Patent ID: 6353462
Filing Date: 2002-03-05
Classification: H04B,H04N

Abstract:
A television signal and FM broadcast signal demodulator comprising:a first input terminal to which a video intermediate frequency signal in a television intermediate frequency signal is inputted; a second input terminal to which an audio intermediate frequency signal in said television intermediate frequency signal or an FM broadcast signal, which is frequency-converted so as to have the same frequency as that of said audio intermediate frequency signal, is inputted; a third input terminal to which a pseudo carrier having the same frequency as that of a video carrier in said television intermediate frequency signal is inputted; a change-over switch for selecting either said video intermediate frequency signal inputted to said first input terminal or said pseudo carrier inputted to said third input terminal; a video detector to which one of said video intermediate frequency signal and said pseudo carrier selected by said change-over switch is inputted; an audio intermediate frequency detector to which said audio intermediate frequency signal or said FM broadcast signal inputted to said second input terminal is inputted and generating a second audio intermediate frequency signal; an FM detector for detecting said second audio intermediate frequency signal to provide an audio signal; and a video carrier generator to which one signal selected by said change-over switch is inputted, reproducing said video carrier and inputting said reproduced video carrier into said video detector and said audio intermediate frequency detector, wherein said change-over switch connects said first input terminal, said video detector and said video carrier generator to receive said television signal and said change-over switch connects said third input terminal, said video detector and said video carrier generator to receive said FM broadcast signal.