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#130 MPT-1327 Decoder Filter issue resolved. Converts the post-demodulation filter from a band pass filter to a low-pass filter with 60 dB attenuation and a cutoff of 3200 Hz. This is then followed by a high-pass filter at the decimated channel rate, internal to the decoder that performs DC removal and removes any CTCSS tones prior to the FSK decoder.

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Denny
2017-01-24 20:26:57 -05:00
parent 8b403e6d87
commit 1786ffac47
3 changed files with 83 additions and 53 deletions
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42
src/dsp/filter/design/FilterViewer.java
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@@ -43,33 +43,33 @@ public class FilterViewer extends Application
// FIRFilterSpecification specification = FIRFilterSpecification.lowPassBuilder()
// .sampleRate( 48000 )
// .gridDensity( 16 )
// .passBandCutoff( 3000 )
// .passBandCutoff( 3200 )
// .passBandAmplitude( 1.0 )
// .passBandRipple( 0.01 )
// .passBandRipple( 0.02 )
// .stopBandStart( 4000 )
// .stopBandAmplitude( 0.0 )
// .stopBandRipple( 0.027 )
// .stopBandRipple( 0.03 )
// .build();
// FIRFilterSpecification specification = FIRFilterSpecification.highPassBuilder()
// .sampleRate( 8000 )
// .stopBandCutoff( 250 )
// .stopBandAmplitude( 0.0 )
// .stopBandRipple( 0.01 )
// .passBandStart( 300 )
// .passBandAmplitude( 1.0 )
// .passBandRipple( 0.01 )
// .build();
FIRFilterSpecification specification = FIRFilterSpecification.highPassBuilder()
.sampleRate( 24000 )
.stopBandCutoff( 800 )
.stopBandAmplitude( 0.0 )
.stopBandRipple( 0.03 )
.passBandStart( 1000 )
.passBandAmplitude( 1.0 )
.passBandRipple( 0.08 )
.build();
FIRFilterSpecification specification = FIRFilterSpecification.bandPassBuilder()
.sampleRate( 48000 )
.stopFrequency1( 200 )
.passFrequencyBegin( 400 )
.passFrequencyEnd( 3200 )
.stopFrequency2( 3400 )
.stopRipple( 0.0003 )
.passRipple( 0.008)
.build();
// FIRFilterSpecification specification = FIRFilterSpecification.bandPassBuilder()
// .sampleRate( 48000 )
// .stopFrequency1( 200 )
// .passFrequencyBegin( 400 )
// .passFrequencyEnd( 3200 )
// .stopFrequency2( 3400 )
// .stopRipple( 0.0003 )
// .passRipple( 0.008)
// .build();
float[] taps = null;