Dynamic magnetic information storage or retrieval – General processing of a digital signal – Pulse crowding correction
Patent
1984-10-09
1987-06-09
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Pulse crowding correction
360 51, G11B 509
Patent
active
046724826
ABSTRACT:
A digital apparatus recovers data recorded in FM or MFM on a magnetic media moving at a normal speed in which the reading of the media provides a sequence of timing/data pulses at variable intervals, which differ from a nominal interval due to speed error and magnetic "peak-shift". The apparatus provides identification of a nominal interval between read out pulses and the reconstruction of a correct stream of pulses properly located within a window signal. It includes a digital measurement unit which at each read out pulse n received in input supplies at an output a code indicative of the actual duration of the interval N between the pulse n and a previous pulse n-1; and a speed correction unit which corrects the measured duration of the interval N relative to speed error detected by the digital measurement unit during reading of a synchronization bit field. A peak shift correction unit included within the apparatus utilizing the corrected interval duration, and for MFM recording, the previous most recent history of received pulses establishes a nominal duration for the interval N. The nominal duration attributed to interval N is used by a regeneration unit to produce a suitable window signal and a regenerated pulse corresponding to the read out n pulse which is properly located within the window signal.
REFERENCES:
patent: 4547890 (1985-10-01), Gindi
Canney Vincent P.
Driscoll Faith F.
Honeywell Information Systems Italia
Solakian John S.
LandOfFree
Digital apparatus for magnetic media data recovery system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital apparatus for magnetic media data recovery system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital apparatus for magnetic media data recovery system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1833010