Tape timer error corrector circuit for tape recorder/reproducers

Details Tape timer error corrector circuit for tape recorder/reproducers Tape timer error corrector circuit for tape recorder/reproducers

1976-03-19

1977-07-19

Konick, Bernard

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 14, 360 70, G11B 1552, G11B 1554

Patent

active

040372600

ABSTRACT:
An error corrector circuit for correcting a tape timer in a video tape recorder/reproducer (VTR) having a multiple frequency control track, wherein a selected control track frequency is separated from the composite frequencies via commutating filter means capable of following frequency variations caused by variable tape speeds. The resulting filtered control track signal of selected frequency is phase compared with a tach clock signal of similar frequency obtained from the capstan tachometer. In the absence of slip, creep, tension variations, and other speed errors caused by playing the tape on different devices, there is no phase difference between the compared signals, which are thus phase locked together. Any phase deviations between the filtered control signal and the tach clock signal are detected and fed back to correct the tach clock signal so that it accurately represents the passage of tape past the VTR head means. A television frame rate pulse output derived from the corrected tach clock signal is fed to the tape timer of the VTR.

REFERENCES:
patent: 3772468 (1973-11-01), Tatsuguchi
patent: 3836756 (1974-09-01), Yammoto

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