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    • 11. 发明授权
    • Synchronization adder circuit
    • 同步加法器电路
    • US5574450A
    • 1996-11-12
    • US302029
    • 1994-09-09
    • Katsuhiko HiramatsuKazunori InogaiKimihiko Ishikawa
    • Katsuhiko HiramatsuKazunori InogaiKimihiko Ishikawa
    • H04J1/00H04L5/06H04L7/02H04L27/22H04L27/38H03M1/48
    • H04L7/0054H04L5/06
    • A synchronization adder circuit for digital data communication includes an A/D converter, a waveform-shaping circuit, a square circuit, a low-pass filter, and an adder. The A/D converter samples at given sampling points in time per sampling cycle a received signal transmitted through a plurality of subcarriers to digitize sampled values to provide digital signals. The waveform-shaping circuit then waveform-shapes the digital signals from said A/D converter without decomposing them with respect to each subcarrier. The square circuit squares the output signals from the waveform-shaping circuit. The low-pass filter removes a given high-frequency component from output signals from the square circuit. The adder adds values of output signals from the low-pass filter at each sapling point for preselected sapling cycles to determine the samples suitable for reproduction of original data.
    • 用于数字数据通信的同步加法器电路包括A / D转换器,波形整形电路,平方电路,低通滤波器和加法器。 A / D转换器在每个采样周期的给定采样点采样时间,通过多个子载波传输的接收信号以数字化采样值以提供数字信号。 然后,波形整形电路对来自所述A / D转换器的数字信号进行波形整形,而不会相对于每个子载波分解它们。 平方电路对来自波形整形电路的输出信号进行平方。 低通滤波器从平方电路的输出信号中去除给定的高频分量。 加法器在预选的树苗周期中,在每个树苗点处从低通滤波器输出的信号值,以确定适合于再现原始数据的样本。
    • 18. 发明授权
    • Receiving circuit
    • 接收电路
    • US06236688B1
    • 2001-05-22
    • US09258402
    • 1999-02-26
    • Gen-ichiro OhtaKazunori InogaiFujio Sasaki
    • Gen-ichiro OhtaKazunori InogaiFujio Sasaki
    • H03D318
    • H04B1/0032H03D1/2245H03D7/165H03D2200/0047H03D2200/005H03D2200/0082H03F3/45475H03F3/50H03F2200/537H04B1/0003H04B1/123H04B1/26H04B5/0093Y02D70/40Y02D70/42
    • A receiving circuit mainly available in a digital modulation type communication system having a plurality of channels, which is capable of reducing power in a receiving system, simplifying the circuit and reducing the power consumption. Upside and downside frequencies corresponding to a central value between channels are separately supplied from a local frequency signal generating circuit 4 to first and second frequency converting circuits 2, 3 so that two output signals are developed with respect to one of a desired wave, upside channel and downside channel. The desired wave present in common in the first and second frequency converting circuits 2, 3 is extracted in a common wave extracting circuit 5, and a frequency offset of &ohgr;o existing in the output of the common wave extracting circuit 5 is removed a frequency offset circuit 6 and further an unnecessary frequency component is filtered by a filter 8. In addition, the common wave extracting circuit 5 has transformers and, using its inductances, raises the difference between the common wave and the non-common wave within the circuit to more than two times that of a prior art.
    • 主要可用于具有多个信道的数字调制型通信系统中的接收电路,其能够降低接收系统的功率,简化电路并降低功耗。 对应于通道之间的中心值的上升和下降频率从本地频率信号发生电路4分别提供给第一和第二频率转换电路2,3,使得两个输出信号相对于所需波形,上行通道 和下行通道。 在公共波提取电路5中提取在第一和第二频率转换电路2,3中共同存在的期望的波,并且公共波提取电路5的输出中存在的ωω的频率偏移被去除频率偏移电路 此外,公共波提取电路5还具有变压器,并且使用其电感将电路内的公共波和非公共波之间的差异提高到超过 是现有技术的两倍。
    • 19. 发明授权
    • Frequency conversion and modulation circuits
    • 变频调制电路
    • US5848100A
    • 1998-12-08
    • US653841
    • 1996-05-28
    • Kazunori Inogai
    • Kazunori Inogai
    • H03C1/00H03D7/00H03H17/04H03H7/30
    • H03H17/0671H03C1/00H03D7/00
    • In a frequency conversion circuit and a modulation circuit, a filter having an impulse response (HB(z); HL(z)) corresponding to a rectangular pulse wave multiplied by a cosine wave of f.sub.3 /4 is a band pass type filter having a center frequency of f.sub.3 /4, and the transfer function H(z) of the filter is expressed in the form of a sum of series. When a numerator part of the transfer function is arranged to be processed with a low-speed sampling frequency f.sub.2 and a denominator part is to be processed with a high-speed sampling frequency f.sub.3 (=L.times.f.sub.2, L: odd number), the circuit can be made to have an adjustment-free structure and small in size. Further, when an output of processing of the numerator part based on the low-speed sampling frequency f.sub.2 is subjected to a D/A conversion while processing of the denominator part based on the high-speed f.sub.3 is implemented by a switched capacitor circuit, power consumption can be reduced.
    • 在频率转换电路和调制电路中,对应于乘以f3 / 4的余弦波的矩形脉冲波的脉冲响应(HB(z); HL(z))的滤波器是带通滤波器,具有 f3 / 4的中心频率和滤波器的传递函数H(z)以串联的形式表示。 当传递函数的分子部分被布置为以低速采样频率f2进行处理时,以高速采样频率f3(= Lxf2,L:奇数)处理分母部分时,电路可以 使其具有无调整的结构,体积小。 此外,当基于低速采样频率f2的分子部分的处理输出进行D / A转换,而通过开关电容电路实现基于高速f3的分母部分的处理时,功率 消费可以减少。