Patent ID: 7030937

Claim:
A TV tuner intermediate frequency circuit comprising: a mixer which converts a frequency of one of a TV signal and an FM broadcasting signal into a frequency in a TV intermediate frequency band; and an intermediate frequency amplifying circuit which amplifies the intermediate frequency signal, wherein between the mixer and the intermediate frequency amplifying circuit there are: an intermediate frequency tuning circuit which, for reception of the TV signal, is tuned between a chrominance subcarrier frequency and a video intermediate frequency in the intermediate frequency band, and for reception of the FM broadcasting signal, is tuned nearly to the chrominance subcarrier frequency; and a first trap circuit which attenuates a sound intermediate frequency of an adjacent channel; and next to the intermediate frequency amplifying circuit there is: a second trap circuit which, for reception of the TV signal, brings about attenuation between the video intermediate frequency in the intermediate frequency band and the sound intermediate frequency of the adjacent channel and, for reception of the FM broadcasting signal, brings about attenuation around the video intermediate frequency.