| 摘要 |
PURPOSE:To read out accurately digital information by carrying out an integrating operation for each cycle of the 2nd pulse signal showing the clock component among positive and negative pulses of the reproduced output and therefore detecting the pulse number of the 1st pulse signal component in the form of its corresponding voltage. CONSTITUTION:The output of an integration circuit is separated into positive and negative parts by diodes D1 and D2 respectively and then sampled by a sampling/holding circuit SH and a sampling pulse generating circuit SP in the rise timing of each sampling pulse St2. The output of the diode D1 of the positive side is obtained by sampling in the form of voltage of two stages +E and O. The sampling result of the output of the diode D2 of the negative side is obtained in the form of voltage of two stages -E2 (¦E2¦=¦E1¦) and O. As a result, the voltage E1 and E2 are decided by the pulse widths of a pulse train Sn and a timing pulse St1b as well as constant current sources I 1 and I 2. |
