Signal transmitting system including A-D and D-A converters

Details Signal transmitting system including A-D and D-A converters Signal transmitting system including A-D and D-A converters

1974-11-18

1976-04-06

Safourek, Benedict V.

Telegraphy

Systems

Line-clearing and circuit maintenance

178DIG3, 178 68, 340347AD, H03K 1302

Patent

active

039491706

ABSTRACT:
A signal transmitting system including an A-D converter for converting an analog input signal to a digital signal and a D-A converter for re-converting the digital signal to an analog output signal is provided with improved fidelity without increasing the number of digital levels and digital bits in the A-D and D-A converters. In such signal transmitting system, the analog input signal is applied to a plurality of voltage level comparators for comparison therein with respective reference voltages which sequentially differ from each other by predetermined voltage increments, the levels of the reference voltages are periodically varied by means of a switching signal, outputs from the level comparators are applied to an encoder which produces a corresponding digital signal, a decoder receives the digital signal and reconverts the latter to an analog signal, and the analog signal from the decoder is added to a switching signal which may be the first mentioned switching signal, or at least has the same period as the latter, to provide a resulting analog output signal which relatively closely corresponds to the analog input signal.

REFERENCES:
patent: 3244808 (1966-04-01), Roberts
patent: 3562420 (1971-02-01), Thompson
patent: 3699446 (1972-10-01), Sainte-Beuve
patent: 3739082 (1973-06-01), Lippel

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