2005-03-18 13:40:44 +00:00
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;; fv-basstreble.m4 - fv10k1 package
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;; Defines macros for bass/treble filters
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;;
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;; This is wholly derived from Daniel Bertrand's tone.asm in the emu10k1
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;; driver (see emu10k1/utils/as10k1/effects/tone.asm).
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;;
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2 of the License, or
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;; (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, write to the Free Software
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2017-11-14 14:46:35 +01:00
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;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2005-03-18 13:40:44 +00:00
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;;
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;; $Id: fv-basstreble.inc,v 1.1 2001/09/28 01:56:20 dbertrand Exp $
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;;; a and b coefs for bass:
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b_b con 2.736129417e-01 5.240710533e-01 2.620355267e-01
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a_b con 9.560258858e-01 -4.576868881e-01
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;;; a and b coef for treble:
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b_t con -4.982305773e-01 9.964611547e-01 -4.982305773e-01
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a_t con 9.317583774e-01 -4.356836381e-01
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scalein con 2.449e-05, 1.157407407e-04
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scaleout con 128, 16192
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dly_b1 sta 0,0
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dly_t1 sta 0,0
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tmp dyn 1 ; miscellaneous temp storage
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tmpout dyn 1
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;;; end of bass/treble definitions
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;;;
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;;; This macro applies the bass/treble controls (based on eq2.asm)
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;;;
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basstreble MACRO dest,source,tone_bass,tone_treble,dly_b,dly_t
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;;; tone_bass filter(iir):
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macw tmp, C_0, dly_b+1, a_b+1
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macw tmp, tmp, dly_b , a_b
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macw tmp,tmp,source,scalein
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macints tmp, C_0, tmp, C_2
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macs C_0,C_0,C_0,C_0
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macmv dly_b+1,dly_b, dly_b+1, b_b+2
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macmv dly_b,tmp, dly_b, b_b+1
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macw tmp,ACCUM, tmp, b_b
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macs tmp,C_0,tone_bass,tmp
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macints tmpout,C_0,tmp,scaleout
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;;; tone_treble
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macw tmp, C_0, dly_t+1, a_t+1
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macw tmp, tmp, dly_t , a_t
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macw tmp, tmp, source,scalein+1
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macints tmp,C_0,tmp,C_2
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macs C_0,C_0,C_0,C_0
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macmv dly_t+1,dly_t, dly_t+1, b_t+2
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macmv dly_t,tmp, dly_t, b_t+1
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macw tmp,ACCUM, tmp, b_t
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macs tmp,C_0,tone_treble,tmp
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macints dest,tmpout,tmp,scaleout+1
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ENDM
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;;;
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;;; This macro applies the bass/treble controls (based on eq2.asm)
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;;; and stores results into two separate GPRs
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;;;
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basstreblesep MACRO dest_b,dest_t,source,tone_bass,tone_treble,dly_b,dly_t
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;;; tone_bass filter(iir):
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macw tmp, C_0, dly_b+1, a_b+1
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macw tmp, tmp, dly_b , a_b
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macw tmp,tmp,source,scalein
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macints tmp, C_0, tmp, C_2
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macs C_0,C_0,C_0,C_0
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macmv dly_b+1,dly_b, dly_b+1, b_b+2
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macmv dly_b,tmp, dly_b, b_b+1
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macw tmp,ACCUM, tmp, b_b
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macs tmp,C_0,tone_bass,tmp
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macints tmpout,C_0,tmp,scaleout
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;;; tone_treble
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macw tmp, C_0, dly_t+1, a_t+1
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macw tmp, tmp, dly_t , a_t
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macw tmp, tmp, source,scalein+1
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macints tmp,C_0,tmp,C_2
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macs C_0,C_0,C_0,C_0
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macmv dly_t+1,dly_t, dly_t+1, b_t+2
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macmv dly_t,tmp, dly_t, b_t+1
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macw tmp,ACCUM, tmp, b_t
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macs tmp,C_0,tone_treble,tmp
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macints dest_t,C_0,tmp,scaleout+1
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acc3 dest_b,tmpout,C_0,C_0
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ENDM
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END
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