H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/23
H04M 1/272 (2006.01) H04M 1/50 (2006.01)
Patent
CA 1049670
MULTITONE PUSHBUTTON DIAL PHASE SHIFT SCANNING CIRCUITRY Abstract of the Disclosure In a multitone pushbutton dial array each switch in the array has a variable impedance coupling between a fixedly mounted conductive plate and a movable conductive plate spaced apart from the fixedly mounted plate. Digitally synthesized signals having a predetermined phase and frequency are sequentially and recurrently used to scan interconnected columns of movable plates in the pushbutton dial array. Signals having an opposite phase from the scanning signals are continuously applied to the fixedly mounted plates. When a pushbutton is depressed variable impedance coupled summation signals are produced and these signals have a phase which is opposite to that of signals coupled to the detector from an unoperated switch. The detected digital signals axe used to generate digital multitone row and column frequency signals. These digital row and column signals are converted to analog form and are transmitted to a telephone central offices as a dialed digit code.
252708
Na
Western Electric Company Incorporated
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