Magnetic recording and reproducing device

Details Magnetic recording and reproducing device Magnetic recording and reproducing device

1987-12-28

1989-09-05

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 60, G11B 509, G11B 1504

Patent

active

048644331

ABSTRACT:
In a magnetic recording and reproducing circuit, a PLL circuit extracts a clock signal from the input signal while a clock generating circuit outputs a clock signal independently of the input signal, and one of the clock signals thus obtained is applied to a signal processing circuit depending on whether or not the PLL is in a locked state. When the PLL circuit is not in a locked state, the independently generated clock signal is used, and the processing circuit outputs data substantially at zero level, whereby the recording of noises on the magnetic tape is prevented.

REFERENCES:
patent: 4040022 (1977-08-01), Takii
patent: 4785361 (1988-11-01), Brotby

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