Signal transmission device and endoscope system

An endoscope system comprising:

• an endoscopic scope including an insertion part that is inserted into a living body and is provided with an observation means capable of observing a distal-end side;
• a living body exterior device provided outside the living body;
• and
• the signal transmission device, the signal transmission device comprises:
• a transmission unit comprising a multi-value encoder circuit converting a transmission signal to an encoded data each of which has n types of strength level, and a strength modulation driver circuit creating a reversed data which has reverse phase to the encoded data;
• a first connection unit having a first electrode electrically connected to the transmission unit;
• a second connection unit being connected to the first connection unit, the second connection unit having a second electrode, wherein the second electrode is statically coupled to the first electrode when the second connection unit engages with the first connection unit;
• and
• a reception unit being electrically connected to the second electrode, the reception unit receiving the encoded data and the reversed data via the first connection unit and the second connection unit, and comprising a multi-value decoder circuit creating a decoded data using the encoded data and the reversed data, wherein
• the n is natural number larger than 2,
• the encoded data and the reversed data are grouped into successive signals, and
• the transmission unit transmits the successive signals and data is encoded such that the average value of the strength levels of the successive signals is substantially constant, irrespective of the size of the transmission signal, and wherein
• the transmission unit being provided in the endoscopic scope;
• the reception unit being provided in the living body exterior device;
• and the first connection unit and the second connection unit are configured to be capable of connecting and disconnecting to/from each other.