Patent ID: 6714262
Filing Date: 2004-03-30
Classification: H03J,H04N

Abstract:
A channel selection apparatus for digital TV broadcast use for receiving a first intermediate frequency (IF) signal and for automatically sweeping a predetermined frequency range for tuning, said apparatus comprising channel selection means, and reproduction means, wherein said channel selection means:oscillation signal creation means for creating a local oscillation signal to be used for changing the frequency of the first IF signal; frequency conversion means for converting the first IF signal into a second IF signal by using the local oscillation signal created by said oscillation signal creation means; data demodulation means for demodulating data from the second IF signal; signal level detection means for detecting a signal level of the data demodulated by said data demodulation means; and operation switching means for deciding whether the signal level detected by said signal level detection means is larger than a reference value, said operation switching means being operable to change the frequency of the local oscillation signal by an amount corresponding to said predetermined frequency range without subsequently operating said reproduction means so as operation in a new frequency range, if it is decided that the signal level detected by said signal level detection means is equal to or smaller than the reference value, and said reproduction means comprises: data reproduction means for reproducing service data for providing a service from the data demodulated by said data demodulation means.