Distortion analyzer for quadrature demodulated data

Details Distortion analyzer for quadrature demodulated data Distortion analyzer for quadrature demodulated data

1984-11-09

1986-12-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 39, 364514, 371 22, H04B 346

Patent

active

046270710

ABSTRACT:
Method and apparatus for displaying measures of distortion present at the outputs of a quadrature demodulator. From each of the in-phase and quadrature channels of the demodulator there are acquired n parallel bits, m of these bits being the demodulator data output of the associated channel and (n-m) bits being error bits for the channel. The n bits for each channel are converted to a signal acceptable to a plot display device and applied to orthogonal axes of the device. In addition, an absolute value of the (n-m) error bits for each channel is derived. This absolute value is filtered and displayed, as by a meter, for each channel.

REFERENCES:
patent: 3689884 (1972-09-01), Tew, Jr.
patent: 4176317 (1979-11-01), Manfreda
patent: 4381546 (1983-04-01), Armstrong
patent: 4449223 (1984-05-01), Liskov et al.
patent: 4495585 (1985-01-01), Buckley

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