From 0929d45ec8791bed5f9e48a9232f30504b77dde9 Mon Sep 17 00:00:00 2001
From: Tim Blechmann <timblech@users.sourceforge.net>
Date: Sun, 8 Aug 2004 16:29:26 +0000
Subject: brf & bpf
svn path=/trunk/externals/tb/; revision=1919
---
sc4pd/make-files.txt | 2 +-
sc4pd/pd/bpf.pd | 15 ++++
sc4pd/pd/brf.pd | 15 ++++
sc4pd/source/BPF.cpp | 190 +++++++++++++++++++++++++++++++++++++++++++++++
sc4pd/source/BRF.cpp | 199 ++++++++++++++++++++++++++++++++++++++++++++++++++
sc4pd/source/main.cpp | 7 +-
6 files changed, 426 insertions(+), 2 deletions(-)
create mode 100644 sc4pd/pd/bpf.pd
create mode 100644 sc4pd/pd/brf.pd
create mode 100644 sc4pd/source/BPF.cpp
create mode 100644 sc4pd/source/BRF.cpp
(limited to 'sc4pd')
diff --git a/sc4pd/make-files.txt b/sc4pd/make-files.txt
index 6e6c552..3f7bdc8 100755
--- a/sc4pd/make-files.txt
+++ b/sc4pd/make-files.txt
@@ -14,4 +14,4 @@ SRCS= \
DelayC.cpp CombN.cpp CombL.cpp CombC.cpp AllpassN.cpp AllpassL.cpp \
AllpassC.cpp PitchShift.cpp Resonz.cpp OnePole.cpp OneZero.cpp \
TwoPole.cpp TwoZero.cpp FOS.cpp SOS.cpp RLPF.cpp RHPF.cpp LPF.cpp \
- HPF.cpp
+ HPF.cpp BPF.cpp BRF.cpp
diff --git a/sc4pd/pd/bpf.pd b/sc4pd/pd/bpf.pd
new file mode 100644
index 0000000..5255af9
--- /dev/null
+++ b/sc4pd/pd/bpf.pd
@@ -0,0 +1,15 @@
+#N canvas 0 0 450 300 10;
+#X obj 124 220 dac~;
+#X floatatom 224 81 5 0 0 0 - - -;
+#X obj 130 89 WhiteNoise~;
+#X msg 201 121 kfreq \$1;
+#X floatatom 294 81 5 0 0 0 - - -;
+#X obj 130 147 BPF~ 440 0.5;
+#X msg 271 121 krq \$1;
+#X connect 1 0 3 0;
+#X connect 2 0 5 0;
+#X connect 3 0 5 0;
+#X connect 4 0 6 0;
+#X connect 5 0 0 0;
+#X connect 5 0 0 1;
+#X connect 6 0 5 0;
diff --git a/sc4pd/pd/brf.pd b/sc4pd/pd/brf.pd
new file mode 100644
index 0000000..df92c7c
--- /dev/null
+++ b/sc4pd/pd/brf.pd
@@ -0,0 +1,15 @@
+#N canvas 0 0 450 300 10;
+#X obj 124 220 dac~;
+#X floatatom 224 81 5 0 0 0 - - -;
+#X obj 130 89 WhiteNoise~;
+#X msg 201 121 kfreq \$1;
+#X floatatom 294 81 5 0 0 0 - - -;
+#X msg 271 121 krq \$1;
+#X obj 130 147 BRF~ 4440 4.3;
+#X connect 1 0 3 0;
+#X connect 2 0 6 0;
+#X connect 3 0 6 0;
+#X connect 4 0 5 0;
+#X connect 5 0 6 0;
+#X connect 6 0 0 0;
+#X connect 6 0 0 1;
diff --git a/sc4pd/source/BPF.cpp b/sc4pd/source/BPF.cpp
new file mode 100644
index 0000000..f998dd4
--- /dev/null
+++ b/sc4pd/source/BPF.cpp
@@ -0,0 +1,190 @@
+/* sc4pd
+ BPF~
+
+ Copyright (c) 2004 Tim Blechmann.
+
+ This code is derived from:
+ SuperCollider real time audio synthesis system
+ Copyright (c) 2002 James McCartney. All rights reserved.
+ http://www.audiosynth.com
+
+
+ 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ Based on:
+ PureData by Miller Puckette and others.
