Electronic tone ringer for telephone sets

Details Electronic tone ringer for telephone sets Electronic tone ringer for telephone sets

1978-06-16

1980-02-19

Konick, Bernard

H04M 126

Patent

active

041896262

ABSTRACT:
A tone ringer for a telephone set, responsive to both low-voltage call signals of relatively high frequency and high-voltage call signals of a relatively low frequency, comprises an active filter connected across a line loop for transmitting the low-frequency call signals in attenuated form and the high-frequency call signals in amplified form to a storage capacitor in a signal detector which in the presence of either type of call signal accumulates a sufficient charge to activate a threshold circuit in that detector. A normally blocked current source, connected across the line loop via a diode bridge, is unblocked by this threshold circuit to energize a tone generator working into an electro-acoustic transducer.

REFERENCES:
patent: 3603740 (1971-09-01), Cambridge
patent: 3808379 (1974-04-01), Lind
patent: 4042786 (1977-08-01), Freimanis

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