Matsushita Electric Industrial Co., Ltd.

Seiki Yokozeki

Masayuki Arai

Keiichi Iiyama

Jun Nomura

Itsuo Takamiya

Akihisa Yamazaki

A data transmission and reception system according to this invention comprises a transmitter for transmitting data by modulating transmit data and a receiver for receiving and demodulating a signal from the receiver, wherein the receiver includes a parallel resonator for receiving a PSK signal; a full rectification circuit for detecting output from the parallel resonator; a low pass filter for shaping the waveform of output from the full rectification circuit; and a comparator for converting output from the low pass filter into a binary-coded signal so that demodulated signals can be obtained from the output of the comparator. Therefore, PSK signals can be demodulated without a PLL or a tank circuit, the overall system consumes a smaller amount of power and is thin and reliable, the transmitter has an amplifier that can operate efficiently, particularly with a limited power supply as in IC cards or a single power supply used for portable terminals, and the receiver is reliable even with a simple circuit using a communication method that locally suppresses the amplitude at phase change points to remove an oscillation circuit in order to reduce the size and thickness of the device.

Data transmission and reception system

Power and time controlled high frequency heating appliance

Method for operating a programmable microwave heating apparatus with

A heating control apparatus includes a vapor sensor for detecting the vapor liberated from the food to be cooked and a microcomputer for controlling the heating sequence in response to a signal from the vapor sensor for automatic heating control suitable for the food. The time T.sub.1 from the heating start to the detection by the vapor sensor of the vapor liberated from the food is counted by the microcomputer. A constant K determined according to the type of food which is determined by cooking tests in advance and which is stored in the microcomputer is selected in connection with the time T.sub.1. The time T.sub.1 is multiplied by the selected constant K to determine the time T.sub.2 from the detection of vapor by the vapor sensor to the end of cooking by heating. The food heating sequence is controlled by the microcomputer, especially, utilizing the facts that the time T.sub.1 is proportional to the volume of the food of the same type and that the constant K is not fixed for the same food but varies with the volume thereof.

Heating control apparatus for cooking oven with vapor sensor

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Yamatokoriyama, Japan

Seiki Yokozeki