An IR keyboard 1 generates key code information corresponding to key operated to add break flag information indicating distinction between in-operation and operation release to the key code information as operation status information of the key to add terminator code information indicating that the key...http://www.google.com.tw/patents/US6031470?utm_source=gb-gplus-share專利 US6031470 - Method and device for transmitting key operation information and transmission-reception system
