Patent ID: 7113758

Claim:
An automatic gain controller comprising: a first variable gain amplifying means for amplifying an input signal; a filter for limiting a band of an output signal of the first variable gain amplifying means; a second variable gain amplifying means for outputting an output signal of the filter to an exterior by amplifying the output signal of the filter; a first control signal generating means generating a first control signal for controlling a level of the output signal of the first variable gain amplifying means to a predetermined level; a second control signal generating means generating a second control signal for controlling a level of an output signal of the second variable gain amplifying means to a predetermined level and outputting the second control signal to the second variable gain amplifying means; and a control signal selecting means selecting one of the first and second control signals generated from the first and second control signal generating means and outputting a selected control signal to the first variable gain amplifying means.