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113 条记录 (耗时 0.019 秒)

    RF TRANSMITTER FOR ELECTRICALLY SHORT ANTENNA
    44.
    发明申请
    RF TRANSMITTER FOR ELECTRICALLY SHORT ANTENNA 审中-公开

    公开(公告)号：US20160049967A1

    公开(公告)日：2016-02-18

    申请号：US14925760

    申请日：2015-10-28

    申请人： OTICON A/S

    发明人： Kåre Tais CHRISTENSEN

    IPC分类号： H04B1/04

    CPC分类号： H04B1/04 ,  H03J5/00

    摘要： An RF transmitter comprises a capacitive energy storage, an output stage and a switching circuit with an open state and a closed state. The capacitive energy storage forms with the antenna when connected thereto a resonance circuit with a resonance frequency and a quality factor. The output stage provides an electric transmission signal to the resonance circuit. The switching circuit comprises a first transistor for switching between the open state and the closed state and is connected to an antenna output terminal through a capacitance formed by the capacitive energy storage such that the maximum signal voltage occurring across the switching circuit in its open state is lower than the maximum signal voltage occurring across the antenna output terminals. The transmitter is adapted to alter the quality factor by changing the series resistance of the switching circuit in its closed state.

    RF TRANSMITTER FOR ELECTRICALLY SHORT ANTENNA
    45.
    发明申请
    RF TRANSMITTER FOR ELECTRICALLY SHORT ANTENNA 有权
    射频发射机用于电气短路天线

    公开(公告)号：US20130137387A1

    公开(公告)日：2013-05-30

    申请号：US13683132

    申请日：2012-11-21

    申请人： OTICON A/S

    发明人： Kâre Tais CHRISTENSEN

    IPC分类号： H04B1/04

    CPC分类号： H04B1/04 ,  H03J5/00

    摘要： An RF transmitter comprises a capacitive energy storage, an output stage and a switching circuit with an open state and a closed state. The capacitive energy storage forms with the antenna when connected thereto a resonance circuit with a resonance frequency and a quality factor. The output stage provides an electric transmission signal to the resonance circuit. The switching circuit comprises a first transistor for switching between the open state and the closed state and is connected to an antenna output terminal through a capacitance formed by the capacitive energy storage such that the maximum signal voltage occurring across the switching circuit in its open state is lower than the maximum signal voltage occurring across the antenna output terminals. The transmitter is adapted to alter the quality factor by changing the series resistance of the switching circuit in its closed state.

    摘要翻译： RF发射机包括电容性能量存储器，输出级和具有打开状态和闭合状态的开关电路。 当连接到具有共振频率和质量因子的谐振电路时，电容性能量存储与天线形成。 输出级向谐振电路提供电传输信号。 开关电路包括用于在打开状态和闭合状态之间切换的第一晶体管，并且通过由电容性能量存储形成的电容连接到天线输出端子，使得开关电路在其打开状态下出现的最大信号电压为 低于跨天线输出端子发生的最大信号电压。 变送器适于通过改变开关电路处于闭合状态的串联电阻来改变品质因数。

    Receiver with a crystal oscillator having a natural-oscillation frequency set so that a fundamental component and its harmonics are outside the range of a receiving band of a modulated wave signal
    46.
    发明授权
    Receiver with a crystal oscillator having a natural-oscillation frequency set so that a fundamental component and its harmonics are outside the range of a receiving band of a modulated wave signal 有权
    具有设定了固有振荡频率的晶体振荡器的接收器，使得基波分量及其谐波在调制波信号的接收频带的范围之外

