Patent ID: 6795128
Filing Date: 2004-09-21
Classification: H03J,H04N

Abstract:
A television tuner comprising:a mixer to be fed on of a television signal and an FM broadcast signal to frequency-convert the television signal to an intermediate-frequency band of a television, and frequency-convert he FM broadcast signal to a voice intermediate frequency in the intermediate-frequency band; and an intermediate-frequency tuned circuit provided at a later stage than the mixer, wherein the intermediate-frequency tuned circuit comprises a first parallel tuned circuit tuned to a frequency substantially in a center of the intermediate-frequency band, a second parallel tuned circuit tuned to a frequency lower than the voice intermediate frequency, and a switch connected in series with the second parallel tuned circuit, a signal of the intermediate-frequency band and a signal of the voice intermediate-frequency band are applied to both ends of the first parallel tuned circuit and both ends of a series circuit comprising the second parallel tuned circuit and the switch, when the television signal is received, the switch is brought into an off state, when the FM broadcast signal is received, the switch is brought into an on state, so that a parallel circuit comprising the first tuned circuit and the second tuned circuit is tuned to the voice intermediate frequency.