Subscriber circuit capable of suppressing in-phase induced noise

Details Subscriber circuit capable of suppressing in-phase induced noise Subscriber circuit capable of suppressing in-phase induced noise

1990-08-14

1992-12-15

Dwyer, James L.

Telephonic communications

Transmission line conditioning

Interference suppression

H04M 176

Patent

active

051724120

ABSTRACT:
A subscriber circuit has, in a subscriber line section thereof an in-phase induced noise suppressing circuit which is made up of two series connections of a capacitor and a non-linear element. When an intermittent high-voltage signal is being propagated on another subscriber loop, the noise suppressing circuit suppresses it to thereby prevent it from being transmitted to terminal equipment as noise. Since the degree of suppression of the in-phase induced noise can be limited as desired, the subscriber circuit is advantageously applicable to terminal equipment or line equipment having a line interface implemented as an LSI integrated circuit.

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Paul Horowitz et al., "The Art of Electronics," 2nd Ed. (1989), pp. 49-52.
"LSI For Telephone Subscriber Line Interface Now In A Practical Stage", Nikkei Electronics, May 10th, 1982, pp. 127-148.

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