Non-interruptive spectrum analyzer for digital modems

Details Non-interruptive spectrum analyzer for digital modems Non-interruptive spectrum analyzer for digital modems

1988-01-04

1988-09-13

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 77H, G01R 2316

Patent

active

047712325

ABSTRACT:
A system and method are provided which allow a user to obtain a plot of the amplitude response of a channel such as a telephone line in the band occupied by a modem signal without interrupting or affecting the data traffic through the modem. No test tones are required for M.sub.e spectral measurements, i.e., the system extracts spectral data from the actual received modem signal that has been shaped by the amplitude characteristics of the line. The amplitude characteristics are displayed on an external oscilloscope using a modem eye pattern display.

REFERENCES:
patent: 3836735 (1974-09-01), Bradley
patent: 3985980 (1976-10-01), Bradley
patent: 4093989 (1978-06-01), Flink et al.
patent: 4451782 (1984-05-01), Ashida

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