+ http://www.crca.ucsd.edu/~msp/software.html
+ FLEXT by Thomas Grill
+ http://www.parasitaere-kapazitaeten.net/ext
+ SuperCollider by James McCartney
+ http://www.audiosynth.com
+
+ Coded while listening to: Jo Kondo: Works For Piano
+
+*/
+
+#include "sc4pd.hpp"
+
+/* ------------------------ BPF~ -------------------------------*/
+
+class BPF_ar:
+ public sc4pd_dsp
+{
+ FLEXT_HEADER(BPF_ar,sc4pd_dsp);
+
+public:
+ BPF_ar(int argc, t_atom *argv);
+
+protected:
+ virtual void m_signal(int n, t_sample *const *in, t_sample *const *out);
+ virtual void m_dsp(int n, t_sample *const *in, t_sample *const *out)
+ {
+ mRadiansPerSample = sc_radianspersample();
+ mFilterSlope = sc_filterslope();
+ mFilterLoops = sc_filterloops();
+ mFilterRemain = sc_filterremain();
+ }
+
+ void m_set_freq(float f)
+ {
+ m_freq=f;
+ changed = true;
+ }
+
+ void m_set_rq(float f)
+ {
+ m_bw=f;
+ changed = true;
+ }
+
+
+private:
+ float m_y1, m_y2, m_a0, m_b1, m_b2, m_freq, m_bw;
+ bool changed;
+ float mRadiansPerSample, mFilterSlope;
+ int mFilterLoops, mFilterRemain;
+
+ FLEXT_CALLBACK_F(m_set_freq);
+ FLEXT_CALLBACK_F(m_set_rq);
+};
+
+FLEXT_LIB_DSP_V("BPF~",BPF_ar);
+
+BPF_ar::BPF_ar(int argc, t_atom *argv)
+{
+ FLEXT_ADDMETHOD_(0,"kfreq",m_set_freq);
+ FLEXT_ADDMETHOD_(0,"krq",m_set_rq);
+
+ //parse arguments
+ AtomList Args(argc,argv);
+
+ m_freq = sc_getfloatarg(Args,0);
+ m_bw = sc_getfloatarg(Args,1);
+ changed = true;
+
+ AddOutSignal();
+
+ m_a0 = 0.f;
+ m_b1 = 0.f;
+ m_b2 = 0.f;
+ m_y1 = 0.f;
+ m_y2 = 0.f;
+}
+
+void BPF_ar::m_signal(int n, t_sample *const *in,
+ t_sample *const *out)
+{
+ t_sample *nin = *in;
+ t_sample *nout = *out;
+
+ float y0;
+ float y1 = m_y1;
+ float y2 = m_y2;
+ float a0 = m_a0;
+ float b1 = m_b1;
+ float b2 = m_b2;
+
+ if (changed)
+ {
+ float pfreq = m_freq * mRadiansPerSample;
+ float pbw = m_bw * pfreq * 0.5;
+
+ float C = 1.f / tan(pbw);
+ float D = 2.f * cos(pfreq);
+
+ float next_a0 = 1.f / (1.f + C);
+ float next_b1 = C * D * next_a0 ;
+ float next_b2 = (1.f - C) * next_a0;
+
+ float a0_slope = (next_a0 - a0) * mFilterSlope;
+ float b1_slope = (next_b1 - b1) * mFilterSlope;
+ float b2_slope = (next_b2 - b2) * mFilterSlope;
+
+ for (int i = 0; i!= mFilterLoops;++i)
+ {
+ y0 = ZXP(nin) + b1 * y1 + b2 * y2;
+ ZXP(nout) = a0 * (y0 - y2);
+
+ y2 = ZXP(nin) + b1 * y0 + b2 * y1;
+ ZXP(nout) = a0 * (y2 - y1);
+
+ y1 = ZXP(nin) + b1 * y2 + b2 * y0;
+ ZXP(nout) = a0 * (y1 - y0);
+
+ a0 += a0_slope;
+ b1 += b1_slope;
+ b2 += b2_slope;
+ }
+
+ for (int i = 0; i!= mFilterRemain;++i)
+ {
