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@ -386,6 +386,7 @@ span.mainfunction {color: #993300; font-weight: bolder} |
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{"type":"AudioLMSDenoiseNotch_F32","data":{"defaults":{"name":{"value":"new"}},"shortName":"LMS","inputs":"1","output":"0","category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png","outputs":"1"}}, |
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{"type":"AudioSpectralDenoise_F32","data":{"defaults":{"name":{"value":"new"}},"shortName":"Spectral","inputs":"1","output":"0","category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png","outputs":"1"}}, |
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{"type":"AudioFilterFreqWeighting_F32","data":{"defaults":{"name":{"value":"new"}},"shortName":"freqWeight","inputs":"NaN","output":"0","category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png","outputs":"NaN"}}, |
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{"type":"AudioFilterTimeWeighting_F32","data":{"defaults":{"name":{"value":"new"}},"shortName":"timeWeight","inputs":"1","output":"0","category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png","outputs":"1"}}, |
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{"type":"AudioMathAdd_F32","data":{"defaults":{"name":{"value":"new"}},"shortName":"mathAdd","inputs":"2","output":"0","category":"math-function","color":"#E6E0F8","icon":"arrow-in.png","outputs":"1"}}, |
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@ -899,6 +900,114 @@ See Compressor and Compressor2 for complete, ready to use classes.</p> |
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</div> |
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</script> |
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<div> |
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<script type="text/x-red" data-help-name="AudioSpectralDenoise_F32"> |
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<!-- ============ AudioSpectralDenoise_F32 ========= --> |
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<h3>Summary</h3> |
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<div class=tooltipinfo> |
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<p>Spectral Noise Reduction</p> |
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<p>Remove random noise, such as background noise or machine generated noise, and try |
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to leave voice intact.</p> |
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<p>Spectral NR does not try to remove constant tones or clicks and pops.</p> |
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<p>Spectral NR is generally not useful for cleaning up 'pure tone' sources, such as morse code.</p> |
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<h3>Audio Connections</h3> |
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<table class=doc align=center cellpadding=3> |
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<tr class=top><th>Port</th><th>Purpose</th></tr> |
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<tr class=odd><td align=center>In 0</td><td>Signal to be filtered</td></tr> |
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<tr class=odd><td align=center>Out 0</td><td>Filtered Signal Output</td></tr> |
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</table> |
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<h3>Functions</h3> |
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<p class=func><span class=keyword>setup</span>(<strong>AudioSettings_F32 &</strong>settings, <strong>int</strong> n_fft);</p> |
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<p class=desc>Setup the filter. Must be called if parameters not passed in to the |
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constructor. Can be re-called if other parameters have been changed to have |
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the changes take effect. |
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The maximum FFT size is dictated by the underlying FFT_OA code. |
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</p> |
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<p class=func><span class=keyword>enable</span>(<strong>bool</strong> start);</p> |
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<p class=desc>Turn on or offthe filter. The filter is enabled by default upon |
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creation. |
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</p> |
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<p class=func><span class=keyword>enabled</span>();</p> |
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<p class=desc>Return the enabled state of the filter.</p> |
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<p class=func><span class=keyword>getAsnr</span>();</p> |
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<p class=desc>Return the current ASNR value.</p> |
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<p class=func><span class=keyword>setAsnr</span>(<strong>float32_t</strong> value);</p> |
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<p class=desc>Set the ASNR value. Active SNR.</p> |
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<p class=desc>Call <span class=keyword>setup()</span> for the change to take effect.</p> |
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<p class=func><span class=keyword>getVADHighFreq</span>();</p> |
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<p class=desc>Get the VAD band high frequency cutoff value.</p> |
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<p class=func><span class=keyword>setVADHighFreq</span>(<strong>float32_t</strong> value);</p> |
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<p class=desc>Set the VAD High Frequency cutoff value. Sets the high |
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frequency value of the Voice Activity Detector (VAD) window. |
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</p> |
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<p class=desc>Call <span class=keyword>setup()</span> for the change to take effect.</p> |
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<p class=func><span class=keyword>getVADLowFreq</span>();</p> |
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<p class=desc>Get the VAD band low frequency value.</p> |
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<p class=func><span class=keyword>setVADLowFreq</span>(<strong>float32_t</strong> value);</p> |
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<p class=desc>Set the VAD band low frequency value.</p> |
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<p class=desc>Call <span class=keyword>setup()</span> for the change to take effect.</p> |
