Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1976-03-19
1977-05-31
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
G11B 509
Patent
active
040273350
ABSTRACT:
A method and apparatus provide for the elimination of any net DC component from the transmission of binary data sequentially in successive clocked bit cells of a transmission channel wherein logical first bit states, e.g., 0's are normally transmitted as signal transitions relatively early in respective bit cells, preferably at cell edge, and logical second bit states, e.g., 1's are normally transmitted as signal transitions relatively late in respective bit cells, preferably at mid-cell, and any transition relatively early in a bit cell following a transition relatively late in the next preceding bit cell is suppressed. The onset of a sequence of second bit states following a first bit state that might introduce a DC component into the transmitted signal with normal transmission is detected by producing a first indicating signal, and in response to the first indicating signal and the state of a current bit and the state of the next succeeding bit the transmission of signal transitions is modified to eliminate any DC component. Preferably, the end of a sequence of second bit states that would introduce a DC component is detected by producing a second indicating signal utilized to modify the signal transitions at the end of a troublesome sequence, as by suppressing the transition corresponding to the last second bit state in such a sequence.
REFERENCES:
patent: 3622894 (1971-11-01), Heidecker et al.
patent: 3810111 (1974-05-01), Parel
patent: 3838448 (1974-09-01), Garbe et al.
patent: 3855616 (1974-12-01), Schneider
Ampex Corporation
Canney Vincent P.
LandOfFree
DC free encoding for data transmission 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 DC free encoding for data transmission system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DC free encoding for data transmission system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-662652