Automatic alignment system for a digital modem

Details Automatic alignment system for a digital modem Automatic alignment system for a digital modem

1980-05-16

1982-05-25

Atkinson, Charles E.

Excavating

324 73R, 455226, 371 28, G01R 3128

Patent

active

043320295

ABSTRACT:
An automatic alignment system for use in a digital modem, having a performance indicator circuit associated therewith, adjusts the control voltages applied to selected alignment points therein in order to minimize the error indication output of the performance indicator circuit. The alignment system interfaces with a microprocessor and provides the necessary timing mechanism to generate write pulses which control the operation of respective processing circuits associated with the various alignment points in the modem analog unit. Each of the processing circuits in the modem analog unit includes a digital-to-analog converter, a data latch, and an amplifier which processes the output of the microprocessor interface to generate an analog control voltage.

REFERENCES:
patent: 2978647 (1961-04-01), Lehmann
patent: 2978655 (1961-04-01), Fernsler
patent: 3622877 (1971-11-01), MacDavid et al.
patent: 3652938 (1972-03-01), Byers et al.
patent: 3842247 (1974-10-01), Anderson
patent: 3889255 (1975-06-01), Petterson
patent: 4197500 (1980-04-01), Klein et al.
patent: 4238779 (1980-12-01), Dickinson et al.

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