Time code reader in a device for reproducing video signals from

Details Time code reader in a device for reproducing video signals from Time code reader in a device for reproducing video signals from

1989-12-29

1990-08-28

Stephan, Steven L.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

358336, 360 103, 360 143, 360 722, H04N 5783

Patent

active

049530402

ABSTRACT:
Picture field ordinal numbers recorded near the synchronizing signals of video tape recordings are currently stored in a register as the tape is played back while a modulo 4 up/down counter is incremented or decremented according to the direction of tape transport. A comparison operation checks whether the picture field numbering is in step with the counter for detection of discontinuities or errors. Then a longitudinal track with coded pulses can be read from the tape. A further comparison can be made for checking reliability, bridging errors, and for detecting and indicating discontinuities in picture field numbering sequences.

REFERENCES:
patent: 3921220 (1975-11-01), Primosch
patent: 4167759 (1979-09-01), Tachi
patent: 4195319 (1980-03-01), Ida
patent: 4268876 (1981-05-01), Sakamoto
patent: 4473853 (1984-09-01), Corhery
patent: 4503470 (1985-03-01), Mita
patent: 4507691 (1985-03-01), Ishiguro
patent: 4550349 (1985-10-01), Okuyama
EBU-Document Tech. 30/97-E, Title page, p. 14, 4/82.

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