Method and apparatus for scrambled pulse-code modulation transmi

Details Method and apparatus for scrambled pulse-code modulation transmi Method and apparatus for scrambled pulse-code modulation transmi

1982-09-14

1985-08-06

Orsino, Jr., Joseph A.

Pulse or digital communications

Repeaters

Testing

178 2204, 178 2206, H04K 106, H04N 716

Patent

active

045340374

ABSTRACT:
In order to emphasize particular spectral components of a sequence of digital signals transmitted or recorded in pulse-code words, "repacketed" words made up of one or more bits of one word of the original sequence and a complimentary number of bits from the next word are produced to provide a new series of words. The bits of alternate words are inverted before repacketing so that according to whether the alternation of bits in the new word is by bits, pairs of bits or quartets of bits in 8-bit words, for example, the quadruple sampling frequency, the double sampling frequency or the sampling frequency itself can be emphasized in the spectrum. Without the inverting of alternate words it is possible to transform the frequency spectrum downwards in frequency.

REFERENCES:
patent: 3970790 (1976-07-01), Guanella
patent: 4168396 (1979-09-01), Best

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