Patent ID: 6901138
Filing Date: 2005-05-31
Classification: H04L

Abstract:
1. An initializing method of a digital communication system using a telephone line, the method comprising the steps of: (a) setting to a predetermined maximum value a gain of an amplifier for amplifying a signal received through the telephone line; (b) transmitting a signal for requesting to establish a communications channel; (c) reducing the gain of the amplifier to a predetermined level when a peak value of the received signal outputted from the amplifier during a predetermined time period is larger than a reference value; (d) converting the received signal in a time-domain to signals in a frequency-domain; (e) detecting a frequency of a signal that has the greatest intensity among the signals in the frequency-domain; and (f) repeating the steps (b) to (e) until the signals of detected frequencies within a desired frequency band are inputted by a predetermined number.