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Adds support for power-of-2 decimation for both real and complex sample buffers. Creates new class to analyze the filter attenuation rates using a variety of filter lengths and window options to enable selecting the optimal combination of cascaded power-of-2 half band decimation filters. (#1127)

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Co-authored-by: Dennis Sheirer <dsheirer@github.com>
This commit is contained in:
Denny Sheirer
2021-12-31 10:20:15 -05:00
committed by GitHub
parent 5d9d232585
commit 2a0427c559
33 changed files with 1795 additions and 182 deletions
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71
src/main/java/io/github/dsheirer/buffer/FloatCircularBuffer.java
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@@ -1,20 +1,21 @@
/*******************************************************************************
* SDR Trunk
* Copyright (C) 2014 Dennis Sheirer
/*
* *****************************************************************************
* Copyright (C) 2014-2021 Dennis Sheirer
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
******************************************************************************/
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
* ****************************************************************************
*/
package io.github.dsheirer.buffer;
import java.util.Arrays;
@@ -25,13 +26,12 @@ import java.util.Arrays;
* fills buffer with 0-valued samples
*
* Can be used as a delay-type buffer, to delay samples by the 'size' amount
*
* @author denny
*/
public class FloatCircularBuffer
{
float[] mBuffer;
int mBufferPointer = 0;
private float[] mBuffer;
private int mBufferPointer = 0;
private float mOldestSample;
/**
* Creates a circular double buffer of the specified size and all entries filled with the specified initial value.
@@ -61,25 +61,27 @@ public class FloatCircularBuffer
}
/**
* Puts the new value into the buffer and returns the oldest buffer value that it replaced
* Gets the current buffer value and overwrites that value position in the buffer with the new value.
*
* @param newValue to add to the buffer
* @return oldest value that was overwritten by the new value
*/
public float get(float newValue)
public float getAndPut(float newValue)
{
float oldestSample = mBuffer[mBufferPointer];
mOldestSample = mBuffer[mBufferPointer];
put(newValue);
return mOldestSample;
}
mBuffer[mBufferPointer] = newValue;
mBufferPointer++;
if(mBufferPointer >= mBuffer.length)
{
mBufferPointer = 0;
}
return oldestSample;
/**
* Puts the value into the buffer, updates the pointer and returns the buffer value at the pointer position.
* @param sample to add
* @return next pointed sample.
*/
public float putAndGet(float sample)
{
put(sample);
return mBuffer[mBufferPointer];
}
public float[] getAll()
@@ -109,12 +111,7 @@ public class FloatCircularBuffer
public void put(float newValue)
{
mBuffer[mBufferPointer] = newValue;
mBufferPointer++;
if(mBufferPointer >= mBuffer.length)
{
mBufferPointer = 0;
}
mBufferPointer %= mBuffer.length;
}
}