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cmProc5.h/c : Added parameter setters to cmNlmsEc.

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This commit is contained in:
kevin 2015-09-03 17:54:20 -04:00
parent 7c6a0f5da5
commit 2d1f53c3d0
2 changed files with 84 additions and 31 deletions
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103
cmProc5.c
View File

@ -914,18 +914,20 @@ cmRC_t cmReflectCalcWrite( cmReflectCalc_t* p, const char* dirStr )
//=======================================================================================================================
//
//
cmNlmsEc_t* cmNlmsEcAlloc( cmCtx* ctx, cmNlmsEc_t* ap, float mu, unsigned hN, unsigned delayN )
cmNlmsEc_t* cmNlmsEcAlloc( cmCtx* ctx, cmNlmsEc_t* ap, double srate, float mu, unsigned hN, unsigned delayN )
{
cmNlmsEc_t* p = cmObjAlloc(cmNlmsEc_t,ctx,ap);
bool debugFl = false;
// allocate the vect array's
p->uVa = cmVectArrayAlloc(ctx, kFloatVaFl );
p->fVa = cmVectArrayAlloc(ctx, kFloatVaFl );
p->eVa = cmVectArrayAlloc(ctx, kFloatVaFl );
p->uVa = debugFl ? cmVectArrayAlloc(ctx, kFloatVaFl ) : NULL;
p->fVa = debugFl ? cmVectArrayAlloc(ctx, kFloatVaFl ) : NULL;
p->eVa = debugFl ? cmVectArrayAlloc(ctx, kFloatVaFl ) : NULL;
if( mu != 0 )
if( cmNlmsEcInit(p,mu,hN,delayN) != cmOkRC )
if( srate != 0 )
if( cmNlmsEcInit(p,srate,mu,hN,delayN) != cmOkRC )
cmNlmsEcFree(&p);
return p;
@ -952,18 +954,24 @@ cmRC_t cmNlmsEcFree( cmNlmsEc_t** pp )
}
cmRC_t cmNlmsEcInit( cmNlmsEc_t* p, float mu, unsigned hN, unsigned delayN )
cmRC_t cmNlmsEcInit( cmNlmsEc_t* p, double srate, float mu, unsigned hN, unsigned delayN )
{
cmRC_t rc = cmOkRC;
if((rc = cmNlmsEcFinal(p)) != cmOkRC )
return rc;
assert( srate >= hN );
assert( srate >= delayN );
p->mu = mu;
p->hN = hN;
p->delayN = delayN;
p->wV = cmMemResizeZ(double,p->wV,hN);
p->hV = cmMemResizeZ(double,p->hV,hN);
p->delayN = cmMax(1,delayN);
p->dN = srate;
p->delayV = cmMemResizeZ(cmSample_t, p->delayV, srate );
p->di = 0;
p->wV = cmMemResizeZ(double,p->wV,srate);
p->hV = cmMemResizeZ(double,p->hV,srate);
p->w0i = 0;
return rc;
@ -972,16 +980,6 @@ cmRC_t cmNlmsEcInit( cmNlmsEc_t* p, float mu, unsigned hN, unsigned delayN
cmRC_t cmNlmsEcFinal( cmNlmsEc_t* p )
{ return cmOkRC; }
/*
for n=M:N
uv = u(n:-1:n-M+1);
e(n) = d(n)-w'*uv;
w=w+mu/(a + uv'*uv ) * uv * conj(e(n));
endfor
e = e(:).^2;
*/
cmRC_t cmNlmsEcExec( cmNlmsEc_t* p, const cmSample_t* xV, const cmSample_t* fV, cmSample_t* yV, unsigned xyN )
{
// See: http://www.eit.lth.se/fileadmin/eit/courses/ett042/CE/CE2e.pdf
@ -994,10 +992,17 @@ cmRC_t cmNlmsEcExec( cmNlmsEc_t* p, const cmSample_t* xV, const cmSample_t*
double a = 0.001;
unsigned j;
// insert the next sample into the filter delay line
p->hV[p->w0i] = xV[i];
// Insert the next sample into the filter delay line.
// Note that rather than shifting the delay line on each iteration we
// increment the input location and then align it with the zeroth
// weight below.
p->hV[p->w0i] = p->delayV[ p->di ];
p->delayV[ p->di ] = xV[i];
// calculate the output of the delay w0i:hN
p->di = (p->di + 1) % p->delayN;
// calculate the output of the delay w0i:hN
for(j=p->w0i,k=0; j<p->hN; ++j,++k)
y += p->hV[j] * p->wV[k];
@ -1005,7 +1010,7 @@ cmRC_t cmNlmsEcExec( cmNlmsEc_t* p, const cmSample_t* xV, const cmSample_t*
for(j=0; j<p->w0i; ++j,++k)
y += p->hV[j] * p->wV[k];
// calculate the error
// calculate the error which is also the filter output
double e = fV[i] - y;
yV[i] = e;
@ -1027,9 +1032,14 @@ cmRC_t cmNlmsEcExec( cmNlmsEc_t* p, const cmSample_t* xV, const cmSample_t*
}
cmVectArrayAppendS(p->uVa,xV,xyN);
cmVectArrayAppendS(p->fVa,fV,xyN);
cmVectArrayAppendS(p->eVa,yV,xyN);
if( p->uVa != NULL )
cmVectArrayAppendS(p->uVa,xV,xyN);
if( p->fVa != NULL )
cmVectArrayAppendS(p->fVa,fV,xyN);
if( p->eVa != NULL )
cmVectArrayAppendS(p->eVa,yV,xyN);
return cmOkRC;
@ -1047,7 +1057,44 @@ cmRC_t cmNlmsEcWrite( cmNlmsEc_t* p, const cmChar_t* dirStr )
if( p->eVa != NULL )
cmVectArrayWriteDirFn(p->eVa, dirStr, "nlms_out.va");
return cmOkRC;
}
void cmNlmsEcSetMu( cmNlmsEc_t* p, float mu )
{
if( mu < 0 )
p->mu = 0.0001;
else
if( mu >= 1 )
p->mu = 0.99;
else
p->mu = mu;
}
void cmNlmsEcSetDelayN( cmNlmsEc_t* p, unsigned delayN )
{
if( delayN > p->dN)
delayN = p->dN;
else
if( delayN < 1 )
delayN = 1;
cmVOS_Zero(p->delayV,p->delayN);
p->delayN = delayN;
}
void cmNlmsEcSetIrN( cmNlmsEc_t* p, unsigned hN )
{
if( hN > p->dN )
hN = p->dN;
else
if( hN < 1 )
hN = 1;
cmVOD_Zero(p->wV,p->hN);
cmVOD_Zero(p->hV,p->hN);
p->hN = hN;
}

