Line impairment display for digital modems

Details Line impairment display for digital modems Line impairment display for digital modems

1985-04-11

1987-01-27

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 39, 375 51, H04B 346

Patent

active

046399348

ABSTRACT:
A modem receiver used in a QAM or PSK data communication system is provided with various circuits generating error or monitoring signals indicative of the status of the system. These signals and the in-phase and quadrature components of the received signals are fed to an interface circuit which generates display signals suitable for driving a display unit such as an oscilloscope. These display signals define an image composed of the signal constellation of the received signals and various error or monitoring points.

REFERENCES:
patent: 4273955 (1981-06-01), Armstrong
patent: 4351059 (1982-09-01), Gregoire et al.
patent: 4377822 (1983-03-01), Noirel et al.
patent: 4381546 (1983-04-01), Armstrong
patent: 4516216 (1985-05-01), Armstrong
patent: 4532640 (1985-07-01), Bremer et al.
patent: 4534026 (1985-08-01), Martinez et al.
patent: 4534036 (1985-08-01), Betts et al.
patent: 4541100 (1985-09-01), Sutton et al.

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