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    • 2. 发明授权
    • Television tuner having level of harmonics of oscillation signal suppressed low
    • 具有振荡信号的谐波电平的电视调谐器抑制得较低
    • US07129994B2
    • 2006-10-31
    • US10655155
    • 2003-09-04
    • Michinori SasakiHiroyuki Sawamoto
    • Michinori SasakiHiroyuki Sawamoto
    • H04N5/44H04N5/62H04N5/63H04N7/18H04N9/47H04B1/10H04B15/06H05K1/18H03J1/00H03J3/00H03J5/00
    • C03C13/04H03D7/161H04N5/50H04N21/426
    • The level of the harmonics of oscillation signals for synchronous detection to be inputted to a mixer circuit for converting frequencies is suppressed low. A first integrated circuit component formed with a first mixer circuit for converting frequencies; a second integrated circuit component formed with a second mixer circuit for synchronously detecting intermediate frequency signals and an oscillator transistor circuit; a resonant circuit coupled to the oscillator transistor circuit and forming an oscillator circuit for synchronous detection; an intermediate frequency tuning circuit interposed between the first mixer circuit and the second mixer circuit; and a circuit board for mounting the first integrated circuit component, the second integrated circuit component the intermediate frequency tuning circuit and the resonant circuit in a predetermined block area are provided, wherein the resonant circuit is mounted on the side opposite to the side where the first integrated circuit component and the intermediate frequency tuning circuit are mounted as the second integrated circuit component is sandwiched.
    • 要输入到用于转换频率的混频器电路的同步检测的振荡信号的谐波电平被抑制得低。 第一集成电路部件,形成有用于转换频率的第一混频器电路; 第二集成电路部件,形成有用于同步检测中频信号的第二混频器电路和振荡晶体管电路; 耦合到所述振荡晶体管电路并形成用于同步检测的振荡电路的谐振电路; 介于所述第一混频电路和所述第二混频电路之间的中频调谐电路; 以及用于将第一集成电路部件,第二集成电路部件,中频调谐电路和谐振电路安装在预定块区域中的电路板,其中,所述谐振电路安装在与所述第一集成电路部件相反的一侧 集成电路部件和中频调谐电路在第二集成电路部件夹持时被安装。
    • 4. 发明授权
    • Intermediate frequency circuit in television tuner with large attenuation of audio if signal in adjacent channel
    • 中频电路在电视调谐器中具有较大衰减的音频,如果信号在相邻通道
    • US06583826B1
    • 2003-06-24
    • US09580137
    • 2000-05-30
    • Hiroyuki SawamotoMasaki Yamamoto
    • Hiroyuki SawamotoMasaki Yamamoto
    • H04N550
    • H04N5/4446H04B1/1036H04N5/21H04N5/60
    • The present invention resides in the provision of an intermediate frequency circuit in a television tuner capable of enlarging the attenuation of a audio IF carrier in an adjacent channel without increasing a loss in an intermediate frequency band. The intermediate frequency circuit comprises a mixer which outputs an intermediate frequency signal, an intermediate frequency amplifier for amplifying the intermediate frequency signal outputted from the mixer 1, and a feedback circuit disposed between an input end and an output end of the intermediate frequency amplifier, and in the intermediate frequency circuit, a audio IF carrier of an adjacent intermediate frequency signal adjacent to the intermediate frequency signal is fed back from the output end to the input end of the intermediate frequency amplifier by the feedback circuit.
    • 本发明在于提供一种能够在相邻信道中扩大音频IF载波的衰减的电视调谐器中的中频电路,而不增加中频带的损耗。 中频电路包括输出中频信号的混频器,用于放大从混频器1输出的中频信号的中频放大器和设置在中频放大器的输入端与输出端之间的反馈电路,以及 在中频电路中,与中频信号相邻的相邻中频信号的音频IF载波由反馈电路从输出端反馈到中频放大器的输入端。