초록 ▼

Disclosed herein is a system and method of serially transferring a sequence of data bits between a computer and a portable information device such as the Timex Data LinkTMwatch, using the CRT of the computer as a transmission medium. The computer is programmed to display sequential display frames on

Disclosed herein is a system and method of serially transferring a sequence of data bits between a computer and a portable information device such as the Timex Data LinkTMwatch, using the CRT of the computer as a transmission medium. The computer is programmed to display sequential display frames on a frame-scanning graphics display device and to illuminate line segments within the display frames to represent individual data bits. Each line segment has a continuous length on the display device which produces an optical pulse of a corresponding duration. Each data bit is encoded as a different line segment length to produce an optical pulse for each data bit having a duration which is dependent on the value of the data bit. For example, a pulse representing a binary value of 0 has a duration which is relatively longer than that of a pulse representing a binary 1. A receiving device monitors the optical signal created by the CRT and detects rising signal edges. It interprets each rising edge as the beginning of a single bit. After detecting a rising edge, the receiving device waits for a pre-determined time and then samples the optical signal. If the pulse from the CRT is still present, the receiving device interprets the data bit as a binary 0. Otherwise, the receiving device interprets the data bit as a binary 1.

대표청구항 ▼

A method of serially transferring a sequence of data units to a portable information device, each data unit having one of a plurality of possible values, the method comprising the following steps: displaying sequential display frames on a frame-scanning graphics display device; illuminating line seg

A method of serially transferring a sequence of data units to a portable information device, each data unit having one of a plurality of possible values, the method comprising the following steps: displaying sequential display frames on a frame-scanning graphics display device; illuminating line segments within the display frames to represent the individual data units, each such line segment having a continuous length on the display device which produces an optical pulse of a corresponding duration; encoding each possible data unit value as a different line segment length to produce an optical pulse for each data unit having a duration which is dependent on the value of the data unit.