Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1974-09-19
1976-03-30
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
178 695DC, H04N 578
Patent
active
039478734
ABSTRACT:
A circuit for use in a magnetic video tape recorder/playback system capable of detecting not only amplitude loss due to tape defects or loss of head-tape contact, but also zero crossing loss due to an increase of sideband amplitude with respect to carrier amplitude in the playback signal. The circuit comprises a high speed voltage comparator coupled to a one-shot and OR gate arrangement to cause the insertion of a compensating video signal should the FM playback signal fail to have a zero crossing and pass through a threshold level within a predetermined time period.
REFERENCES:
patent: 3865981 (1975-02-01), Welch et al.
BASF - Aktiengesellschaft
Cardillo, Jr. Raymond F.
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