Patent ID: 6226504
Filing Date: 2001-05-01
Classification: H03G

Abstract:
A receiving apparatus for receiving a desired channel signal in a predetermined communication band, comprising;first amplifier means for selectively carrying out an amplification and an attenuation of an input signal and for handling a signal in said communication band;converter means for converting said channel signal outputted from said first amplifier means into an intermediate frequency signal or a base band signal;second amplifier means for amplifying a signal converted by said converter means in a gain variable fashion;level detecting means for detecting a signal level of a receiving channel by detecting an output level of said second amplifier means;gain setting means for a setting a gain of said second amplifier means based on a detected output of said level detecting means;detector means for detecting said input signal level by detecting an output of said first amplifier means; andcontrol means for selecting the amplification or the attenuation in said first amplifier means based on a detection output of said detector means;wherein when said detector means detects a strong input signal by its detection and said first amplifier means attenuates the input signal, if said level detecting means detects that a signal level of the receiving channel is less than a predetermined level, said first amplifier means amplifies the input signal and at the same time the gain of said second amplifier means is decreased correspondingly.