Bipolar with eight-zeros substitution and bipolar with six-zeros

Details Bipolar with eight-zeros substitution and bipolar with six-zeros Bipolar with eight-zeros substitution and bipolar with six-zeros

1988-03-11

1989-12-12

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from multi-level codes

371 56, 375 17, H03M 518

Patent

active

048870838

ABSTRACT:
A B8ZS.B6ZS coding circuit commonly used for a B8ZS coding or a B6ZS coding, generating a B8ZS violation signal or a B6ZS violation signal at a same start timing, and formed by a smaller circuit. The B8ZS.B6ZS coding circuit includes a first eight-bit shift register, receiving the input unipolar signal and shifting the same in response to a clock signal, the last two flip-flops in the shift register being reset under the B6ZS mode, a first gate outputting a first consecutive zero detection signal when all flip-flops in the first shift register are reset, a second seven-bit shift register, the last two flip-flops in the shift register being reset under the B6ZS mode, a second gate outputting a second consecutive zero detection signal when all flip-flops in the second shift register are reset, a third gate outputting an exclusive OR signal of the first and the second consecutive zeros detection signals, an inverter and outputting an inverted signal of the output from the third gate, a fourth gate receiving outputs from a sixth flip-flop in the first shift register, first, second, fourth and fifth flip-flops in the second shift register, and outputting a first original coded signal, and a fifth gate receiving outputs from the sixth flip-flop in the first shift register, the inverter, and the first, fourth and fifth flip-flops in the second shift register, and outputting a second original coded signal.

REFERENCES:
patent: 4747112 (1988-05-01), Blondeau et al.
patent: 4757501 (1988-07-01), Gorshe
patent: 4785466 (1988-11-01), Lee et al.

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