Telegraphy – Systems – Printing
Patent
1981-12-08
1984-05-22
Cangialosi, Sal
Telegraphy
Systems
Printing
178 2214, 178 2219, 364717, H04R 300
Patent
active
044503210
ABSTRACT:
An apparatus and circuit is disclosed for the generation of a masking sound noise by which unwanted noise may be overcome without undue and unwanted sound levels. The apparatus and circuits have at least two multi-stage shift registers in which the last register sends an input signal to a first exclusive OR gate and to this same OR gate an intermediate connection to the shift register is made. The output from this first OR gate is sent to the first stage of the register and this same signal is sent as an output to a second exclusive OR gate. Each shift of each register is pulsed by an asynchronous clock. A second exclusive OR gate receives the output signals from each of the first OR gates and sends the output signal to a divide-by-counter and the output therefrom is sent to amplifying means and one or more speakers.
REFERENCES:
patent: 3639690 (1972-02-01), Braun et al.
patent: 3681708 (1972-08-01), Olmstead
patent: 3885139 (1975-05-01), Hurd
patent: 4054751 (1977-10-01), Calder et al.
patent: 4109856 (1978-08-01), van Beveren et al.
patent: 4325129 (1982-04-01), Groth
Electronics (11/8/78) pp. 134-136 Anderson.
Electronic Design (3/31/81) pp. 196,198.
Nelson Philip H.
Quigley William D.
Cangialosi Sal
Roberts Ralph R.
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