Code expansion generator

Details Code expansion generator Code expansion generator

1983-06-22

1985-07-16

Dobeck, B.

Communications: electrical

Audible indication

Percussion-type sound producer

375 25, 307234, H03K 1324

Patent

active

045299633

ABSTRACT:
Method and apparatus for generating and utilizing a pair of expanded multiplexed noise codes from multi-bit code mate pairs having code bits of equal pulse width by first reducing the pulse width of each of the original code bits of both code mates by one half to form a pair of intermediate code mates having code bits of one half the pulse width of the original code bits. One of the intermediate codes is delayed by a time equal to at least three times the pulse width of the intermediate code bits after which it is added to the other intermediate code mate to form a first partially interleaved code mate, while a second partially interleaved code mate is generated by subtracting the delayed intermediate code mate from the other intermediate code mate and effected, for example, by forming the negative of the delayed intermediate code mate and adding it to the other intermediate code mate. The resulting partially interleaved code mates compress to an impulse when they are detected with their respective matched filters and linearly added.

REFERENCES:
patent: 3461451 (1967-09-01), Gutleber
patent: 4232388 (1980-11-01), Isailovic
patent: 4293953 (1981-10-01), Gutleber
patent: 4307381 (1981-12-01), Isailovic
patent: 4455662 (1984-06-01), Gutleber
patent: 4471342 (1984-09-01), Gutleber
patent: 4497068 (1985-01-01), Fischer

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