Capacitive touch detection

Details Capacitive touch detection Capacitive touch detection

1998-01-27

2000-07-25

Lee, Ping

Electrical audio signal processing systems and devices

With mixer

H04B 100

Patent

active

060944919

ABSTRACT:
A capacitive touch detection system, which can be used to inhibit motorized faders in an audio mixing system, includes touch detection circuits each having a respective conductive area for touch determination by detection of increased capacitance at the conductive area. The touch detection circuits are operable during predetermined active periods initiated by a clock generator which activates a pulse generator to produce an enable pulse EP1 for one detection circuit. The trailing edge of that enable pulse EP1 generates a non-overlapping enable pulse EP2 for the next detection circuit, and the process continues so that no more than one detection circuit is active at any time. This minimizes interaction between detection circuits if more than one conductive area is touched simultaneously.

REFERENCES:
patent: 4291303 (1981-09-01), Cutler et al.
patent: 4550310 (1985-10-01), Yamaguchi et al.
patent: 5293102 (1994-03-01), Martinson et al.

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