Telephone line interface

Details Telephone line interface Telephone line interface

1982-09-13

1984-12-18

Safourek, Benedict V.

Weighing scales

Preset

Spring support

179 81R, 330 10, 375 8, 375 22, H03K 708, H04B 320

Patent

active

044892225

ABSTRACT:
A telephone line interface which performs the BORSHT functions employs pulse width modulation and eliminates dc in the transformer to reduce the size of the coupling transformer thereby reducing space and costs. The ring function is provided to the subscriber without use of mechanical relays. An automatic, dynamically adjusted hybrid network is provided for removing echo signals thereby providing major improvement in two-to-four wire conversion performance. The circuitry lends itself to large scale integration thereby reducing space and cost and improving reliability.

REFERENCES:
patent: 3471651 (1969-10-01), Saia et al.
patent: 3965447 (1976-06-01), Thomas
patent: 4317964 (1982-03-01), Biggs et al.
patent: 4337438 (1982-06-01), Guggenbuhl et al.

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