Dynamic magnetic information storage or retrieval – Record editing
Patent
1982-03-19
1984-06-19
Richardson, Robert L.
Dynamic magnetic information storage or retrieval
Record editing
358343, H04N 5782, G11B 500
Patent
active
044555806
ABSTRACT:
In a video tape recorder for recording and/or playing back a picture carrier which has been angularly modulated with a video signal, the recorder including a rotating capstan drum having two electromagnetic transducer heads mounted to travel along oblique tracks on a magnetic tape and alternatingly scan the tape, both heads being active to scan the tape simultaneously in overlap zones along the drum, an audio carrier which has been frequency modulated with an audio signal is recorded together with the video signal along the oblique tracks, and the recorder is provided with a playback system including a picture signal path and an audio signal path, signal separating circuitry connected between the heads and the paths for conducting the picture carrier to the video signal path and the audio carrier signal to the audio signal path, and signal processing circuitry connected to the audio signal path for additively superposing the audio carrier signal portions provided by both heads, before the audio carrier is demodulated, while causing the audio carrier signal portions provided by one head to differ in amplitude from the audio carrier signal portions provided by the other head in such a manner that in the superposed signal the signal portions provided by one head always differ in amplitude from those provided by the other head.
REFERENCES:
patent: 3830968 (1974-08-01), Redlich et al.
patent: 3839731 (1974-10-01), Gart et al.
patent: 4051515 (1977-09-01), Metzger et al.
patent: 4303950 (1981-12-01), Taniguchi et al.
Nakamura et al. "Simplified Time-Division Color Signal Multiplexing for Video Disc and VTR by Using a New Solid-State Memory" IEEE Transactions Feb. 1976, pp. 54 to 60.
J.-M.L. Toute l'Electronique, "Un Magnetoscope a Cassette Experimental: le (Fixed-Head VCR) de Toshiba" Jun. 1979, pp. 8 and 9.
Licentia Patent-Verwaltungs-GmbH
Richardson Robert L.
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