Ringing signal generator
AssigneeGTE Automatic Electric Labs Inc.
InventorsJohn A. Gauthier, David M. Shaver
Life of this patent
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Abstract
A telephone ringing signal generator which sequentially produces a plurality of ringing signals each of a different frequency. Each of a plurality of tone ringers connected to the generator will ring only in response to it's particular frequency. A programmable oscillator generates the required frequencies under control of a time slot generator which defines the time slot during which each frequency is to be generated.
Claims11
A ringing signal generator for use in a telephone communication system connectable to a plurality of telephone substations including at least a first substation responsive to a first ringing signal frequency and a second substation responsive to a second substation ringing signal frequency, said ringing signal generator comprising:
- pulsing means operated to generate a plurality of periodic timing signals;
- first gating means connected to said pulsing means operated in response to selected timing signals to generate a first plurality of enable signals;
- and
- oscillation means;
- a plurality of frequency determining means;
- a plurality of first switching means connected between said oscillation means and said plurality of frequency determining means and also connected to said first gating means;
- said first plurality of switching means operated in response to each of said first plurality of enable signals to connect a predetermined one of said plurality of frequency determining means to said oscillation means;
- and
- said oscillation means operated to generate a signal of a predetermined frequency in response to being connected to said one of said plurality of frequency determining means.
Dependencies are inferred from the claim text.