Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1976-09-01
1978-01-03
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
360 29, G11B 509, G11B 502
Patent
active
040670503
ABSTRACT:
Clock and binary NRZ signals are derived from a data track of a magnetic tape. The data track includes a pattern having a substantially constant wave length of magnetic flux variations along its length. The variations are in the form of a carrier wave having only three predetermined envelope levels. One of the levels is provided for clock pulses and the other two levels are provided for the magnitudes of the binary NRZ signals. A replica of the variations is transduced by a head into an electrical signal. First and second signals are derived in response to the electric signal to respectively indicate the carrier wave having amplitudes above first and second values of the levels. The first level is greater than the level of one of the binary signals, while the second level is greater than the first level and the level of the clock pulses. In response to the first and second signals, flip-flop circuitry derives an NRZ signal, and the clock signal is derived in response to a predetermined common level for the first and second signals. The medium is susceptible to being driven at different speed ranges, and to this end, a signal indicative of a tape speed range is derived. Retriggerable one shots are selectively enabled, depending upon the speed range. The one shots which are enabled have time periods such that they are retriggered by the first and second signals while the medium is moving in a speed range associated with enablement of the particular retriggerable one shots.
REFERENCES:
patent: 3218618 (1965-11-01), Warren
patent: 3573766 (1971-04-01), Perkins, Jr.
patent: 3588836 (1971-06-01), Frazier, Jr.
patent: 3732364 (1973-05-01), Terada
patent: 3765005 (1973-10-01), Cannon
Canney Vincent P.
Cincinnati Electronics Corporation
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