Touch switch arrangement useful in a television receiver

Details Touch switch arrangement useful in a television receiver Touch switch arrangement useful in a television receiver

1979-03-19

1981-04-21

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

307116, 200DIG1, H04N 544

Patent

active

042636183

ABSTRACT:
User control apparatus for controlled systems includes a touch sensitive capacitive network for changing the amplitude of an alternating signal when contacted by a user and a control unit for controlling a predetermined function of the controlled system in response to a control signal representing amplitude changes of the alternating signal. A diode is connected in series between the touch sensitive capacitive network and wiring for connecting the touch sensitive capacitive network to the control unit. A filter capacitor is connected in shunt with the diode. The diode is poled to charge the filter capacitor to the peak amplitude of a predetermined portion of the alternating signal and also isolates the touch sensitive network from the capacitance of the filter capacitor and any stray capacitance associated with the wiring which may adversely affect the sensitivity of the touch sensitive capacitive network. When utilized in a television receiver, the alternating signals advantageously comprise pulses generated during deflection retrace intervals when the receiver's electron beams are normally blanked to reduce the visible effects of signals radiated from wiring between the source of alternating signals and the touch sensitive capacitive network.

REFERENCES:
patent: 4002923 (1977-01-01), Larson
patent: 4110748 (1978-08-01), Marino
patent: 4125783 (1978-11-01), Sefton
patent: 4125794 (1978-11-01), Pohl
patent: 4136291 (1979-01-01), Waldron
patent: 4176575 (1979-12-01), Munch
"Advanced Product Description-S9260/S9261/S9263/S9264/S9265 Touch Control Interface" AMI, Inc. Sep. 1976.
"Advanced Product Description-S9262/S9266 Multiplexed Touch Control Interface" AMI, Inc. Sep. 1976.

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