Ringer circuit, particularly for a telephone set

Details Ringer circuit, particularly for a telephone set Ringer circuit, particularly for a telephone set

1993-06-16

1994-06-21

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379390, 379395, 379418, H04M 100

Patent

active

053234553

ABSTRACT:
The ringer comprises a loudspeaker receiving signals from an amplifier, the amplifier having both a power supply input connected to a ringer line providing a ringer signal via a chopper power supply means, and a melody input which is connected to the ringer line via a regulation unit that provides an image signal representative of the power of the ringer signal, and via a transformation unit that transforms the image signal by means of a melody signal applied to a terminal.

REFERENCES:
patent: 4233474 (1980-11-01), Hishinuma
patent: 4251689 (1981-02-01), Hastings-James
patent: 4304969 (1981-12-01), Walla
patent: 4309574 (1982-05-01), Sublette et al.
patent: 4750203 (1988-06-01), Defretin
patent: 4827503 (1989-05-01), Takato et al.
patent: 5099513 (1992-03-01), Kim et al.

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