Telephonic communications – Centralized switching system – With generating of call associated substation signal
Patent
1986-01-30
1987-10-27
Dwyer, James L.
Telephonic communications
Centralized switching system
With generating of call associated substation signal
379253, 379418, H04M 302
Patent
active
047035005
ABSTRACT:
A power amplifier includes negative and positive terminals for connection across a direct current supply, an input for receiving a reference signal and an output for supplying an amplified replica of the reference signal. Positive polarity and negative polarity energy transfer gates are controlled to store electrical energy from the direct current supply, and to subsequently release electrical energy to the output. A control circuit is responsive to the reference signal and a potential amplitude at the output, for controlling which of either or neither of the positive polarity and negative polarity energy gates is active, and for controlling each quantity of electrical energy stored by an active one of the energy gates so that the amplified replica of the reference signal is provided. In an example, the power amplifier is used to efficiently generate ringing battery signals for use in a telephone facility.
REFERENCES:
patent: 4284854 (1981-08-01), Hayward et al.
patent: 4349703 (1982-09-01), Chea, Jr.
patent: 4500844 (1985-02-01), Lisco
Dwyer James L.
Northern Telecom Limited
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