection engine, so external TRAM ;;; is preferrable. Hence longer delays (for comb filters) go first. ;;; Freeverb reduced mode - 4 comb filters only csl5 sta 0 csr5 sta 0 cdl5 delay 1569 cdr5 delay 1594 wcdl5 twrite cdl5,0 wcdr5 twrite cdr5,0 rcdl5 tread cdl5,1549 rcdr5 tread cdr5,1574 csl6 sta 0 csr6 sta 0 cdl6 delay 1645 cdr6 delay 1670 wcdl6 twrite cdl6,0 wcdr6 twrite cdr6,0 rcdl6 tread cdl6,1625 rcdr6 tread cdr6,1650 csl7 sta 0 csr7 sta 0 cdl7 delay 1717 cdr7 delay 1742 wcdl7 twrite cdl7,0 wcdr7 twrite cdr7,0 rcdl7 tread cdl7,1697 rcdr7 tread cdr7,1722 csl8 sta 0 csr8 sta 0 cdl8 delay 1782 cdr8 delay 1807 wcdl8 twrite cdl8,0 wcdr8 twrite cdr8,0 rcdl8 tread cdl8,1762 rcdr8 tread cdr8,1787 ;;; define macro to apply all comb filters to land r do_comb_filters MACRO l,r comb l,rcdl5,wcdl5,csl5 comb l,rcdl6,wcdl6,csl6 comb l,rcdl7,wcdl7,csl7 comb l,rcdl8,wcdl8,csl8 comb r,rcdr5,wcdr5,csr5 comb r,rcdr6,wcdr6,csr6 comb r,rcdr7,wcdr7,csr7 comb r,rcdr8,wcdr8,csr8 ENDM ;;; Now define the allpass filter delay lines ;;; 4 allpass filters apl1 delay 626 apr1 delay 651 wapl1 twrite apl1,0 wapr1 twrite apr1,0 rapl1 tread apl1,606 rapr1 tread apr1,631 apl2 delay 500 apr2 delay 525 wapl2 twrite apl2,0 wapr2 twrite apr2,0 rapl2 tread apl2,480 rapr2 tread apr2,505 apl3 delay 391 apr3 delay 416 wapl3 twrite apl3,0 wapr3 twrite apr3,0 rapl3 tread apl3,371 rapr3 tread apr3,396 apl4 delay 265 apr4 delay 290 wapl4 twrite apl4,0 wapr4 twrite apr4,0 rapl4 tread apl4,245 rapr4 tread apr4,270 do_allpass_filters MACRO l,r allpass l,rapl1,wapl1 allpass l,rapl2,wapl2 allpass l,rapl3,wapl3 allpass l,rapl4,wapl4 allpass r,rapr1,wapr1 allpass r,rapr2,wapr2 allpass r,rapr3,wapr3 allpass r,rapr4,wapr4 ENDM END