Patent ID: 6912247
Filing Date: 2005-06-28
Classification: H04B,H04L

Abstract:
1. A digital signal transmission system using a digital modulation system comprising a digital signal transmitter having a first digital signal processing unit producing a digital signal which includes a plurality of signal units, each having a guard interval to reduce multi-path effect and a digital signal receiver receiving a digital signal from said digital signal transmitter, wherein said digital signal receiver comprising: a second digital signal processing unit for processing said digital signal from said digital signal transmitter and outputting a digital demodulated signal and a correlation value signal from said digital demodulated signal; a signal converter, coupled with said second digital signal processing unit and supplied said correlation value signal therefrom, for generating at least a main wave signal level and a ghost imaging signal level corresponding to said correlation value signal; and a display, coupled with said signal converter, for displaying a waveform corresponding to said main wave signal level and said ghost imaging signal level in each horizontal scanning period of said display to indicate a transmission condition in said digital transmission system.