Method and apparatus for an improved ring trip detection telepho

Details Method and apparatus for an improved ring trip detection telepho Method and apparatus for an improved ring trip detection telepho

1984-11-21

1987-06-30

Brown, Thomas W.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379385, H04M 302

Patent

active

046776648

ABSTRACT:
A telephone circuit for ring trip detection that can be monolithically integrated, includes a current transducer coupled to a user's telephone line, and an integrator circuit. The output current of the current transducer is proportional to the line current until equal and opposite threshold values are reached. When the line current threshold values are exceeded, the transducer output current is constant. The transducer output current is integrated by the integrator circuit over at least one complete cycle. When a telephone headset is removed, a direct current is applied to the ringing signal current resulting in asymmetry in the half-cycles of the transducer output current. The asymmetry provides a non-zero integrated current for a complete cycle. When the integrated value of the asymmetrical current is greater than a selected value, a signal is applied to the ringing circuit, halting the ringing signal.

REFERENCES:
patent: 3829619 (1974-08-01), Close et al.
patent: 4110569 (1978-08-01), Schindler et al.
patent: 4355206 (1982-10-01), Israel et al.
patent: 4356355 (1982-10-01), Ferrieu et al.
patent: 4362908 (1982-12-01), Melindo
patent: 4396805 (1983-08-01), Wagner

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