Patent ID: 7436914

Claim:
A receiving apparatus for providing television signals, comprising: a first antenna; a second antenna; a first signal quality measuring device electrically connected to the first antenna for generating a first signal quality indicator corresponding to signals from the first antenna; a second signal quality measuring device electrically connected to the second antenna for generating a second signal quality indicator corresponding to signals from the second antenna, wherein the first and second signal quality measuring devices are respectively first and second demodulators capable of generating signal quality indicators; a decision unit electrically connected to the first and second signal quality measuring devices for controlling the receiving apparatus to selectively produce only a main picture signal or the main picture signal together with a sub picture signal utilizing the signals from the antennas according to the first and second signal quality indicators; a first backend processor electrically connected to the first demodulator; and a second backend processor electrically connected to the second demodulator; wherein if the first signal quality indicator is less than a first threshold value, and the second signal quality indicator is less than a second threshold value, then the decision unit permits the first demodulator to co-operate with the first backend processor to generate the main picture signal according to the signals from the first antenna, and also permits the second demodulator to co-operate with the second backend processor to generate the sub picture signal according to the signals from the second antenna.