+ y0 = ZXP(nin) + b1 * y1 + b2 * y2;
+ ZXP(nout) = a0 * (y0 - y2);
+ y2 = y1;
+ y1 = y0;
+ }
+
+ m_a0 = a0;
+ m_b1 = b1;
+ m_b2 = b2;
+ changed = false;
+ }
+ else
+ {
+ for (int i = 0; i!= mFilterLoops;++i)
+ {
+ y0 = ZXP(nin) + b1 * y1 + b2 * y2;
+ ZXP(nout) = a0 * (y0 - y2);
+
+ y2 = ZXP(nin) + b1 * y0 + b2 * y1;
+ ZXP(nout) = a0 * (y2 - y1);
+
+ y1 = ZXP(nin) + b1 * y2 + b2 * y0;
+ ZXP(nout) = a0 * (y1 - y0);
+ }
+
+ for (int i = 0; i!= mFilterRemain;++i)
+ {
+ y0 = ZXP(nin) + b1 * y1 + b2 * y2;
+ ZXP(nout) = a0 * (y0 - y2);
+ y2 = y1;
+ y1 = y0;
+ }
+ }
+ m_y1 = zapgremlins(y1);
+ m_y2 = zapgremlins(y2);
+}
+
+/* no control rate BPF filter */
diff --git a/sc4pd/source/BRF.cpp b/sc4pd/source/BRF.cpp
new file mode 100644
index 0000000..e6db680
--- /dev/null
+++ b/sc4pd/source/BRF.cpp
@@ -0,0 +1,199 @@
+/* sc4pd
+ BRF~
+
+ Copyright (c) 2004 Tim Blechmann.
+
+ This code is derived from:
+ SuperCollider real time audio synthesis system
+ Copyright (c) 2002 James McCartney. All rights reserved.
+ http://www.audiosynth.com
+
+
+ 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ Based on:
+ PureData by Miller Puckette and others.
+ http://www.crca.ucsd.edu/~msp/software.html
+ FLEXT by Thomas Grill
+ http://www.parasitaere-kapazitaeten.net/ext
+ SuperCollider by James McCartney
+ http://www.audiosynth.com
+
+ Coded while listening to: Jo Kondo: Works For Piano
+
+*/
+
+#include "sc4pd.hpp"
+
+/* ------------------------ BRF~ -------------------------------*/
+
+class BRF_ar:
+ public sc4pd_dsp
+{
+ FLEXT_HEADER(BRF_ar,sc4pd_dsp);
+
+public:
+ BRF_ar(int argc, t_atom *argv);
+
+protected:
+ virtual void m_signal(int n, t_sample *const *in, t_sample *const *out);
+ virtual void m_dsp(int n, t_sample *const *in, t_sample *const *out)
+ {
+ mRadiansPerSample = sc_radianspersample();
+ mFilterSlope = sc_filterslope();
+ mFilterLoops = sc_filterloops();
+ mFilterRemain = sc_filterremain();
+ }
+
+ void m_set_freq(float f)
+ {
+ m_freq=f;
+ changed = true;
+ }
+
+ void m_set_rq(float f)
+ {
+ m_bw=f;
+ changed = true;
+ }
+
+
+private:
+ float m_y1, m_y2, m_a0, m_a1, m_b2, m_freq, m_bw;
+ bool changed;
+ float mRadiansPerSample, mFilterSlope;
+ int mFilterLoops, mFilterRemain;
+
+ FLEXT_CALLBACK_F(m_set_freq);
+ FLEXT_CALLBACK_F(m_set_rq);
+};
+
+FLEXT_LIB_DSP_V("BRF~",BRF_ar);
+
+BRF_ar::BRF_ar(int argc, t_atom *argv)
+{
+ FLEXT_ADDMETHOD_(0,"kfreq",m_set_freq);
+ FLEXT_ADDMETHOD_(0,"krq",m_set_rq);
+
+ //parse arguments
+ AtomList Args(argc,argv);
+
+ m_freq = sc_getfloatarg(Args,0);
+ m_bw = sc_getfloatarg(Args,1);
