Low redundancy recording and/or playback systems

Details Low redundancy recording and/or playback systems Low redundancy recording and/or playback systems

G - Physics

11

B

354/108, 352/19.

G11B 27/10 (2006.01) G11B 20/14 (2006.01)

Patent

CA 1051116

ABSTRACT OF THE DISCLOSURE A magnetic recording and reproducing system wherein a parallel four-bit input code is converted into a five-bit char- acter code and magnetically recorded. The code has a low re- dundancy when recorded with a magnetic state changing only for each zero bit. As a result, the magnetic recording has a high- bit density. Upon reading the magnetic recording, the zero- bit pulses are employed to synchronize a phase lock oscillator, enabling self-clocking as in the Manchester recording system. The recorded five-bit code is recovered by applying the read pulses and the phase lock oscillator output to logic circuits including flip-flops and gates. The five serial bit character is parallelized and decoded to recover the original five-bit code.

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