i18n: localize mutual match page to English

feature/cw/src/main/cpp/fldigi/fftfilt.h

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+// ----------------------------------------------------------------------------
+// Copyright (C) 2014
+//              David Freese, W1HKJ
+//
+// This file is part of fldigi
+//
+// fldigi 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 3 of the License, or
+// (at your option) any later version.
+//
+// fldigi 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, see <http://www.gnu.org/licenses/>.
+// ----------------------------------------------------------------------------
+
+#ifndef	_FFTFILT_H
+#define	_FFTFILT_H
+
+#include "complex.h"
+#include "gfft.h"
+
+//----------------------------------------------------------------------
+
+class fftfilt {
+enum {NONE, BLACKMAN, HAMMING, HANNING};
+
+protected:
+	int flen;
+	int flen2;
+	g_fft<double> *fft;
+	g_fft<double> *ift;
+	cmplx *ht;
+	cmplx *filter;
+	cmplx *timedata;
+	cmplx *freqdata;
+	cmplx *ovlbuf;
+	cmplx *output;
+	int inptr;
+	int pass;
+	int window;
+
+	inline double fsinc(double fc, int i, int len) {
+		return (i == len/2) ? 2.0 * fc: 
+				sin(2 * M_PI * fc * (i - len/2)) / (M_PI * (i - len/2));
+	}
+	inline double _blackman(int i, int len) {
+		return (0.42 - 
+				 0.50 * cos(2.0 * M_PI * i / len) + 
+				 0.08 * cos(4.0 * M_PI * i / len));
+	}
+	void init_filter();
+	void clear_filter();
+
+public:
+	fftfilt(double f1, double f2, int len);
+	fftfilt(double f, int len);
+	~fftfilt();
+// f1 < f2 ==> bandpass
+// f1 > f2 ==> band reject
+	void create_filter(double f1, double f2);
+	void create_lpf(double f) {
+		create_filter(0, f);
+	}
+	void create_hpf(double f) {
+		create_filter(f, 0);
+	}
+	void rtty_filter(double);
+
+	int run(const cmplx& in, cmplx **out);
+	int flush_size();
+};
+
+#endif