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#1284 Resolves issue with inherent DC bias (-0.5) in RTL2832 sample conversion code. (#1285)

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Co-authored-by: Dennis Sheirer <dsheirer@github.com>
This commit is contained in:
Denny Sheirer
2022-07-16 08:58:09 -04:00
committed by GitHub
parent f67f90e8b0
commit 414ba25d61
3 changed files with 5 additions and 6 deletions
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3
src/main/java/io/github/dsheirer/buffer/ByteNativeBuffer.java
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@@ -21,7 +21,6 @@ package io.github.dsheirer.buffer;
import io.github.dsheirer.sample.complex.ComplexSamples; import io.github.dsheirer.sample.complex.ComplexSamples;
import io.github.dsheirer.sample.complex.InterleavedComplexSamples; import io.github.dsheirer.sample.complex.InterleavedComplexSamples;
import java.util.Iterator; import java.util.Iterator;
/** /**
@@ -42,7 +41,7 @@ public class ByteNativeBuffer implements INativeBuffer
for(int x = 0; x < 256; x++) for(int x = 0; x < 256; x++)
{ {
LOOKUP_VALUES[x] = (float)(x - 127) / 128.0f; LOOKUP_VALUES[x] = ((float)x - 127.5f) / 128.0f;
} }
} }

4
src/main/java/io/github/dsheirer/buffer/ByteNativeBufferFactory.java
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@@ -45,7 +45,7 @@ public class ByteNativeBufferFactory implements INativeBufferFactory
*/ */
private void calculateDc(byte[] samples) private void calculateDc(byte[] samples)
{ {
double dcAccumulator = 0; float dcAccumulator = 0;
for(byte sample: samples) for(byte sample: samples)
{ {
@@ -53,7 +53,7 @@ public class ByteNativeBufferFactory implements INativeBufferFactory
} }
dcAccumulator /= samples.length; dcAccumulator /= samples.length;
dcAccumulator -= 127.0f; dcAccumulator -= 127.5f;
dcAccumulator /= 128.0f; dcAccumulator /= 128.0f;
dcAccumulator -= mAverageDc; dcAccumulator -= mAverageDc;
mAverageDc += (dcAccumulator * DC_FILTER_GAIN); mAverageDc += (dcAccumulator * DC_FILTER_GAIN);

4
src/main/java/io/github/dsheirer/buffer/SignedByteNativeBufferFactory.java
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@@ -46,8 +46,8 @@ public class SignedByteNativeBufferFactory implements INativeBufferFactory
*/ */
private void calculateDc(byte[] samples) private void calculateDc(byte[] samples)
{ {
double iDcAccumulator = 0; float iDcAccumulator = 0;
double qDcAccumulator = 0; float qDcAccumulator = 0;
for(int x = 0; x < samples.length; x += 2) for(int x = 0; x < samples.length; x += 2)
{ {