+ changed = true;
+
+ AddOutSignal();
+
+ m_a0 = 0.f;
+ m_a1 = 0.f;
+ m_b2 = 0.f;
+ m_y1 = 0.f;
+ m_y2 = 0.f;
+}
+
+void BRF_ar::m_signal(int n, t_sample *const *in,
+ t_sample *const *out)
+{
+ t_sample *nin = *in;
+ t_sample *nout = *out;
+
+ float ay;
+ float y0;
+ float y1 = m_y1;
+ float y2 = m_y2;
+ float a0 = m_a0;
+ float a1 = m_a1;
+ float b2 = m_b2;
+
+ if (changed)
+ {
+ float pfreq = m_freq * mRadiansPerSample;
+ float pbw = m_bw * pfreq * 0.5;
+
+ float C = tan(pbw);
+ float D = 2.f * cos(pfreq);
+
+ float next_a0 = 1.f / (1.f + C);
+ float next_a1 = -D * next_a0;
+ float next_b2 = (1.f - C) * next_a0;
+
+ float a0_slope = (next_a0 - a0) * mFilterSlope;
+ float a1_slope = (next_a1 - a1) * mFilterSlope;
+ float b2_slope = (next_b2 - b2) * mFilterSlope;
+
+ for (int i = 0; i!= mFilterLoops;++i)
+ {
+ ay = a1 * y1;
+ y0 = ZXP(nin) - ay - b2 * y2;
+ ZXP(nout) = a0 * (y0 + y2) + ay;
+
+ ay = a1 * y0;
+ y2 = ZXP(nin) - ay - b2 * y1;
+ ZXP(nout) = a0 * (y2 + y1) + ay;
+
+ ay = a1 * y2;
+ y1 = ZXP(nin) - ay - b2 * y0;
+ ZXP(nout) = a0 * (y1 + y0) + ay;
+
+ a0 += a0_slope;
+ a1 += a1_slope;
+ b2 += b2_slope;
+ }
+
+ for (int i = 0; i!= mFilterRemain;++i)
+ {
+ ay = a1 * y1;
+ y0 = ZXP(nin) - ay - b2 * y2;
+ ZXP(nout) = a0 * (y0 + y2) + ay;
+ y2 = y1;
+ y1 = y0;
+ }
+
+ m_a0 = a0;
+ m_a1 = a1;
+ m_b2 = b2;
+ changed = false;
+ }
+ else
+ {
+ for (int i = 0; i!= mFilterLoops;++i)
+ {
+ ay = a1 * y1;
+ y0 = ZXP(nin) - ay - b2 * y2;
+ ZXP(nout) = a0 * (y0 + y2) + ay;
+
+ ay = a1 * y0;
+ y2 = ZXP(nin) - ay - b2 * y1;
+ ZXP(nout) = a0 * (y2 + y1) + ay;
+
+ ay = a1 * y2;
+ y1 = ZXP(nin) - ay - b2 * y0;
+ ZXP(nout) = a0 * (y1 + y0) + ay;
+ }
+
+ for (int i = 0; i!= mFilterRemain;++i)
+ {
+ ay = a1 * y1;
+ y0 = ZXP(nin) - ay - b2 * y2;
+ ZXP(nout) = a0 * (y0 + y2) + ay;
+ y2 = y1;
+ y1 = y0;
+ }
+ }
+ m_y1 = zapgremlins(y1);
+ m_y2 = zapgremlins(y2);
+}
+
+/* no control rate BRF filter */
diff --git a/sc4pd/source/main.cpp b/sc4pd/source/main.cpp
index f01a7ad..6d35894 100644
--- a/sc4pd/source/main.cpp
+++ b/sc4pd/source/main.cpp
@@ -64,7 +64,8 @@ void sc4pd_library_setup()
"AllpassL~,\n"
" AllpassC~, PitchShift~, Resonz~, OnePole(~), OneZero(~), "
"TwoPole~, \n"
- " TwoZero~, FOS(~), SOS~, RLPF~, RHPF~, LPF~, HPF~"
+ " TwoZero~, FOS(~), SOS~, RLPF~, RHPF~, LPF~, HPF~, BPF~, "
+ "BRF~"
"\n"
);
@@ -257,6 +258,10 @@ void sc4pd_library_setup()
FLEXT_DSP_SETUP(LPF_ar);
FLEXT_DSP_SETUP(HPF_ar);
+
+ FLEXT_DSP_SETUP(BPF_ar);
+
+ FLEXT_DSP_SETUP(BRF_ar);
}
FLEXT_LIB_SETUP(sc4pd,sc4pd_library_setup);
--
cgit v1.2.1