Patent ID: 8331431

Claim:
A signal transmission apparatus that transmits a signal through a transmission line, the signal transmission apparatus comprising: a first-signal transmitting unit configured to transmit a first signal, used for measuring a characteristic of the transmission line, to the transmission line; a reflection-characteristic measuring unit configured to measure a reflection characteristic of the transmission line based on a signal resulting from reflection of the first signal from the transmission line; a transmission-characteristic measuring unit configured to measure a transmission characteristic of the transmission line based on a signal resulting from transmission of the first signal through the transmission line; a determining unit configured to determine a transmission clock frequency and a multi-value number based on the reflection characteristic measured by the reflection-characteristic measuring unit, and the transmission characteristic, measured by the transmission-characteristic measuring unit; a second-signal transmitting unit configured to modulate information using the transmission clock frequency and the multi-value number, determined by the determining unit to transmit a second signal resulting from the modulation to the transmission line; and a second-signal receiving unit configured to receive and demodulate the second signal, which is transmitted from the second-signal transmitting unit and passes through the transmission line.