Code compressor for multilevel interleaved multiplexed noise cod

Details Code compressor for multilevel interleaved multiplexed noise cod Code compressor for multilevel interleaved multiplexed noise cod

1983-11-28

1985-04-16

Griffin, Robert L.

Communications: electrical

Audible indication

Percussion-type sound producer

375 34, 375 38, 375 17, 375 96, 370 18, H03K 1324

Patent

active

045118850

ABSTRACT:
Multilevel code mates A and B expanded in accordance with the expression a)I (b.sup.K) and B=(a.sup.K)I (b) are compressed to a lobeless basic mate pair by repeatedly compressing corresponding code mate pairs in successive stages to provide diminishing codes of half the number of code bits by amplifying the code mates by a predetermined amplification factor and then adding and subtracting the code mates in accordance with expressions A.sub.i-1 =A.sub.i +B.sub.i.sup.K.sbsp.i and B.sub.i-1 =A.sub.i.sup.K.sbsp.i -B.sub.i where i is the i.sub.th compression stage and K.sub.i is the amplification factor applied to the codes A.sub.i and B.sub.i.

REFERENCES:
patent: 3461451 (1969-08-01), Gutleber
patent: 3519746 (1970-07-01), Gutleber
patent: 3634765 (1972-01-01), Gutleber
patent: 4293953 (1981-10-01), Gutleber
patent: 4471342 (1984-09-01), Gutleber

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