Tape timer apparatus for video tape recorder

Details Tape timer apparatus for video tape recorder Tape timer apparatus for video tape recorder

1983-10-21

1986-12-16

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Record editing

360137, 360 71, 360 721, 369 19, G11B 2710

Patent

active

046301372

ABSTRACT:
A tape timer apparatus is disclosed. Apparatus is provided for producing frame pulses indicating a frame period in a running tape and for producing a tape direction signal. An up/down counter counts up or down, as determined by the tape direction signal, in response to the frame pulses. A detecting circuit generates a detection signal indicating whether the frequency of the frame pulse has exceeded a predetermined frequency. A circuit is also provided for dividing the frame pulses by a predetermined number and generating a single frequency divided pulse each time the predetermined number of frame pulses is generated. A selection circuit selects, in accordance with the detection circuit, either the frame pulse or the frequency divided pulse. A microcomputer receives the pulse from the selecting means as an interruption demand pulse and calculates the tape time on the basis of the value counted by the up/down counter.

REFERENCES:
patent: 3939491 (1976-02-01), Shigeta
patent: 4140896 (1979-02-01), Robertson
patent: 4151566 (1979-04-01), Ohrman
patent: 4363048 (1982-12-01), Tanaka et al.
patent: 4463391 (1984-07-01), Takano et al.

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