Dynamic magnetic information storage or retrieval – Recording or reproducing an information signal and a control...
Patent
1981-03-12
1982-10-05
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Recording or reproducing an information signal and a control...
360 28, 360 30, G11B 502, G11B 504
Patent
active
043530990
ABSTRACT:
A method and apparatus for recovering analog signal information from a multiple-track information storage medium such as a magnetic tape is based upon time base error correction of a frequency modulated carrier signal. In one embodiment, the phase difference of a pair of pilot signals recorded on tracks adjacent a data track is compared by a sampling and pulse counting technique to eventually produce a trigger signal for a phase-locked oscillator. The output of the phase-locked oscillator is employed to sample and measure the period of the input data signal. The period values are written as digital values into a digital first-in first-out buffer memory. A stable clock is used to read out the contents of the buffer memory which are thereafter converted to a pulse rate modulated pulse train. The pulse train is converted to a useable analog signal by a pulse rate to frequency converter. In other embodiments, the phase error between the pilot signals is compared with a stable reference from which a skew error signal is derived to which the phase-locked oscillator is locked. In still other embodiments, a pilot signal is derived from the data track and employed to synchronize the sampling process to the rate of data input.
REFERENCES:
patent: 3483540 (1969-12-01), Damron
patent: 4054921 (1977-10-01), Tarami
Peterson John J.
Shum Edward K.
Canney Vincent P.
Precision Data, Inc.
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