A Digital Audio Time-Base Corrector for Linear Magnetic Recording

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Audio time-base correction is an encode/decode process designed to electronically eliminate tape-path azimuth error and the resultant mono sum losses. Flutter is reduced to inaudible levels. A 19-kHz carrier signal is 60% amplitude-modulated by a 300-Hz sinusoidal waveform. This AM pilot signal is encoded onto the left and right audio tracks at −27 dB related to 160-nW/m fluxivity. When an encoded tape is replayed through the complementary decoder, the phase difference between left and right pilot signals is detected and used to servo one of two voltage-controlled digital audio delay lines. The relative left-right delay is adjusted to eliminate phase error. FM components of the pilot signal are demodulated with a phase-locked-loop decoder. The resultant error signal is used to servo both delay lines, significantly reducing flutter. The end result is a clearly audible improvement in reproduction quality.
Publication Date: 1985-11-01
DOI: 10.5594/J03347
Link: https://doi.org/10.5594/J03347
Author(s): Thomas J. Rosback

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Thomas J. Rosback; A Digital Audio Time-Base Corrector for Linear Magnetic Recording, SMPTE Journal ( Volume: 94, Issue: 11, November 1985); SMPTE, 1985. Available at https://doi.org/10.5594/J03347

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Thomas J. Rosback; A Digital Audio Time-Base Corrector for Linear Magnetic Recording, SMPTE Journal ( Volume: 94, Issue: 11, November 1985); SMPTE, 1985. Available at https://doi.org/10.5594/J03347

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Thomas J. Rosback; A Digital Audio Time-Base Corrector for Linear Magnetic Recording, SMPTE Journal ( Volume: 94, Issue: 11, November 1985); SMPTE, 1985. Available at https://doi.org/10.5594/J03347

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<span class="citation">Thomas J. Rosback; <cite>A Digital Audio Time-Base Corrector for Linear Magnetic Recording</cite>, SMPTE Journal ( Volume: 94, Issue: 11, November 1985); SMPTE, 1985. Available at <a href="https://doi.org/10.5594/J03347" target="_blank" rel="noopener">https://doi.org/10.5594/J03347</a></span>

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Thomas J. Rosback; A Digital Audio Time-Base Corrector for Linear Magnetic Recording, SMPTE Journal ( Volume: 94, Issue: 11, November 1985); SMPTE, 1985
doi: 10.5594/J03347
url: https://doi.org/10.5594/J03347

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<li>
Thomas J. Rosback; <cite id="bib-10-5594-j03347">A Digital Audio Time-Base Corrector for Linear Magnetic Recording</cite>, SMPTE Journal ( Volume: 94, Issue: 11, November 1985); SMPTE, 1985
<span class="doi">10.5594/J03347</span>
</li>