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    • 3. 发明授权
    • Digital blocks television tuner having simple baseband signal processing portion
    • 具有简单基带信号处理部分的数字电视调谐器
    • US06559899B1
    • 2003-05-06
    • US09598966
    • 2000-06-21
    • Takao SuzukiAkira TakayamaShigeru Osada
    • Takao SuzukiAkira TakayamaShigeru Osada
    • H04N550
    • H04N5/4446H03D3/008H04N5/4401H04N5/455H04N21/4263
    • A digital television tuner is realized in which the construction of a baseband signal processing portion is simple, it is difficult for a local oscillation signal to leak to the input end side, and in which image interference is suppressed. The digital television tuner includes a frequency conversion device for converting the frequency of a digital television signal of a channel to be received from among channels arranged in a predetermined frequency band into the highest frequency of the frequency band or higher; two mixing devices for outputting two baseband signals whose phases are mutually orthogonal to each other by demodulating the frequency-converted digital television signal; a local oscillation device for inputting local oscillation signals whose phases are mutually orthogonal to each other to the two mixing devices; and an addition device for adding together the two baseband signals, wherein the frequency of the local oscillation signals is set to be the same frequency as the frequency at the end of the band in the channel of the frequency-converted digital television signal, and one of the baseband signals is converted into the same phase as that of the other, after which the signals are input to the addition device.
    • 实现数字电视调谐器,其中基带信号处理部分的构造简单,本地振荡信号难以泄漏到输入端侧,并且抑制了图像干扰。 数字电视调谐器包括:频率转换装置,用于将布置在预定频带中的频道中的要接收的频道的数字电视信号的频率转换为频带的最高频率; 两个混合装置,用于通过解调频率转换的数字电视信号来输出相位彼此相互正交的两个基带信号; 本地振荡装置,用于输入其相位彼此相互正交的本地振荡信号到两个混合装置; 以及用于将两个基带信号相加在一起的加法装置,其中本地振荡信号的频率被设置为与频率转换的数字电视信号的信道中的频带末端的频率相同的频率,一个 的基带信号被转换成与另一个基带信号相同的相位,之后信号被输入到加法装置。
    • 7. 发明授权
    • Microwave oscillator
    • 微波振荡器
    • US4724403A
    • 1988-02-09
    • US855185
    • 1986-04-23
    • Akira Takayama
    • Akira Takayama
    • H03B5/18H01P7/10H03B9/12H03B9/14H03B7/14
    • H01P7/10
    • A microwave oscillator of the type in which a dielectric resonator is disposed inside a conductive housing, characterized in that a conductive rod-like member is disposed inside the housing and arranged in parallel with the axis of the dielectric resonator with one end connected electrically to the housing and the other end left free. Preferrably, the rod-like member is made so thin as to interrupt little the magnetic flux generated by the dielectric resonator, and the resonance frequency of the housing is selected lower than that of the dielectric resonator.
    • 一种微波振荡器,其中介质谐振器设置在导电壳体的内部,其特征在于,导电杆状构件设置在壳体内部并且与介质谐振器的轴线平行地布置,其一端电连接到 住房和另一端免费。 优选地,棒状构件被制成如此薄以致中断由介质谐振器产生的很小的磁通量,并且壳体的谐振频率被选择为低于介质谐振器的谐振频率。