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misc.cc
/************************************************************************/
/* */
/* Centre for Speech Technology Research */
/* University of Edinburgh, UK */
/* Copyright (c) 1996,1997 */
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/* the following conditions: */
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/* */
/*************************************************************************/
/* */
/* Author: Richard Caley (rjc@cstr.ed.ac.uk) */
/* -------------------------------------------------------------------- */
/* Some generally useful signal processing things. */
/* */
/*************************************************************************/
#include "EST_Wave.h"
#include "EST_TBuffer.h"
#include "sigpr/EST_misc_sigpr.h"
#include "EST_inline_utils.h"
static void short_set(EST_Wave &to, int ch,
const EST_TBuffer<double> &from,
double maxval)
{
for(int i=0; i<to.num_samples(); i++)
to.a_no_check(i,ch) = irint(from(i)/maxval*10000);
}
/* redundant - see new version in filter */
void EST_pre_emphasis(EST_Wave &signal, EST_Wave &psignal, float a)
{
int num_samples = signal.num_samples();
short last=0;
double maxval=0;
EST_TBuffer<double> fpdata(num_samples);
for(int i=0; i<num_samples; i++)
{
fpdata[i] = signal.a(i) - a*last;
last = signal.a(i);
if (absval(fpdata[i]) > maxval)
maxval = absval(fpdata[i]);
}
psignal.resize(num_samples,1,FALSE);
psignal.set_sample_rate(signal.sample_rate());
short_set(psignal, 0, fpdata, maxval);
}
/* redundant - see new version in filter */
void EST_post_deemphasis(EST_Wave &signal, EST_Wave &dsignal, float a)
{
int num_samples = signal.num_samples();
double last=0;
double maxval=0;
EST_TBuffer<double> fddata(num_samples);
for(int i=0; i<num_samples; i++)
{
fddata[i] = signal.a(i) + a*last;
last = fddata[i];
if (absval(fddata[i]) > maxval)
maxval = absval(fddata[i]);
}
dsignal.resize(num_samples,1,FALSE);
dsignal.set_sample_rate(signal.sample_rate());
short_set(dsignal, 0, fddata, maxval);
}
EST_TBuffer
Definition EST_TBuffer.h:86
EST_Wave
Definition EST_Wave.h:65
EST_Wave::a
short & a(int i, int channel=0)
Definition EST_Wave.cc:128
EST_Wave::sample_rate
int sample_rate() const
return the sampling rate (frequency)
Definition EST_Wave.h:147
EST_Wave::resize
void resize(int num_samples, int num_channels=EST_ALL, int set=1)
resize the waveform
Definition EST_Wave.h:184
EST_Wave::num_samples
int num_samples() const
return the number of samples in the waveform
Definition EST_Wave.h:143
EST_Wave::set_sample_rate
void set_sample_rate(const int n)
Set sampling rate to n.
Definition EST_Wave.h:149