12
cmProc5.h
View File

@ -234,6 +234,9 @@ extern "C" {
float mu; // LMS step rate
unsigned hN; // filter length
unsigned delayN; // fixed delay to apply to align xV with fV.
unsigned dN; // max length of the fixed delay
cmSample_t* delayV; // delayV[ dN ] fixed delay buffer[]
unsigned di; // delay index
double* wV; // wV[hN] filter weights
double* hV; // hV[hN] filter delay line
unsigned w0i; // The index into hV[] of the start of the delay line.
@ -243,9 +246,9 @@ extern "C" {
cmVectArray_t* eVa;
} cmNlmsEc_t;
cmNlmsEc_t* cmNlmsEcAlloc( cmCtx* ctx, cmNlmsEc_t* p, float mu, unsigned hN, unsigned delayN );
cmNlmsEc_t* cmNlmsEcAlloc( cmCtx* ctx, cmNlmsEc_t* p, double srate, float mu, unsigned hN, unsigned delayN );
cmRC_t cmNlmsEcFree( cmNlmsEc_t** pp );
cmRC_t cmNlmsEcInit( cmNlmsEc_t* p, float mu, unsigned hN, unsigned delayN );
cmRC_t cmNlmsEcInit( cmNlmsEc_t* p, double srate, float mu, unsigned hN, unsigned delayN );
cmRC_t cmNlmsEcFinal( cmNlmsEc_t* p );
// xV[] unfiltered reference signal (direct from xform output)
@ -253,7 +256,10 @@ extern "C" {
// yV[] echo-canelled signal
cmRC_t cmNlmsEcExec( cmNlmsEc_t* p, const cmSample_t* xV, const cmSample_t* fV, cmSample_t* yV, unsigned xyN );
cmRC_t cmNlmsEcWrite( cmNlmsEc_t* p, const cmChar_t* dir );
void cmNlmsEcSetMu( cmNlmsEc_t* p, float mu );
void cmNlmsEcSetDelayN( cmNlmsEc_t* p, unsigned delayN );
void cmNlmsEcSetIrN( cmNlmsEc_t* p, unsigned irN );
#ifdef __cplusplus