Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1987-01-16
1987-10-27
Miska, Vit W.
Communications: electrical
Audible indication
Percussion-type sound producer
360 142, 360321, 360 722, H03K 1324, G11B 2702
Patent
active
047033118
ABSTRACT:
A method for transferring an information code onto the synchronization track of a video tape is described. The code is recorded during intervals between synch pulses by adding code pulses of the same magnetization as the recorded synch pulses on the synchronization track. The code pulses, at least in part, overlap the synch pulse with the length of the code pulses representing binary values. With this technique, an erasure of pre-recorded synch pulses is not required. A recording device is used that contains a generator of code pulses and at least two timing elements which are set when a synch signal in response to a detected synch pulse is produced. One of timing elements operates a mode changeover switch and the other activates the code pulse generator. A reading device is used and contains two threshold detectors which detect two synch signals, representative of the beginning and ending of recorded synch signals. In response at least one timing element is started at the beginning of the synch signal. A code evaluation circuit is used to determine if the end of the synch signal appeared during the running period of the latter timing element or after it. A pre-recorded video tape is described to carry twice-magnetized sections on its synchronization track of at most about the length of the synch pulse recording and, following that, once-magnetized sections of either of two different lengths, both preferably being shorter than the synch pulse recording itself.
REFERENCES:
patent: 4100575 (1978-07-01), Morio et al.
patent: 4112445 (1978-09-01), Steinkopf et al.
patent: 4134130 (1979-01-01), Tachi
patent: 4167028 (1979-09-01), Tebey
patent: 4167759 (1979-09-01), Tachi
patent: 4549231 (1985-10-01), Namiki
patent: 4616270 (1986-10-01), Nishimoto
GSE Electronic Systems, Inc.
Kontler Peter K.
Miska Vit W.
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