| 摘要 |
A magnetic recording and reproducing system wherein a parallel four-bit input code is converted into a five-bit character code and magnetically recorded. The code has a low redundancy 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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