misc.cc

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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);
}