Off-hook disconnect and reconnect ringer device

Details Off-hook disconnect and reconnect ringer device Off-hook disconnect and reconnect ringer device

1995-09-05

1997-03-18

Matar, Ahmad F.

Telephonic communications

Substation or terminal circuitry

Hold circuit

379 32, 379373, 379377, 379387, H04M 314, H04M 124

Patent

active

056129971

ABSTRACT:
An off-hook disconnect and reconnect ringer device will detect if a telephone is off-hook and will receive incoming telephone calls through the off-hook telephone. The off-hook disconnect and reconnect ringer device includes at least one relay, an audio amplifier or first transistor, a switch or second transistor, a timer, a first comparator, a second comparator, a relay driver or third transistor, and a ringer device. The off-hook disconnect and reconnect ringer device may be integrally formed with the telephone or may be connected to the telephone by at least one wire. During operation of the device, if an audio signal is not detected, then the timer is actuated and begins to time the period of time that the telephone is off-hook. After a preset period of time, the relay temporarily disconnects the telephone from the telephone line, allowing the off-hook disconnect and reconnect ringer device to signal through the ringer device that an incoming call is being received, even though the telephone is off-hook. The first comparator detects voltage for enabling the telephone to be reset for normal usage of the telephone. The off-hook disconnect and reconnect ringer device may include a plurality of integrated circuits for detecting tones and a NOR gate. If the telephone is off-hook, when the off-hook disconnect and reconnect ringer device detects a tone produced by the telephone company, the telephone is disconnected from the telephone line. Incoming calls will activate the ringer device, signaling a person to answer the telephone.

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