1 files changed, 48 insertions, 0 deletions
diff --git a/src/filter.h b/src/filter.h
new file mode 100644
index 0000000..ba48424
--- /dev/null
+++ b/src/filter.h
@@ -0,0 +1,48 @@
+/*
+  Copyright (C) 2018 James C. Ahlstrom
+
+  All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License version 2.1, as
+  published by the Free Software Foundation.  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 Lesser General Public License
+  along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __FILTER__
+#define __FILTER__
+
+#include <complex.h>
+
+struct quisk_cfFilter {        // Structure to hold the static data for FIR filters
+    float * dCoefs;            // real filter coefficients
+    complex float * cpxCoefs;  // complex filter coefficients
+    int nBuf;                  // dimension of cBuf
+    int nTaps;                 // dimension of dSamples, cSamples, dCoefs
+    int decim_index;           // index of next sample for decimation
+    complex float * cSamples;  // storage for old samples
+    complex float * ptcSamp;   // next available position in cSamples
+    complex float * cBuf;      // auxiliary buffer for interpolation
+} ;
+
+extern int quisk_cfInterpDecim(complex float *, int, struct quisk_cfFilter *, int, int);
+extern void quisk_filt_cfInit(struct quisk_cfFilter *, float *, int);
+extern void quisk_filt_destroy(struct quisk_cfFilter *);
+extern void quisk_cfTune(struct quisk_cfFilter *, float);
+extern void quisk_ccfFilter(complex float *, complex float *, int, struct quisk_cfFilter *);
+
+extern float filtP400S600[100];
+extern float filtP550S750[160];
+extern float filtP650S900[100];
+extern float filtP900S1100[100];
+extern float filtP1100S1300[100];
+extern float filtP200S400[100];
+extern float quiskFilt120t480[480];
+
+#endif