    公开(公告)号：US07212794B2

    公开(公告)日：2007-05-01

    申请号：US10482011

    申请日：2002-06-26

    申请人： Hiroshi Miyagi

    发明人： Hiroshi Miyagi

    IPC分类号： H04B5/00 ,  H04B7/00

    CPC分类号： H04B1/28 ,  H03J5/00 ,  H03J2200/17 ,  H04B1/26 ,  H04B15/04 ,  H04B15/06 ,  H04B2215/065

    摘要： A receiver in which the sneaking noise from a crystal oscillator is reduced. A high-frequency amplifier circuit 11, a mixing circuit 12, a local oscillator 13, intermediate-frequency filters 14 and 16, an intermediate-frequency amplifier circuit 15, a limit circuit 17, an FM detection circuit 18, and a stereo demodulation circuit 19, an oscillator 20, and a PLL circuit 21 all constituting an FM receiver are provided as a one-chip component 10. A crystal oscillator 31 as an external component is connected to the oscillator 20. The natural-oscillation frequency of the crystal oscillator 31 is so set that the fundamental component and its harmonics are out of the reception band.

    摘要翻译： 来自晶体振荡器的噪音降低的接收器。 高频放大器电路11，混合电路12，本地振荡器13，中频滤波器14和16，中频放大器电路15，限位电路17，FM检测电路18和立体声解调电路 如图19所示，构成FM接收机的振荡器20和PLL电路21被提供为单芯片部件10。 作为外部元件的晶体振荡器31连接到振荡器20。 晶体振荡器31的自然振荡频率被设定为使得基波分量及其谐波不在接收频带内。

    Wireless receiver
    47.
    发明申请
    Wireless receiver 审中-公开
    无线接收器

    公开(公告)号：US20040166825A1

    公开(公告)日：2004-08-26

    申请号：US10372189

    申请日：2003-02-25

    发明人： Jen-Sheng Huang ,  Yeong-Luh Ueng

    IPC分类号： H04B001/26 ,  H04B015/00

    CPC分类号： H04B1/26 ,  H03J5/00

    摘要： The present invention provides a wireless receiver with the multi-channel or the single-channel. The present invention is utilizing a pre-selector to pre-choose the signal within the category of the frequency band. Then, according to the different channel code to choose the corresponding local oscillation frequency, the present invention utilizes a frequency down converter referring to the local oscillation frequency to sequentially performing the frequency down step and the filtering step to obtain a low frequency signal. Then, a low pass filter is used to perform the filtering step of the low frequency signal, a limiter is used to amplify the signal, and a frequency discriminator is used to demodulate the signal so as to obtain a base-band signal. The present invention can simplify the complexity of the apparatus and quickly change the channel to achieve the effect of multi-channel receiving to achieve the purpose of the application of receiving the signal of the multi-channel and the single channel. The present invention can also provide with the advantage of the high ability of the anti-interference.

    摘要翻译： 本发明提供一种具有多信道或单信道的无线接收机。 本发明利用预选器来预选频带范畴内的信号。 然后，根据不同的信道码选择对应的本地振荡频率，本发明利用降频转换器参考本地振荡频率来顺序地执行降频步骤和滤波步骤以获得低频信号。 然后，使用低通滤波器来执行低频信号的滤波步骤，使用限幅器来放大信号，并且使用频率鉴别器来解调信号以获得基带信号。 本发明可以简化装置的复杂性并快速改变信道以实现多信道接收的效果，以达到应用接收多信道和单信道信号的目的。 本发明还可以提供抗干扰能力高的优点。

    Fractional and rapid response frequency synthesizer, and corresponding frequency synthesizing method
    48.
    发明授权
    Fractional and rapid response frequency synthesizer, and corresponding frequency synthesizing method 失效
    分数和快速响应频率合成器，以及相应的频率合成方法

    公开(公告)号：US06661291B2

    公开(公告)日：2003-12-09

    申请号：US09965412

    申请日：2001-09-27

    申请人： Fabrice Jovenin

    发明人： Fabrice Jovenin

    IPC分类号： H03L700

    CPC分类号： H03L7/1974 ,  H03J5/00 ,  H03J5/0245 ,  H03J5/24 ,  H03J7/065 ,  H03J2200/10 ,  H03J2200/29 ,  H03L7/099 ,  H03L2207/06

    摘要： The present invention relates a frequency synthesizer comprising in a phase-locked loop: a phase-frequency comparator (16) connected to a reference frequency source (20), at least a voltage-controlled oscillator (12) and a fractional frequency divider (14) suitable for producing a mean dividing ratio having an integral component and a fractional component. According to the invention, the oscillator comprises a plurality of oscillator stages which have different center frequencies, and the synthesizer further includes means for selecting an oscillator stage as a function of the integral component of the mean dividing ratio. Application to portable telephones.