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<p class=func><span class=keyword>getNRAlpha</span>();</p> |
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<p class=desc>get the NRalpha value. NR alpha is the time smoothing constant. It's |
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range is clipped between 0.9 and 0.9999 in the code. Settings >0.95 |
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generally recommended, or you can get strong reverb and 'watery' effects. |
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</p> |
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<p class=func><span class=keyword>setNRAlpha</span>(<strong>float32_t</strong> value);</p> |
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<p class=desc>Set the NRalpha value.</p> |
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<p class=desc>The change takes effect immediately.</p> |
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<p class=func><span class=keyword>getSNRPrioMin</span>();</p> |
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<p class=desc>Get the SNR prior value.</p> |
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<p class=func><span class=keyword>setSNRPrioMin</span>(<strong>float32_t</strong> value);</p> |
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<p class=desc>Set the SNR prior value.</p> |
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<p class=desc>The change takes effect immediately.</p> |
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<p class=func><span class=keyword>getNRWidth</span>();</p> |
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<p class=desc>Get the NR width. Used for the measuring 'span' in the musical note |
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reduction code. |
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</p> |
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<p class=func><span class=keyword>setNRWidth</span>(<strong>int16_t</strong> value);</p> |
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<p class=desc>Set the NR width.</p> |
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<p class=desc>The change takes effect immediately.</p> |
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<p class=func><span class=keyword>getPowerThreshold</span>();</p> |
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<p class=desc>Get the power threshold. Used to limit the effects of the musical |
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note reduction code. |
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</p> |
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<p class=func><span class=keyword>setPowerThreshold</span>(<strong>float32_t</strong> value);</p> |
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<p class=desc>Set the power threshold.</p> |
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<p class=desc>The change takes effect immediately.</p> |
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<p class=func><span class=keyword>getTaxFactor</span>();</p> |
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<p class=desc>Get the noise output smoothing factor.</p> |
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<p class=func><span class=keyword>setTaxFactor</span>(<strong>float32_t</strong> value);</p> |
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<p class=desc>Set the noise output smoothing factor. Typical values are around 0.8.</p> |
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<p class=desc>Call <span class=keyword>setup()</span> for the change to take effect.</p> |
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<p class=func><span class=keyword>getTapFactor</span>();</p> |
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<p class=desc>Get the speech probability smoothing factor.</p> |
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<p class=func><span class=keyword>setTapFactor</span>(<strong>float32_t</strong> value);</p> |
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<p class=desc>Set the speech probability smoothing factor. Typical values are around 0.9.</p> |
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<p class=desc>Call <span class=keyword>setup()</span> for the change to take effect.</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > OpenAudio_ArduinoLibrary > SpectralDenoise.ino |
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</p> |
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<h3>Notes</h3> |
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<p> The defaults work OK, but it is worth experimenting with the adjustable |
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parameters for your specific situation. Try adjusting NRAlpha, NRWidth and Asnr. |
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</p> |
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<p> The default FFT size is 256. You may wish to make this larger, which will allow |
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a finer granularity of 'buckets' to potentially improve the noise reduction, but, |
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will cost both processor time and memory overheads. |
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</p> |
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<p> The maximum FFT size is set by the underlying <strong>FFT_OA</strong> code, which at |
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time of writing limits the maximum to 2048. |
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</p> |
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<p> The code is written to account for the <strong>sample_rate_Hz</strong> passed in with |
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the audio settings, <strong>but</strong>, this has not been tested. If you do test, |
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either with a higher or lower sample rate, please report back and consider fixing |
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this documentation. |
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</p> |
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<h3>References</h3> |
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<p>The best reference on how the Spectral code was designed and works can be found on the |
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<a href="https://github.com/df8oe/UHSDR/wiki/Noise-reduction"> UHSDR wiki </a> |
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</p> |
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</script> |
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</div> |
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<div> |
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<script type="text/x-red" data-help-name="AudioFilter90Deg_F32"> |
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