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8 条记录 (耗时 0.009 秒)

    RADIO TERMINAL DEVICE
    1.
    发明公开
    RADIO TERMINAL DEVICE 审中-公开
    FUNKENDGERÄT

    公开(公告)号：EP1083667A4

    公开(公告)日：2004-07-14

    申请号：EP99906470

    申请日：1999-02-24

    申请人： MITSUBISHI ELECTRIC CORP

    发明人： KATSURA TAKATOSHI ,  ITOH KENJI ,  FUKUYAMA SHINJIROU ,  MOCHIZUKI MITSURU ,  NAGANO HIROAKI ,  MATSUNAMI YOSHINORI ,  ISHIZU FUMIO ,  HAYASHI RYOJI

    IPC分类号： H03G3/00 ,  H04L27/08 ,  H04B1/30 ,  H04B1/16 ,  H04B1/26

    CPC分类号： H03G3/001

    摘要： A logarithmic amplifier (11) having a large input range first detects the level of the baseband signal on the input side of a variable gain amplifier circuit (8). Based on the detected level, a control section (13) performs coarse feedfoward control of the gain of the variable gain amplifier circuit (8). A root-mean-square circuit (14) determines the output level of an A/D converter (10) and supplies it to the control section (13). Based on the detected level, the control section (13) performs fine feedback control of the variable gain amplifier (8).

    摘要翻译： 具有大输入范围的对数放大器（11）首先检测可变增益放大器电路（8）的输入侧上的基带信号的电平。 基于检测到的电平，控制部分（13）对可变增益放大器电路（8）的增益进行粗馈源控制。 均方根电路（14）确定A / D转换器（10）的输出电平并将其提供给控制部分（13）。 基于检测到的电平，控制部分（13）执行可变增益放大器（8）的精细反馈控制。

    RADIO TERMINAL
    4.
    发明公开
    RADIO TERMINAL 审中-公开
    FUNKENDGERÄT

    公开(公告)号：EP1081871A4

    公开(公告)日：2004-06-23

    申请号：EP99961470

    申请日：1999-12-28

    申请人： MITSUBISHI ELECTRIC CORP

    发明人： ITOH KENJI ,  NAGANO HIROAKI ,  KATSURA TAKATOSHI ,  FUKUYAMA SHINJIROU ,  MOCHIZUKI MITSURU ,  MATSUNAMI YOSHINORI ,  SHIMOZAWA MITSUHIRO ,  ISHIZU FUMIO ,  HAYASHI RYOJI

    IPC分类号： H03D7/14 ,  H04B1/30

    CPC分类号： H03D7/1408 ,  H04B1/30

    摘要： A portable telephone provided with a receiving circuit of direct conversion type has a passive low-pass filter (32) for filtering the interference waves of the channels other than the channel of concern and its adjacent channel interposed between an I-channel mixer (28) and a baseband circuit (36) and a passive low-pass filter (34) for filtering the interference waves of the channels other than the channel of concern and its adjacent channel interposed between a Q-channel mixer (30) and a baseband circuit (36). These low-pass filters (32, 34) are of differential type, so that their circuit scales are small and have low power consumptions. The interference waves are filtered by the passive low-pass filters (32, 34) and active low-pass filters (56, 58), so that only desired channels can be reliably received.

    摘要翻译： 具有直接转换型接收电路的便携式电话机具有一个无源低通滤波器（32），用于滤除除了涉及的信道之外的信道和插入在I信道混频器（28）之间的相邻信道的干扰波， 和一个基带电路（36）和一个无源低通滤波器（34），用于对除了所关心的信道和插入在Q信道混频器（30）和基带电路（ 36）。 这些低通滤波器（32,34）是差分型的，所以它们的电路规模很小并且功耗较低。 干扰波由无源低通滤波器（32,34）和有源低通滤波器（56,58）滤波，使得只有期望的信道能够被可靠地接收。

    TERMINAL DEVICE
    5.
    发明公开
    TERMINAL DEVICE 审中-公开
    ENDGERÄT

    公开(公告)号：EP1271687A4

    公开(公告)日：2003-07-23

    申请号：EP00987783

    申请日：2000-12-28

    申请人： MITSUBISHI ELECTRIC CORP

    发明人： SHOJI HIDEAKI ,  KATSURA TAKATOSHI ,  MATSUNAMI YOSHINORI ,  IMANISHI YASUHITO ,  TANAKA TETSUYA ,  TAKETOMI HIROKAZU

    IPC分类号： H01Q1/08 ,  H01Q1/24 ,  H04B1/38 ,  H04M1/02

    CPC分类号： H04B1/3838 ,  H01Q1/084 ,  H01Q1/243 ,  H01Q1/245 ,  H01Q1/52 ,  H01Q9/28 ,  H04M1/0214

    摘要： A portable telephone (1a) comprises a lower case (10) with first end (10a) and s second end (10b), an upper case (20) with first end (20a) rotatably attached to the first case (10) and the second end (20b), and a monopole antenna (30) built in the first end (l0a) of the lower case (10). The second end (20b) of the upper case (20) is rotatable to approach the second end (10b) of the lower case (10) or to separate from the second end (10b) of the lower case (10). The portable telephone (1a) is used close to the user's head (100), with the second end (20b) of the upper case (20) separated from the second end (10b) of the lower case (10). The lower case (10) is arranged with respect to the upper case (20) so that the upper case (20) may interpose between the monopole antenna (30) and the head (100).

