A workflow and novel digital filters for compensating speed and equalization errors on digitized audio open-reel tapes: audio samples

<p>This repository makes available the audio samples related to the experiments described in the paper:&nbsp;</p> <p><em>Niccol&ograve; Pretto, Nadir Dalla Pozza, Alberto Padoan, Anthony Chmiel, Kurt James Werner, Alessandra Micalizzi, Emery Schubert, Antonio Rod&agrave;, Simone Milani and Sergio Canazza. 2021. A workflow and novel digital filters for compensating speed and equalization errors on digitized audio open-reel tapes. In Proceedings of the 16th International Conference on Audio Mostly (AM &#39;21). Association for Computing Machinery, New York, NY, USA</em></p> <p>The experiment and the three case studies are described in the publication below. Here is the summary of their recording/reproducing standards and their notation.</p> <ul> <li>SET A: Recording 3.75 NAB (W3) - Reproducing 7.5 CCIR (R7C);</li> <li>SET B: Recording 3.75 NAB (W3) - Reproducing 15 CCIR (R15C);</li> <li>SET C: Recording 7.5 NAB (W7N) - Reproducing 15 CCIR (R15C).</li> </ul> <p>Here is the notation of the file naming:&nbsp;</p> <ul> <li>W: recording (writing);</li> <li>R: reproducing;</li> <li>3: 3.75 NAB;</li> <li>7N: 7.5 NAB;</li> <li>7C: 7.5 CCIR;</li> <li>15C: 15 CCIR.</li> </ul> <p>Here are the variants of the samples:</p> <ul> <li>REFERENCE: produced by using the correct equalization standard;</li> <li>ANCHOR: the &quot;Reference&quot; altered with a low-pass filter, with pass band set at 7 kHz for music and 3.5 kHz for speech;</li> <li>INCORRECT: produced by using an intentionally incorrect equalization, created by mismatching the recording and reading curves and resampled to the correct speed;</li> <li>MATLAB: the &ldquo;Incorrect&rdquo; variant corrected by means of a Matlab script;</li> <li>API: the &ldquo;Incorrect&rdquo; variant corrected by means of an&nbsp;<em>ad hoc</em>&nbsp;web interface adopting Web Audio API, for simulating real-time correction in web applications.</li> </ul> <p>Here is the samples list:</p> <p>SET A:</p> <ul> <li>Training: <ul> <li>sample4: Richard Wagner -&nbsp;<em>Ride of the Valkyries</em>;</li> </ul> </li> <li>Test: <ul> <li>sample1: Taylor Swift -&nbsp;<em>Shake It Off</em>;</li> <li>sample5: Queen -&nbsp;<em>We Will Rock You</em>;</li> <li>sample8: Bruno Maderna -&nbsp;<em>Continuo</em>;</li> <li>sample9: Luciano Berio -&nbsp;<em>Diff&eacute;rences</em>.</li> </ul> </li> </ul> <p>SET B (the track title reflects the name of the file from which the track itself was extracted, from the CLIPS project of the University of Napoli:&nbsp;<a href="http://www.clips.unina.it/en/index.jsp">http://www.clips.unina.it/en/index.jsp</a>):</p> <ul> <li>Training: <ul> <li>sample22: CLIPS project -&nbsp;<em>LP4m18bZ</em>;</li> </ul> </li> <li>Test: <ul> <li>sample15: CLIPS project -&nbsp;<em>LP1f20bZ</em>;</li> <li>sample16: CLIPS project -&nbsp;<em>LP4m20bZ</em>;</li> <li>sample17: CLIPS project -&nbsp;<em>LP1f19bZ</em>;</li> <li>sample18: CLIPS project -&nbsp;<em>LP4m19bZ</em>.</li> </ul> </li> </ul> <p>SET C:</p> <ul> <li>Training: <ul> <li>sample3: Carl Orff -&nbsp;<em>Carmina Burana - O Fortuna</em>;</li> </ul> </li> <li>Test: <ul> <li>sample2: The Weeknd -&nbsp;<em>Save Your Tears</em>;</li> <li>sample6: Eagles -&nbsp;<em>Hotel California</em>;</li> <li>sample10: Bruno Maderna -&nbsp;<em>Musica su Due Dimensioni</em>;</li> <li>sample12: Bruno Maderna -&nbsp;<em>Syntaxis</em>.</li> </ul> </li> </ul> <p>Supplementary material can be found at the following DOI:&nbsp;10.5281/zenodo.5118708</p> <p>&nbsp;</p>