Tone modification system for telephone system with clock

Details Tone modification system for telephone system with clock Tone modification system for telephone system with clock

1990-04-10

1992-02-25

Dwyer, James L.

Telephonic communications

Call signal generating

379190, 379393, H04M 100

Patent

active

050919342

ABSTRACT:
A telephone system with a clock includes a circuit which produces a first tone indicating a connection of a transmission line is on hold or that a preset time has arrived, and a different time announcing tone for announcing the arrival of the preset time while the connection of the transmission line is on hold. When a calling tone is to be produced upon reception of the call while the time announcing tone is emitted, the telephone system with the clock produces the calling tone in a manner different from the time announcing tone. Thus, it is possible to be alerted to both the time announcing tone and the holding tone and both the time announcing tone and the calling tone when either combination is initiated at the same time.

REFERENCES:
patent: 4631361 (1986-12-01), Miller
patent: 4651339 (1987-03-01), Gibbs
patent: 4674118 (1987-06-01), Tosto
patent: 4834551 (1989-05-01), Katz
patent: 4866587 (1989-09-01), Wadlington

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