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added if clause to allow new filter code to be used if baud <= 100, if higher then no filter - this allows higher baud rates to be usable in dl-fldigi

pull/1/head
James Coxon 2013-12-11 21:17:25 +00:00
rodzic ef1619e37f
commit 501f86909b
2 zmienionych plików z 37 dodań i 32 usunięć
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26
src/cw_rtty/rtty.cxx
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@ -193,21 +193,23 @@ rtty::~rtty()
void rtty::reset_filters()
{
printf("reseting Filter for Baud %f, %f\n", rtty_baud, samplerate); // print dot length
int filter_length = 1024;
if (mark_filt) {
mark_filt->rtty_filter(rtty_baud/samplerate);
} else {
mark_filt = new fftfilt(rtty_baud/samplerate, filter_length);
mark_filt->rtty_filter(rtty_baud/samplerate);
}
if (mark_filt) {
mark_filt->rtty_filter(rtty_baud/samplerate);
} else {
mark_filt = new fftfilt(rtty_baud/samplerate, filter_length);
mark_filt->rtty_filter(rtty_baud/samplerate);
}
if (space_filt) {
space_filt->rtty_filter(rtty_baud/samplerate);
} else {
space_filt = new fftfilt(rtty_baud/samplerate, filter_length);
space_filt->rtty_filter(rtty_baud/samplerate);
}
if (space_filt) {
space_filt->rtty_filter(rtty_baud/samplerate);
} else {
space_filt = new fftfilt(rtty_baud/samplerate, filter_length);
space_filt->rtty_filter(rtty_baud/samplerate);
}
}
void rtty::restart()

43
src/filters/fftfilt.cxx
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@ -40,6 +40,7 @@
#include <sys/types.h>
#include <unistd.h>
#include <memory.h>
#include "configuration.h"
#include "misc.h"
#include "fftfilt.h"
@ -246,33 +247,35 @@ void fftfilt::rtty_filter(double f)
// 1.4 .0054
// 1.5 .0062
// 1.6 .0076
/*//////////////////////////////////jcoxon
f *= 1.4;
if(progdefaults.RTTY_BW <= 100){
f *= 1.4;
double dht;
for( int i = 0; i < flen2; ++i ) {
double x = (double)i/(double)(flen2);
double dht;
for( int i = 0; i < flen2; ++i ) {
double x = (double)i/(double)(flen2);
// raised cosine response (changed for -1.0...+1.0 times Nyquist-f
// instead of books versions ranging from -1..+1 times samplerate)
// raised cosine response (changed for -1.0...+1.0 times Nyquist-f
// instead of books versions ranging from -1..+1 times samplerate)
dht =
x <= 0 ? 1.0 :
x > 2.0 * f ? 0.0 :
cos((M_PI * x) / (f * 4.0));
dht =
x <= 0 ? 1.0 :
x > 2.0 * f ? 0.0 :
cos((M_PI * x) / (f * 4.0));
dht *= dht; // cos^2
dht *= dht; // cos^2
// amplitude equalized nyquist-channel response
dht /= sinc(2.0 * i * f);
// amplitude equalized nyquist-channel response
dht /= sinc(2.0 * i * f);
filter[i].real() = dht*cos((double)i* - 0.5*M_PI);
filter[i].imag() = dht*sin((double)i* - 0.5*M_PI);
filter[i].real() = dht*cos((double)i* - 0.5*M_PI);
filter[i].imag() = dht*sin((double)i* - 0.5*M_PI);
filter[(flen-i)%flen].real() = dht*cos((double)i*+0.5*M_PI);
filter[(flen-i)%flen].imag() = dht*sin((double)i*+0.5*M_PI);
}
*///////////////////////////////////jcoxon
filter[(flen-i)%flen].real() = dht*cos((double)i*+0.5*M_PI);
filter[(flen-i)%flen].imag() = dht*sin((double)i*+0.5*M_PI);
}
}
else{
}
// perform the reverse fft to obtain h(t)
// for testing