Patent ID: 6559899
Filing Date: 2003-05-06
Classification: H03D,H04N

Abstract:
A digital television tuner comprising:a frequency connector to convert a frequency of a digital television signal of a channel to be received from among channels arranged in a predetermined frequency band into not less than a highest frequency of said frequency band; two mixers to output two baseband signals whose phases are mutually orthogonal to each other by demodulating the frequency-converted digital television signal; a local oscillator to input local oscillation signals whose phases are mutually orthogonal to each other to said two mixers; an adder to add together said two baseband signals, wherein a frequency of said local oscillation signals is set to be a frequency at an end of the band in the channel of the frequency-converted digital television signal, and the phase of one of said baseband signals is converted into the phase of the other baseband signal, after which the baseband signals are input to said adder; and a Hilbert filter provided between one of said mixers and said adder, wherein one of said baseband signals is input to said adder via said Hilbert filter.