Readback recovery of run length limited codes

Details Readback recovery of run length limited codes Readback recovery of run length limited codes

1988-04-15

1989-03-14

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

360 24, 360 361, H04B 166

Patent

active

048130591

ABSTRACT:
Run length limited codes, such as (1,7) codes are recovered with a dual channel recovery system in which the high resolution channel normally supplies the output (recovered) signal. The low resolution channel includes a detector, such as a delay device and gate, to detect a predetermined absence of transitions in the low resolution signal (which is indicative of long strings of successive zeros) to inhibit the high resolution channel from supplying the output. The result is to effectively block the high resolution channel from providing a false output.

REFERENCES:
patent: 3953802 (1976-04-01), Morris et al.
patent: 3988679 (1976-10-01), Clarke et al.
patent: 4291344 (1981-09-01), Kimura
patent: 4337458 (1982-06-01), Cohn et al.
patent: 4517610 (1985-05-01), Minuhin
patent: 4697098 (1987-09-01), Cloke
patent: 4706265 (1987-11-01), Furukawa

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