24 on the recording medium 29 for example the write device 25 is an optical disk drive and the recording medium 29 is an optical disk the first amplifier 26 amplifies the serial data dt from the receiving device 23 and outputs it to the first output terminal t 26 the first output terminal t 26 of the recording apparatus 20 and the first input terminal t 31 of the recording apparatus 30 are connected to each other by the transmission line 2 d the second amplifier 27 amplifies the clock signal clk from the amplifier 22 and outputs it to the second output terminal t 27 the second output terminal 27 of the recording apparatus 20 and the second input terminal t 32 of the recording apparatus 30 are connected to each other by the transmission line 2 c the recording apparatus 30 comprises amplifiers 31 32 36 and 37 a receiving device 33 a data equalizer 34 and a write device 35 the write device 35 of the recording apparatus 30 records the data on a recording medium 39 for example the write device 35 is an optical disk drive and the recording medium 99 is an optical disk the amplifiers 31 32 36 and 37 the receiving device 33 the data equalizer 34 and the write device 35 have the same configurations as the amplifiers 21 22 26 and 27 the receiving device 23 the data equalizer 24 and the write device 25 so explanations of these portions having the same configuration are omitted 0086 fig3 is a schematic block diagram of the configuration of the receiving device 23 of the recording apparatus 20 shown in fig1 this receiving device 23 comprises a generation circuit 231 a.