Digital modulator and demodulator

Details Digital modulator and demodulator Digital modulator and demodulator

1989-06-09

1991-05-14

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 55, 341 58, 341 95, 341102, H04L 1500, H03M 720

Patent

active

050162586

ABSTRACT:
A digital modulator converts M-bit data words to N-bit code words (N>M) each containing a specific number of bits `1`. The specific number is one of a plurality of predetermined numbers which are different by at least 3 from one another. A specific data word may be converted to either one of two code words having different numbers of bits `1` from each other so as to reduce DC components of a channel code constituted by the code words.

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patent: 4620311 (1986-10-01), Immink
patent: 4646281 (1987-02-01), Verboom et al.
patent: 4802154 (1989-01-01), Verboom et al.
patent: 4855742 (1989-08-01), Verboom
"Introduction to Digital Audio Recording", F. A. Bellis; The Radio and Electronic Engineer, vol. 53, No. 10, Oct. 1983, pp. 361-368.

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