Method and apparatus for selectively receiving a satellite broadcast signal or a cable television signal

An apparatus for selectively receiving either a satellite broadcast signal or a cable television (TV) signal, the apparatus comprising:

• means for generating a first oscillation signal of a first predetermined oscillation frequency in response to a first oscillation control signal which is issued by a controller when a channel to be tuned to is selected by a user;
• means for receiving the first oscillation signal and either one of the satellite broadcast signal and the cable TV signal and mixing the first oscillation signal with either one of the satellite signal and cable TV signal to provide a first mixed signal having a first intermediate frequency (IF) signal;
• means for filtering the first mixed signal with a first predetermined filtering frequency to produce a waveformed band signal;
• means for selectively generating a second oscillation signal of a second predetermined oscillation frequency or a third oscillation signal of a third predetermined oscillation frequency in response to a second oscillation control signal which is issued by the controller when a broadcast mode signal representing a type of the broadcast signal to tune to, either the satellite broadcast signal or the cable TV signal, is selected by the user;
• means for receiving the waveformed band signal and either the second or the third oscillation signal and mixing the waveformed band signal with either the second or the third oscillation signal to generate either a second mixed signal having a second IF signal or a third mixed signal having a third IF signal;
• means, in response to the broadcast mode signal, for selectively filtering the second mixed signal with a second or a third predetermined filtering frequency to obtain a channel signal of the cable TV signal or a baseband I signal of the satellite broadcast signal which corresponds to the selected channel;
• and
• means for shifting a phase of the third oscillation signal by a predetermined degrees to issue a phase-shifted third oscillation signal and mixing the waveformed band signal with the phase-shifted third oscillation signal to generate a phase-shifted mixed signal having a phase-shifted third IF signal and filtering the phase-shifted mixed signal with the third predetermined filtering frequency to obtain a baseband Q signal of the satellite broadcast signal corresponding to the selected channel.

A selectively tunable apparatus for receiving a Radio Frequency (RF) signal and producing either a satellite broadcast signal or a cable television signal from the RF signal based on a user's selection, the apparatus comprising:

• a first local oscillator configured to output a first oscillation signal;
• first circuitry configured to mix the first oscillation signal with the RF signal thereby form a first mixed signal;
• a second local oscillator configured to selectively output either a second oscillation signal or a third oscillation signal in response to an oscillation control signal, wherein said second oscillation signal is associated with the cable television signal, and the third oscillation signal is associated with the satellite broadcast signal;
• second circuitry arranged to mix the output of the second local oscillator with the first mixed signal to thereby produce a second mixed signal;
• and
• a switch configured selectively direct the second mixed signal into either a first filter to form the cable television signal or a second filter to form the satellite broadcast signal, in response to a switching control signal,
• wherein:
• the oscillation control signal and the switching control signal are established in response to a user-selected broadcast mode signal that represents a type of broadcast signal to which the apparatus has been selectively tuned.