| 摘要 |
A digital television signal receiving tuner system is formed of a tuner (1) and an intermediate frequency circuit (2). The tuner has a first mixer (6) that converts a television signal into a first intermediate frequency signal, which is a television intermediate frequency signal. The intermediate frequency circuit has a second mixer (23) that converts the first intermediate frequency signal into a second intermediate frequency signal. The intermediate frequency circuit is provided with an adjacent-band attenuation device (21) at a stage before the second mixer. The adjacent-band attenuation device attenuates the band levels of channels located adjacent to the first intermediate frequency signal by 60 dB or greater relative to the band level of the first intermediate frequency signal. As a consequence, upon receiving digital television signals, interference from analog television signals is eliminated, and the generation of distortion is suppressed even in a wide gain control range. <IMAGE> |
