Patent ID: 7173948

Claim:
An optical transmission apparatus for use in an optical transmission/reception system in which an electric signal comprising a digital signal including at least a video signal and horizontal and vertical synchronous signals of the video signal is converted to a light signal and then transmitted and in which the light signal is received and converted to the electric signal comprising the digital signal, the apparatus comprising: a first encoder for generating at least a first identification code indicating presence of both the horizontal synchronous signal and the vertical synchronous signal, a second identification code indicating presence of the horizontal synchronous signal, a third identification code indicating presence of the vertical synchronous signal, and a fourth identification code indicating a start position of the video signal; a multiplexer for multiplexing the video signal and the first to fourth identification codes while arranging the fourth signal ahead of the video signal to output a signal obtained by the multiplexing as a first data string which has a first bit number; a second encoder for converting an output of the multiplexer to a second data string which has a second bit number larger than the first bit number; a bit stream converter for converting the second data string to a bit stream signal; and a light emitter for transmitting the bit stream signal as the light signal.