Method to apply and disconnect a 16 KHz signal to a telephone li

Details Method to apply and disconnect a 16 KHz signal to a telephone li Method to apply and disconnect a 16 KHz signal to a telephone li

1976-05-03

1977-07-12

Claffy, Kathleen H.

H04M 1512

Patent

active

040355837

ABSTRACT:
A tone generator which is always connected across a line and which can gradually increase or decrease its output amplitude. This is accomplished by the use of a tickler winding type of oscillator with a resonant frequency determining network connected to one winding. The frequency determining network is arranged with a high resistance shunt that is further shunted when the tone is to be removed.

REFERENCES:
patent: 3089000 (1963-05-01), Burgener
patent: 3156883 (1964-11-01), Wells
patent: 3456083 (1969-07-01), Van der Veen

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