SPATIAL DIVISION INFRARED COMMUNICATION SYSTEM

• Main Author: UMEMURA MASAYA
• Format: Patent
• Language: English
• Published: 24.06.2004
• Edition: 7
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION; SELECTING; TRANSMISSION

PROBLEM TO BE SOLVED: To solve the problem that an infrared photodetector 2 of a conventional household electrical appliance uses a single-device image sensor having no directivity and does not function as expected even though it acquires electrical signals 40 when a plurality of infrared remote controllers simultaneously send signals but cannot separate them into individual signals. SOLUTION: A CMOS image sensor having several hundreds of thousands of pixels is used in place of the infrared photodetector 2 of the household electrical appliances. A microprocessor 3 in the household electrical appliance uses the pixel of the CMOS image sensor for which a red filter is installed, detects non-natural light i.e. a signal that is high in brightness and whose pulse is modulated from a photographed image and demodulates the signal into data. When a plurality of the non-natural light, i.e. signals are detected in the photographed image, the microprocessor independently demodulates the signals by each photodetecting device that has detected the signals or by each photodetecting device group, and conducts spatial division infrared communication. COPYRIGHT: (C)2004,JPO