Patent ID: 6489854
Filing Date: 2002-12-03
Classification: G01B,H01L,H03H

Abstract:
An electronic apparatus for automatically detecting a length of a network transmission line, comprising:a detection device for generating a frequency response of a reference signal, said detection device comprising: a transistor detector for detecting a detection level corresponding to said reference signal; a zero-adjusting, device for generating a zero level; and a differential amplifier, coupled to said transistor detector and said zero-adjusting device, respectively, for amplifying a difference between the detection level and the zero level to generate a detection signal; an analog/digital converter, coupled to said detection device, for converting the detection signal into a digital signal to generate a full-scale level via a reference voltage; a microprocessor, coupled to said analog/digital converter, for transferring the digital signal into a control signal; and a frequency compensator, coupled to said microprocessor via said network transmission line, the frequency compensator comprising a decayed device, wherein the decayed device receives a video frequency from said network transmission line and applies the control signal to said decayed device to compensate the video frequency.