    摘要翻译： 本发明涉及一种频率合成器，包括：锁相环：连接到参考频率源（20）的至少一个压控振荡器（12）和一个分数分频器（14）的相位 - 频率比较器（16） 适合于产生具有积分分量和分数分量的平均分频比。根据本发明，振荡器包括具有不同中心频率的多个振荡器级，并且合成器还包括用于选择振荡器级作为 平均分频比的积分分量。应用于便携式电话。

    Control device for a communication system of an aircraft, in particular of a transport plane
    49.
    发明申请
    Control device for a communication system of an aircraft, in particular of a transport plane 有权
    用于飞行器，特别是运输平面的通信系统的控制装置

    公开(公告)号：US20020119758A1

    公开(公告)日：2002-08-29

    申请号：US10067272

    申请日：2002-02-07

    发明人： Jerome Gouillou

    IPC分类号： H04B001/40

    CPC分类号： G08G5/0013 ,  G08G5/0008 ,  G08G5/0021 ,  H03J1/045 ,  H03J5/00

    摘要： Control device for a communication system of an aircraft, in particular of a transport plane. The control device (1) comprises control means (10), display means (9) which depict on a presentation screen (17) at least two communication values (radio frequencies and/or telephone numbers) which have been selected and activated by way of the control means (10), among which, as the case may be, is the communication value which has been selected for the transmission, and mixing means (14, 15B) for mixing all the communication values which have been selected and activated by way of the control means (10).

    摘要翻译： 用于飞行器，特别是运输平面的通信系统的控制装置。 控制装置（1）包括控制装置（10），显示装置（9），其在呈现屏幕（17）上描绘已经通过以下方式选择和激活的至少两个通信值（无线电频率和/或电话号码） 控制装置（10），其中，视情况而定，是为传输选择的通信值，以及混合装置（14,15b），用于混合通过方式选择和激活的所有通信值 的控制装置（10）。

    Double tuning circuit of TV tuner
    50.
    发明授权
    Double tuning circuit of TV tuner 失效
    电视调谐器双调谐电路

    公开(公告)号：US5821838A

    公开(公告)日：1998-10-13

    申请号：US763638

    申请日：1996-12-04

    申请人： Takeo Suzuki ,  Masaki Yamamoto ,  Masashi Suzuki ,  Yasuharu Kudo

    发明人： Takeo Suzuki ,  Masaki Yamamoto ,  Masashi Suzuki ,  Yasuharu Kudo

    IPC分类号： H03J5/00 ,  H03J5/24 ,  H04B1/26 ,  H04N5/44 ,  H04N5/50

    CPC分类号： H03J5/246 ,  H03J5/00 ,  H04N5/50

    摘要： The double tuning circuit of a TV tuner provided by the present invention comprises a primary tuning circuit and a secondary tuning circuit coupled with each other wherein at least one of the primary and secondary tuning circuits comprises two series circuits connected to each other in parallel with each of the two series circuits including damping resistors and/or resonance capacitors in addition to switching diodes which are each selectively turned on and off by using a predetermined switching voltage corresponding to signal reception states so that the frequency response of an intermediate-frequency signal obtained on the output side of the double tuning circuit is fixed independently of a channel receiving the incoming signal and the intensity of the electric field of the incoming signal.

    摘要翻译： 由本发明提供的TV调谐器的双调谐电路包括彼此耦合的初级调谐电路和二次调谐电路，其中初级和次级调谐电路中的至少一个包括彼此并联连接的两个串联电路 包括阻尼电阻器和/或谐振电容器以及除开关二极管之外的两个串联电路，所述开关二极管通过使用与信号接收状态相对应的预定开关电压来选择性地导通和截止，使得获得的中频信号的频率响应 双调谐电路的输出侧独立于接收输入信号的信道和输入信号的电场强度而固定。