Dialing confirmation tone output apparatus

Details Dialing confirmation tone output apparatus Dialing confirmation tone output apparatus

1989-10-02

1992-07-07

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379373, 379418, 379387, H04M 126

Patent

active

051289911

ABSTRACT:
A dialing confirmation tone (DCT) output apparatus including a variable attenuator connected between a DCT generator and an adder adding a received voice signal and a dialing confirmation tone. The attenuator attenuates the confirmation tone based on a control signal from a control circuit. The control circuit produces the control signal using a conversation condition signal and a receiving situation signal. The conversation condition signal is provided from a conversation condition detector and indicates whether conversation is taking place or not. The receiving situation signal is provided from an earphone jack circuit and indicates whether or not an earphone is used for outputting the added signal. The attenuated confirmation tone can be heard while conversation takes place or the earphone is used.

REFERENCES:
patent: 4406926 (1983-09-01), Duncan
patent: 4442322 (1984-04-01), Grantland
patent: 4496799 (1985-01-01), Kingen et al.
patent: 4508938 (1985-04-01), Berch et al.

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