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    • 24. 发明授权
    • Tuner apparatus
    • 调谐器
    • US07249368B2
    • 2007-07-24
    • US09855786
    • 2001-05-15
    • Kazuhiko MaejimaToshiyuki YamauchiKoichi Ohya
    • Kazuhiko MaejimaToshiyuki YamauchiKoichi Ohya
    • H04N7/20
    • H04N5/4446H03D5/00H03J5/242H04N5/4401H04N5/46H04N7/20H04N21/4263H04N21/6112H04N21/6143
    • The present invention provides a tuner apparatus operating as a common tuner capable of receiving both satellite digital TV and terrestrial TV broadcasting. A tuner configured, according to the invention operates as follows. As the tuner apparatus receives satellite TV broadcasting, intermediate-frequency signals SIF1 are supplied to its quadrature detector circuit where the SIF1 signals are demodulated into baseband signals SI and SQ by using oscillation signals supplied thereto from its oscillator. As the tuner apparatus receives terrestrial TV or CATV broadcasting, terrestrial TV or CATV broadcast wave signals are supplied to its mixer circuit where these signals are frequency-converted into intermediate-frequency signals SIF1 that fall within the bandwidth of the satellite TV broadcasting SIF1 signals. The first intermediate-frequency signals SIF1 are supplied to the quadrature detector circuit where the SIF1 signals are frequency-converted into second SIF2 signals by using oscillation signals supplied thereto from the oscillator.
    • 本发明提供一种作为能够接收卫星数字电视和地面电视广播的公共调谐器的调谐器装置。 根据本发明构造的调谐器操作如下。 随着调谐器装置接收卫星电视广播,中频信号SIF1通过使用从其振荡器提供的振荡信号提供给其正交检波电路,其中SIF1信号被解调为基带信号SI和SQ。 随着调谐器装置接收到地面电视或CATV广播,地面电视或CATV广播波信号被提供给其混频电路,其中这些信号被频率转换成属于卫星TV广播SIF1信号的带宽内的中频信号SIF 1 。 第一中频信号SIF1被提供给正交检波电路,其中SIF1信号通过使用从振荡器提供的振荡信号被频率转换成第二SIF2信号。