| 摘要 |
For recognizing a binary word in a bit stream in the form of light pulses in an optical conductor, the light signals arriving are distributed among a number of optical conductors. The number of conductors is equal to the number of bits of the word to be recognized. The optical conductors have a length which is stepped in unit steps according to the bit distance in the bit stream, so that the delay in each conductor is equal to the time between the bit associated with this light conductor and the last bit of the word. The ends associated with optical conductors of the one bit value are connected to a photodetector. The ends of the other optical conductors are connected to a second photodetector. A differential amplifier determines the difference between the two output signals. When the difference is maximum, the word has been recognized.
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