    摘要翻译： 便携式电话（1a）包括具有第一端部（10a）和第二端部（10b）的下壳体（10），具有可转动地连接到第一壳体（10）的第一端部（20a）的上壳体（20） 第二端（20b）以及内置在下壳体（10）的第一端（10a）中的单极天线（30）。 上壳体20的第二端部20b可旋转以接近下壳体10的第二端部10b或与下壳体10的第二端部10b分离。 便携式电话（1a）靠近使用者的头部（100）使用，而上壳体（20）的第二端（20b）与下壳体（10）的第二端（10b）分离。 下壳体（10）相对于上壳体（20）布置，使得上壳体（20）可以介于单极天线（30）和头部（100）之间。

    RADIO TERMINAL DEVICE
    7.
    发明公开
    RADIO TERMINAL DEVICE 有权
    FUNKENDGERÄT

    公开(公告)号：EP1083669A4

    公开(公告)日：2003-09-03

    申请号：EP99907913

    申请日：1999-03-11

    申请人： MITSUBISHI ELECTRIC CORP

    发明人： KATSURA TAKATOSHI ,  ITOH KENJI ,  FUKUYAMA SHINJIROU ,  MOCHIZUKI MITSURU ,  NAGANO HIROAKI ,  MATSUNAMI YOSHINORI ,  SHIMOZAWA MITSUHIRO ,  ISHIZU FUMIO ,  HAYASHI RYOJI

    IPC分类号： H03D3/00 ,  H03D7/02 ,  H04B1/30 ,  H04J13/00 ,  H04L25/06 ,  H04L27/14 ,  H04L27/22

    CPC分类号： H04B1/0014 ,  H03D3/008 ,  H03D7/02 ,  H04B1/0032 ,  H04B1/0039 ,  H04B1/30 ,  H04L25/061

    摘要： A cellular telephone comprises a direct conversion receiver circuit (14) using even-harmonic quadrature mixer (24), and high-pass filters (56, 58, 64, 66) for removing DC offset components before and behind variable-gain amplifiers (60, 62) in a baseband circuit (30). The DC components appearing in the even-harmonic quadrature mixer (24) is constant, while the DC components appearing in the variable-gain amplifiers (60, 62) change with time. Therefore, the cutoff frequency of the high-pass filters (64, 66) in the back stage is set higher than the cutoff frequency (fc1) of the high-pass filters (56, 58) in the front stage so that the transient response may be fast.

    摘要翻译： 蜂窝电话包括使用偶次谐波正交混频器（24）的直接变换接收器电路（14）和用于去除可变增益放大器（60）前后的DC偏移分量的高通滤波器（56,58,64,66） ，62）在基带电路（30）中。 出现在偶次谐波正交混频器（24）中的DC分量是恒定的，而出现在可变增益放大器（60,62）中的DC分量随时间变化。 因此，将后级的高通滤波器（64,66）的截止频率设定得比前级的高通滤波器（56,58）的截止频率（fc1）高，以使瞬态响应 可能会很快。

    RADIO TERMINAL DEVICE
    8.
    发明公开
    RADIO TERMINAL DEVICE 审中-公开
    无线终端

    公开(公告)号：EP1083671A4

    公开(公告)日：2003-03-26

    申请号：EP99906461

    申请日：1999-02-24

    申请人： MITSUBISHI ELECTRIC CORP

    发明人： KATSURA TAKATOSHI ,  ITOH KENJI ,  FUKUYAMA SHINJIROU ,  MOCHIZUKI MITSURU ,  NAGANO HIROAKI ,  MATSUNAMI YOSHINORI

    IPC分类号： H04B1/48 ,  H04B1/52 ,  H04B1/40

    CPC分类号： H04B1/52 ,  H04B1/48

    摘要： A radio terminal device has a transmission circuit (10), an isolator (11), a band-pass filter (12), a changeover switch (13), a transmission antenna (14), a receiving circuit (20), a band-pass filter (21), a changeover switch (22), a receiving antenna (23), a high-pass filter (31), a low-pass filter (32), and an input/output port (41). A transmission wave of a frequency (f1) is transmitted from the transmission circuit (10) to the input/output port (41) through the isolator (11), the band-pass filter (12) and the low-pass filter (32) and is further transmitted to an on-board antenna. In this case, the transmission wave in the direction to the receiving circuit (20) is cut off by the high-pass filter (31). On the other hand, a receiving wave of a frequency (f2) from the on-board antenna is transmitted to the input/output port (41) and then transmitted to the receiving circuit (20) through the high-pass filter (31) and the band-pass filter (21). In this case, the receiving wave in the direction to the transmission circuit (10) is cut off by the low-pass filter (32). Thus, since transmission and reception can be simultaneously carried out through the single input/output port (41), the compatibility with a typical radio terminal device for simultaneously carrying out transmission and reception by one common antenna for transmission and reception is obtained.