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cmVectOpsTemplateCode.h : Fixed problem in SynthImpulse which would cause it to produce noisey output.

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kevin 2015-08-27 12:59:36 -04:00
parent 62f708f04b
commit 1276770efb
1 changed files with 13 additions and 32 deletions
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45
vop/cmVectOpsTemplateCode.h
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@ -1891,42 +1891,23 @@ unsigned VECT_OP_FUNC(SynthPulseCos)( VECT_OP_TYPE* dbp, unsigned dn, unsi
unsigned VECT_OP_FUNC(SynthImpulse)( VECT_OP_TYPE* dbp, unsigned dn, unsigned phase, double srate, double hz ) unsigned VECT_OP_FUNC(SynthImpulse)( VECT_OP_TYPE* dbp, unsigned dn, unsigned phase, double srate, double hz )
{ {
const VECT_OP_TYPE* dep = dbp + dn;
double pi2 = 2.0*M_PI;
double rps = pi2*hz/srate;
double v0,v1 = fmod( rps * phase, pi2); VECT_OP_FUNC(Zero)(dbp,dn);
unsigned i=0;
if( dbp == dep ) while(1)
return phase;
// the phase is set to zero when the first output should be a 1
if( phase == 0 )
{ {
*dbp++ = 1; double samplesPerCycle = srate / hz;
++phase; unsigned j = round( (srate * i + phase) / hz);
if( j >= dn )
break;
dbp[j] = 1;
++i;
} }
// Note that returning an integer value here loses precision
while( dbp < dep ) // since j was rounded to the nearest integer.
{ return j - dn;
// the phase vector will always be increasing
// the modulus of the phase vector will wrap with frequency 'hz'
v0 = fmod( rps * phase++, pi2 );
// notice when wrapping occurs
*dbp++ = (VECT_OP_TYPE)(v0 < v1);
v1 = v0;
}
// check if the next output should be a 1
// (this eliminates the problem of not having access to v1 on the next call to this function
if( fmod( rps * phase, pi2 ) < v1 )
phase = 0;
return phase;
} }
VECT_OP_TYPE VECT_OP_FUNC(SynthPinkNoise)( VECT_OP_TYPE* dbp, unsigned n, VECT_OP_TYPE delaySmp ) VECT_OP_TYPE VECT_OP_FUNC(SynthPinkNoise)( VECT_OP_TYPE* dbp, unsigned n, VECT_OP_TYPE delaySmp )