Transient signal elimination circuit for telecommunications appl

Details Transient signal elimination circuit for telecommunications appl Transient signal elimination circuit for telecommunications appl

1989-07-11

1990-12-25

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379106, 379 39, 3701101, H04M 1106

Patent

active

049809113

ABSTRACT:
Transient signal elimination circuitry is disposed in a local communications loop extending from a subscriber telephone to a telephone central office couples ringing and on-hook and off-hook signals through the loop after removing transients in these signals. The circuitry also isolates the telephone subscriber and central office from the local loop until an off-hook signal is detected and restores this isolation when an on-hook condition exists at the telephone subscriber. Transient signal elimination is accomplished with a CPU driven interface which detects undesirable transients such as a ringing or off-hook signal, and in response thereto generates a burst of double tone signal to alert connected equipment. In this manner, the local loop can be simultaneously used for both voice communications and a second information signal with each signal capable of occupying the same bandwidth. These signals can operate independently of each other.

REFERENCES:
patent: 4086234 (1978-04-01), Bocchi
patent: 4493948 (1985-01-01), Sues et al.
patent: 4528422 (1985-07-01), Cupani
patent: 4665516 (1987-05-01), Middleton et al.
patent: 4872198 (1988-08-01), Sues et al.

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