Telegraphy – Systems – Printing
Patent
1946-05-01
1976-01-20
Wilbur, M. R.
Telegraphy
Systems
Printing
179 15R, 331 78, H04L 904
Patent
active
039340783
ABSTRACT:
1. In a key pulse generating circuit for producing key pulses varying in amplitude in highly irregular manner, said pulses occurring at a given rate, means to generate high speed off-on pulses at a rate many times higher than said given rate in a plurality of separate paths, means to hold over certain of said off-on pulses into subsequent of said high speed pulse times, means to combine the pulses so held over with pulses subsequently generated in certain of said paths to form combination of said high speed pulses, and means to select and combine with one another to form one of the final key pulses occurring at said given rate, individual ones of said last-mentioned high speed pulses occurring at instants of time separated from one another by several of said high speed pulses while discarding the intervening high speed pulses.
6. A pulse producing system comprising an initial portion operating at high frequency and a subsequent portion operating at low frequency, means to generate irregularly occurring pulses at high frequency in said initial portion, means in said subsequent portion to produce low frequency pulses each having a time period great enough to include many successive high frequency pulse periods, including means for selecting from among said high frequency pulses a plurality of pulses all occurring at different non-overlapping times within one low frequency pulse period and separated from one another in time by a plurality of high frequency pulse periods, and means to combine each such plurality of selected pulses into a single resultant low frequency pulse in said subsequent portion of said system.
REFERENCES:
patent: 2284401 (1942-05-01), Manley
patent: 2289564 (1942-07-01), Wrathall
patent: 2395467 (1946-02-01), Deloraine
patent: 2406977 (1946-09-01), Wendt
patent: 2424998 (1947-08-01), Nyquist
patent: 2424999 (1947-08-01), Ostlund
patent: 2428149 (1947-09-01), Falk
patent: 2429471 (1947-10-01), Lord
patent: 2466044 (1949-04-01), Schoenfeld
Bell Telephone Laboratories Incorporated
Birmiel H. A.
Burgess H. A.
Wilbur M. R.
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