Patent ID: 6281946
Filing Date: 2001-08-28
Classification: H03J

Abstract:
A television receiving apparatus comprising:a tuner for converting a received signal to an intermediate frequency signal;filter means for receiving said intermediate frequency signal and for supplying a filtered intermediate frequency signal to a homodyne detector circuit, wherein said homodyne detector circuit detects and outputs a video signal;variable frequency oscillating means for shifting a frequency of said intermediate frequency signal such that a harmonic signal of said intermediate frequency signal induced into said tuner is coincident with a trap frequency of said filter means after said harmonic signal is converted by said tuner, wherein an output of said variable frequency oscillating means is fed to said homodyne detector circuit; andintermediate frequency signal control means for controlling said variable frequency oscillating means for changing the frequency of said intermediate frequency signal at every selected channel, whereinsaid tuner includes frequency converting means for converting said received signal into said intermediate frequency signal such that a frequency of a detecting signal of said homodyne detector circuit is coincident with the frequency of said intermediate frequency signal, andthe frequency of the detecting signal of said homodyne detector circuit is changed by said variable frequency oscillating means so that the frequency of said intermediate frequency signal is made coincident with the frequency of the detecting signal of said homodyne detector circuit.