| 摘要 |
PURPOSE:To obtain a high quality picture regardless of transmission range by adding an output of a sender side TTL and an output being the differentiation of the output of the TTL by a differentiation circuit and sending the sum to a transmission line so as to attain the long range transmission of an RGB picture signal. CONSTITUTION:The differentiation circuit comprising a capacitor 6 and a resistor 7 is connected to the output of the sender side TTL 1 and the end of turn of the secondary winding of a transformer 5 is connected. The start of turn of the primary winding of the transformer 5 is connected to the output of the sender TTL 1, and the end of turn is used as the transmission output and the start of turn of the secondary winding is connected to a reference potential. The differentiation circuit comprising the capacitor 6 and the resistor 7 differentiates the output of the sender side TTL 1 and the transformer 5 has a function adding the output of the sender TTL 1 and the output of the differentiation circuit. Thus, a received waveform is close to a square wave, the long range transmission of the RGB picture signal is attained and high quality picture is obtained independently of the transmission range.
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