Method and apparatus for modulating and demodulating data...

Details Method and apparatus for modulating and demodulating data... Method and apparatus for modulating and demodulating data...

2007-10-16

2007-10-16

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Pulse code modulation

Length coding

C341S058000, C341S059000

Reexamination Certificate

active

11525484

ABSTRACT:
A digital sync signal added in a modulator to a train of codes having a digital sum value, and detected in a demodulator. The digital sync signal has a pattern that breaks a maximum run and a pattern that preserves a minimum run and a maximum run. The digital sync signal has a bit that is selectively determined to be a “0” or a “1” for controlling the digital sum value of the train of codes. The minimum run is repeated no more than a predetermined number of times irrespective of whether the digital sync signal includes the minimum run.

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