Patent
1943-10-04
1976-11-09
Farley, Richard A.
179 15R, H04K 104
Patent
active
039912736
ABSTRACT:
1. In a secret telephone transmission system in which speech waves are analyzed into component speech-defining low frequency signals which are coded in stepped wave form, a group of frequency modulators of the same type and same average frequency, means to impress said signals of stepped wave form on the respective frequency modulators to produce a plurality of frequency modulated waves of the same average frequency, and means to translate said last waves into frequency modulated waves accurately positioned at different frequency levels comprising a separate amplitude modulator for shifting the frequency of each such frequency modulated wave, and means to supply to said amplitude modulators carrier waves of accurately spaced frequency comprising a source of base frequency waves of highly constant frequency and a harmonic generator for fixing the frequencies of said supplied carrier waves.
REFERENCES:
patent: 1447204 (1923-03-01), Espenschied
patent: 1565521 (1925-12-01), Stone et al.
patent: 1629685 (1927-05-01), Ditcham
patent: 1819508 (1931-08-01), Hansell
patent: 2103847 (1937-12-01), Hansell
patent: 2233183 (1941-02-01), Roder
patent: 2270385 (1942-01-01), Skillman
Bell Telephone Laboratories Incorporated
Birmiel H. A.
Burgess H. A.
Farley Richard A.
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