Patent ID: 6900423
Filing Date: 2005-05-31
Classification: H05B

Abstract:
1. A control unit of a microwave oven, comprising: a Reduced Instruction Set Computer (RISC) microprocessor that carries out a digital signal processing function including a voice recognition function, a reproduction function of a compressed audio file, and an image compressing function; a soft touch panel in which electrostatic capacity varies depending upon touched positions; and a soft touch panel drive circuit to detect the variation of the electrostatic capacity of the soft touch panel to generate an electrical signal in response to the variation of the electrostatic capacity and to provide the electrical signal to the microprocessor; wherein the soft touch panel drive circuit comprising: an electrostatic capacity detection unit to detect the variation of the electrostatic capacity which is generated when the soft touch panel is touched, and to output an electrical sense signal in response to the variation of the electrostatic capacity and a reference signal in a rectangular waveform.