Patent ID: 6587503
Filing Date: 2003-07-01
Classification: H04B

Abstract:
An information processing apparatus that receives and processes digital data transmitted through a transmission line, the apparatus comprising:amplitude value detection means for detecting an amplitude value of a received signal; code judgment detection means for detecting a code judgment point based on the amplitude value detected by said amplitude value detection means; code change point detection means for detecting a code change point based on the amplitude value detected by said amplitude value detection means; noise detection means for detecting signal noise from the code judgment point detected by said code judgment detection means and the code change point detected by said code change point detection means; symbol clock signal synchronous with a symbol of the received signal, wherein said code point detection means and said code change point detection means perform said respective detecting after symbol synchronization is established by said symbol clock generation means; and carrier regeneration means connected to said symbol clock generation means for performing carrier regeneration, wherein whether to perform frequency sweeping in said carrier regeneration means is based on a detection result of said noise detection means.