G - Physics – 11 – C
Patent
G - Physics
11
C
354/108, 354/223
G11C 8/00 (2006.01) G11B 20/14 (2006.01) H04L 25/49 (2006.01)
Patent
CA 1095166
PHN. 8407. ABSTRACT: The invention provides a coding and decoding system for use with a medium having a bivalent state, for example, a magnetisation direction. Information bits can be received without restriction on an input. The information bits are grouped to form information words of eight bits which are translated to code words of nine bits. The translation is so that no more than two code bits of which none would imply a state transition in the medium directly succeed each other. In the case of a high storage density of means on the receive of the read side, for example, a Nyquist-II filter. In order to enable the said restriction to be maintained also between successive code words, a bit is inserted by a keying device on the transmission side between each pair of successive code words, the said bit implying a state transition in the medium. This bit is extracted again on the receive side. A code conversion is thus realised with a coding efficiency of 80%, for which a limited code alphabet suffices. Resynchronisation can be effected with a high accuracy on the basis of the quickly recur- ring transition instants.
278802
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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