Servos for Rapid Cassette Handling and Tape Threading in a Quadruplex Cassette Recorder

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Some aspects of the Ampex Model ACR-25, an automatic cassette VTR using the broadcast 2-in quadruplex format and holding 24 cassettes in a circular carrousel, each with a capacity of up to 6 min of tape, are described. The carrousel is mounted between two vertical transports, and a cassette from any bin location can be selected and injected into either transport. While one transport is playing, another cassette can be located and automatically threaded into the other transport ready to take over. The switch occurs during a vertical interval, so there is no discontinuity of picture. An important feature of the machine is the ability to play spots of 10-s duration. In this 10 s, it is necessary to rewind the tape into the cassette, return it to the carrousel storage area, select a new cassette, and thread and cue before the previous tape has finished playing. Described in some detail are carrousel and tape-reel servos which are important factors in providing this rapid back-to-back operation. The servos described for cassette handling use only fundamental principles and require no routine adjustments. Loop gains can be held to within 3 dB.
Publication Date: 1972-07-01
DOI: 10.5594/J08253
Link: https://doi.org/10.5594/J08253
Author(s): Reginald W. Oldershaw

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Reginald W. Oldershaw; Servos for Rapid Cassette Handling and Tape Threading in a Quadruplex Cassette Recorder, Journal of the SMPTE ( Volume: 81, Issue: 7, July 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J08253

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Reginald W. Oldershaw; Servos for Rapid Cassette Handling and Tape Threading in a Quadruplex Cassette Recorder, Journal of the SMPTE ( Volume: 81, Issue: 7, July 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J08253

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<span class="citation">Reginald W. Oldershaw; <cite>Servos for Rapid Cassette Handling and Tape Threading in a Quadruplex Cassette Recorder</cite>, Journal of the SMPTE ( Volume: 81, Issue: 7, July 1972); SMPTE, 1972. Available at <a href="https://doi.org/10.5594/J08253" target="_blank" rel="noopener">https://doi.org/10.5594/J08253</a></span>

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<li>
Reginald W. Oldershaw; <cite id="bib-10-5594-j08253">Servos for Rapid Cassette Handling and Tape Threading in a Quadruplex Cassette Recorder</cite>, Journal of the SMPTE ( Volume: 81, Issue: 7, July 1972); SMPTE, 1972
<span class="doi">10.5594/J08253</span>
</li>