Generating quasi-random sequences in AMI code

Details Generating quasi-random sequences in AMI code Generating quasi-random sequences in AMI code

1983-06-03

1985-03-26

LaRoche, Eugene R.

Oscillators

Electrical noise or random wave generator

364717, 375 17, 375 20, 307269, H03B 2900

Patent

active

045076219

ABSTRACT:
In order to test coding rule infraction test units for AMI code which are employed for surveillance of digital transmission circuits, an arrangement is provided which generates quasi-random sequences in the AMI code without employing a spur line short-circuited at its end. Previously, no coding rule infractions could be mixed into the generated signals with such a spur line usually employed for generating signals in the AMI code. With the disclosed arrangement a generator for binary quasi-random sequences is provided to whose output one input of a differential amplifier arrangement is directly connected. Another input of the differential amplifier arrangement is connected via a series connection of an exclusive OR element and a time-delay element. Noise pulses which lead to coding rule infractions in the generated output signals can be mixed in via the other input of the exclusive OR element.

REFERENCES:
patent: 3965294 (1976-06-01), Renz et al.
patent: 4071692 (1978-01-01), Weir et al.
patent: 4423518 (1983-12-01), Hirosaki

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