Multiplex communications – Wide area network – Packet switching
Patent
1978-01-16
1983-05-24
Stewart, David L.
Multiplex communications
Wide area network
Packet switching
370 9, H04J 600, H04J 1300
Patent
active
043853773
ABSTRACT:
A device for sample modulating electronic information signals, which includes a pulse position modulating circuit having a first input coupled to receive information signals, a second input coupled to simultaneously receive uniformly spaced sampling signals, and an output for generating thereon in response to each sampling signal an electronic output impulse at a time instant indicating the amplitude of the simultaneously received information signals. Also included is an acoustic surface wave device having an impulse response of predetermined shape and finite length. The surface wave device has an input coupled to receive the impulses from the pulse position modulating circuit for generating in response thereto output signals proportional to the convolution of the impulses with the impulse response. Accordingly, these output signals also are of predetermined shape and finite length, and thus have a highly controllable frequency spectrum.
REFERENCES:
patent: 2861257 (1958-11-01), Weintraub
patent: 3239761 (1966-03-01), Godde
patent: 3663899 (1972-05-01), Dieulesaint
patent: 3803395 (1974-04-01), Quate
patent: 3985968 (1976-10-01), Stelzenmuller
patent: 4055758 (1977-10-01), Stern
Transmission Systems for Communications; Staff, Bell Telephone Laboratories; Copyright, 1970; pp. 116,117.
Digital Communications, RCA Institutes, Copyright 1968; pp. 119-122 and 124-125.
Hartmann Clinton S.
Norris Jerry L.
Comfort James T.
Hiller William E.
Sharp Melvin
Stewart David L.
Texas Instruments Incorporated
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