Digital video tape recorder apparatus

Details Digital video tape recorder apparatus Digital video tape recorder apparatus

1984-03-21

1986-03-18

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

375 81, G11B 509

Patent

active

045772410

ABSTRACT:
Apparatus for regenerating a clock pulse signal from a stream of data derived from a variable-speed digital video tape recorder and lacking a strong clock pulse component, comprises a first phase-locked loop circuit to which the incoming data is supplied and which includes a loop filter of relatively wide bandwidth and a first voltage controlled oscillator. The first voltage controlled oscillator supplies a regenerated clock pulse signal to a second phase-locked loop circuit which includes a loop filter of relatively narrow bandwidth and a second voltage controlled oscillator which supplies a regenerated output clock pulse signal. The first and second voltage controlled oscillators are controlled by a preset control signal derived by a preset control signal generator arrangement in dependence on the direction and speed of a magnetic tape from which the video tape recorder is reproducing the stream of data.

REFERENCES:
patent: 3900890 (1975-08-01), Eibner
patent: 4231071 (1980-10-01), Anderson

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