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<!DOCTYPE html>
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<head>
<meta charset="utf-8" />
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<title>Release Notes for STM32_AI_AudioPreprocessing_Library Package</title>
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<div class="card fluid">
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<center>
<h1 id="release-notes-for-stm32_ai_audiopreprocessing_library"><small>Release Notes for</small> <strong>STM32_AI_AudioPreprocessing_Library</strong></h1>
<p>Copyright © 2023 STMicroelectronics<br />
</p>
<a href="https://www.st.com" class="logo"><img src="_htmresc/st_logo.png" alt="ST logo" /></a>
</center>
</div>
</div>
<h1 id="purpose">Purpose</h1>
<p>This STM32_AI_AudioPreprocessing_Library is a C Library for audio preprocessing in Artificial Intelligence applications optimized for STM32 devices. It provides the building blocks for spectral analysis and feature extraction, such as:</p>
<ul>
<li>Spectrogram computation</li>
<li>Mel-scaled and LogMel-scaled spectrogram computation</li>
<li>Mel-frequency cepstral coefficients (MFCCs) computation</li>
</ul>
</div>
<section id="update-history" class="col-sm-12 col-lg-8">
<h1>Update History</h1>
<div class="collapse">
<input type="checkbox" id="collapse-section9" checked aria-hidden="true"> <label for="collapse-section9" aria-hidden="true"><strong>1.2.1 / November-2024</strong></label>
<div>
<p>Patch release</p>
<h2 id="main-changes">Main Changes</h2>
<ul>
<li> Added optional normalization in preproc extra processing </li>
</ul>
</ul>
<h2 id="dependencies">Dependencies</h2>
<p>This software release is compatible with:</p>
<ul>
<li>CMSIS Version 5.6.0</li>
<li>CMSIS-DSP Version 1.10.0</li>
</ul>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section9" checked aria-hidden="true"> <label for="collapse-section9" aria-hidden="true"><strong>1.2.0 / October-2024</strong></label>
<div>
<p>New features release</p>
<h2 id="main-changes">Main Changes</h2>
<ul>
<li> Added pre and post processing for speech enhancement models </li>
<ul>
<li> Preprocessing: from in16_t 16kHz audio output a patch made of n-frames of complex spectrum with overlapping </li>
<li> Preprocessing Extra: Compute module from complex spectrum for a patch </li>
<li> Postprocessing: multiply complex spectrum by mask from the model and perform inverse STFT and overlap-add for a patch </li>
</ul>
</ul>
</ul>
<h2 id="dependencies">Dependencies</h2>
<p>This software release is compatible with:</p>
<ul>
<li>CMSIS Version 5.6.0</li>
<li>CMSIS-DSP Version 1.10.0</li>
</ul>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section9" checked aria-hidden="true"> <label for="collapse-section9" aria-hidden="true"><strong>1.1.5 / December-2023</strong></label>
<div>
<p>Maintenance release</p>
<h2 id="main-changes">Main Changes</h2>
<ul>
<li> replaced enum that could have different size according to compiler and compiler options </li>
<li> miscelaneous clean up</li>
</ul>
</ul>
<h2 id="dependencies">Dependencies</h2>
<p>This software release is compatible with:</p>
<ul>
<li>CMSIS Version 5.6.0</li>
<li>CMSIS-DSP Version 1.10.0</li>
</ul>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section8" aria-hidden="true"> <label for="collapse-section8" aria-hidden="true"><strong>1.1.4 / June-2023</strong></label>
<div>
<p>Maintenance release</p>
<h2 id="main-changes">Main Changes</h2>
<ul>
<li> added Float 16 bits version </li>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section7" aria-hidden="true"> <label for="collapse-section7" aria-hidden="true"><strong>1.1.3 / June-2023</strong></label>
<div>
<p>Patch release</p>
<h2 id="main-changes">Main Changes</h2>
<ul>
<li>distributed under BSD-3-Clause </li>
</ul>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section6" aria-hidden="true"> <label for="collapse-section6" aria-hidden="true"><strong>1.1.2 / April-2021</strong></label>
<div>
<p>Patch release</p>
<h2 id="main-changes">Main Changes</h2>
<ul>
<li>Adds usage examples for melspectrogram and MFCC computation</li>
</ul>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section5" aria-hidden="true"> <label for="collapse-section5" aria-hidden="true"><strong>1.1.1 / March-2021</strong></label>
<div>
<p>Patch release</p>
<h2 id="main-changes-1">Main Changes</h2>
<ul>
<li>Fixes DCT Type-II Ortho for MFCC calculation with librosa</li>
</ul>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section4" aria-hidden="true"> <label for="collapse-section4" aria-hidden="true"><strong>1.1.0 / June-2019</strong></label>
<div>
<p>Maintenance release</p>
<h2 id="main-changes-2">Main Changes</h2>
<p>Bug fixes and cleanup</p>
<ul>
<li>Adds magnitude spectrograms support</li>
<li>Adds log scale mel_filterbank support</li>
<li>Updates DCT module</li>
<li>Updates documentation</li>
</ul>
<h2 id="backward-compatibility">Backward Compatibility</h2>
<p>This release breaks compatibility with previous versions.</p>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section3" aria-hidden="true"> <label for="collapse-section3" aria-hidden="true"><strong>1.0.0 / 05-April-2019</strong></label>
<div>
<p>First release</p>
<h2 id="dependencies">Dependencies</h2>
<p>This software release is compatible with:</p>
<ul>
<li>CMSIS Version 4.5.0</li>
<li>CMSIS-DSP Version 1.4.7</li>
</ul>
</div>
</div>
</section>
</div>
</body>
</html>