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Resolves issue with correct display and scaling of decibel values in

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both the spectral and waterfall displays.

Resolves issue with gain loss in HilbertTransform.
This commit is contained in:
denny
2015-11-08 08:17:34 -05:00
parent 70e62ebb35
commit f0dc9452c8
10 changed files with 214 additions and 83 deletions
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15
src/dsp/filter/hilbert/HilbertTransform.java
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@@ -146,8 +146,7 @@ public class HilbertTransform implements Listener<RealBuffer>
if( mInvertFlag )
{
//inphase
samples[ y ] = -( mCenterCoefficent *
mBuffer[ mIndexMap[ index ][ mCenterTapIndex ] ] );
samples[ y ] = -( mBuffer[ mIndexMap[ index ][ mCenterTapIndex ] ] );
//quadrature
samples[ y + 1 ] = -accumulator;
@@ -155,8 +154,7 @@ public class HilbertTransform implements Listener<RealBuffer>
else
{
//inphase
samples[ y ] = mCenterCoefficent *
mBuffer[ mIndexMap[ index ][ mCenterTapIndex ] ];
samples[ y ] = mBuffer[ mIndexMap[ index ][ mCenterTapIndex ] ];
//quadrature
samples[ y + 1 ] = accumulator;
@@ -255,6 +253,9 @@ public class HilbertTransform implements Listener<RealBuffer>
* a folded FIR structure to exploit the symmetric nature of the half-band
* filter coefficients. The polarity difference between the upper and lower
* halves is accounted for in the filter() method.
*
* Note: we apply a 2.0 gain to the coefficients to compensate for the loss
* of splitting the signal via two filters.
*/
private void convertHalfBandToHilbert( float[] coefficients )
{
@@ -266,15 +267,15 @@ public class HilbertTransform implements Listener<RealBuffer>
{
if( x < middle )
{
mHilbertFilter[ x ] = -Math.abs( coefficients[ x ] );
mHilbertFilter[ x ] = 2.0f * -Math.abs( coefficients[ x ] );
}
else if( x > middle )
{
mHilbertFilter[ x ] = Math.abs( coefficients[ x ] );
mHilbertFilter[ x ] = 2.0f * Math.abs( coefficients[ x ] );
}
else
{
mHilbertFilter[ x ] = coefficients[ x ];
mHilbertFilter[ x ] = 2.0f * coefficients[ x ];
}
}
}