Telephonic communications – Call signal generating
Patent
1988-12-16
1990-05-08
Dwyer, James L.
Telephonic communications
Call signal generating
379253, H04M 302
Patent
active
049245112
ABSTRACT:
A programmable ring signal generator includes a source of a user control signal. A controlled clock signal generator produces one of a set of respective clock signals responsive to the user control signal. A switched capacitor filter is coupled to the clock signal generator for converting the clock signals to an analog sine-wave. Finally, a power amplifier, coupled to the sine-wave converter, produces the ring signal.
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Burns Robert V.
Gupta Sanjay
Caracappa David N.
Dwyer James L.
Siemens Transmission Systems, Inc.
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