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    ANALOGUE TO DIGITAL CONVERTER AND SIGNAL PROCESSING SYSTEM
    6.
    发明申请
    ANALOGUE TO DIGITAL CONVERTER AND SIGNAL PROCESSING SYSTEM 失效
    数字转换器和信号处理系统的模拟

    公开(公告)号：US20130076544A1

    公开(公告)日：2013-03-28

    申请号：US13425317

    申请日：2012-03-20

    申请人： Naoya Waki ,  Junya Matsuno ,  Takafumi Yamaji ,  Masanori Furuta

    发明人： Naoya Waki ,  Junya Matsuno ,  Takafumi Yamaji ,  Masanori Furuta

    IPC分类号： H03M1/06

    CPC分类号： H03M1/0626 ,  H03M1/0836 ,  H03M1/1215

    摘要： According to one embodiment, an analogue to digital converter converts an analogue input signal to a digital output signal. The converter includes an analogue to digital converting unit, a multiplexer, a pseudo-alias signal generator, a gain controller, and an alias signal compensator. The analogue to digital converting unit converts the analogue input signal to a plurality of digital signals. The multiplexer sequentially selects one of the digital signals and outputs the selected digital signal as a multiplexer output. The pseudo-alias signal generator generates a plurality of pseudo-alias signals from the digital signals. The pseudo-alias signal simulates an alias signal component in the multiplexer output. The gain controller generates a plurality of gain control signals by using the pseudo-alias signals. The gain control signal controls gain of the digital output signal. The alias signal compensator compensates the alias signal component by using the gain control signals.

    摘要翻译： 根据一个实施例，模数转换器将模拟输入信号转换成数字输出信号。 转换器包括模数转换单元，多路复用器，伪别名信号发生器，增益控制器和别名信号补偿器。 模数转换单元将模拟输入信号转换为多个数字信号。 多路复用器顺序地选择一个数字信号并输出​​所选择的数字信号作为多路复用器输出。 伪别名信号发生器从数字信号产生多个伪别名信号。 伪别名信号模拟复用器输出中的别名信号分量。 增益控制器通过使用伪别名信号来产生多个增益控制信号。 增益控制信号控制数字输出信号的增益。 别名信号补偿器通过使用增益控制信号来补偿别名信号分量。

    RADIO APPARATUS
    7.
    发明申请
    RADIO APPARATUS 有权
    无线电设备

    公开(公告)号：US20120208483A1

    公开(公告)日：2012-08-16

    申请号：US13422636

    申请日：2012-03-16

    申请人： Shoji OTAKA ,  Takafumi Yamaji ,  Tsutomu Sugawara ,  Yasuhiko Tanabe ,  Masahiro Hosoya ,  Hiroki Sakurai

    发明人： Shoji OTAKA ,  Takafumi Yamaji ,  Tsutomu Sugawara ,  Yasuhiko Tanabe ,  Masahiro Hosoya ,  Hiroki Sakurai

    IPC分类号： H04B1/16

    CPC分类号： H04W52/0274 ,  H03L7/0802 ,  H03L7/1976 ,  H03L2207/50 ,  H04L25/0292 ,  H04L27/38 ,  H04L27/3818 ,  H04W52/0229 ,  Y02D70/142

    摘要： A radio apparatus includes an antenna; an amplifier that amplifies a radio signal, received via the antenna; a first mixer that frequency converts the amplified radio signal to generate a first analog signal; a first A/D converter that converts the first analog signal to generate a first digital signal; a second mixer that frequency converts the amplified signal to generate a second analog signal; a second A/D converter means that converts the second analog signal to generate a second digital signal; a demodulator means that demodulates the first and second digital signals to generate a demodulated signal; a detector that detects a preamble from the first digital signal; and a control means that halts the second mixer and second A/D converter during the wait for the radio signal and that activates the second mixer and second A/D converter when the detector detects the preamble.

    摘要翻译： 无线电设备包括天线; 放大器，放大经由天线接收的无线电信号; 第一混频器，其对放大的无线电信号进行频率转换以产生第一模拟信号; 第一A / D转换器，其转换第一模拟信号以产生第一数字信号; 第二混频器，其对放大的信号进行频率转换以产生第二模拟信号; 第二A / D转换器，用于转换第二模拟信号以产生第二数字信号; 解调器装置，解调第一和第二数字信号以产生解调信号; 检测器，其从所述第一数字信号检测前导码; 以及控制装置，其在等待无线电信号期间停止第二混频器和第二A / D转换器，并且当检测器检测到前导码时激活第二混频器和第二A / D转换器。

    A/D converting apparatus
    8.
    发明授权
    A/D converting apparatus 失效
    A / D转换装置

    公开(公告)号：US07884749B2

    公开(公告)日：2011-02-08

    申请号：US12349180

    申请日：2009-01-06

    申请人： Masanori Furuta ,  Tomohiko Ito ,  Takafumi Yamaji ,  Tetsuro Itakura

    发明人： Masanori Furuta ,  Tomohiko Ito ,  Takafumi Yamaji ,  Tetsuro Itakura

    IPC分类号： H03M1/38

    CPC分类号： H03M1/1215 ,  H03M1/162 ,  H03M1/164 ,  H03M1/468

    摘要： An A/D converting apparatus includes a first A/D converter to sample an analog input signal having a D/A converter to generate a comparative signal for successive comparison with the analog input signal, a signal generator generate a differential signal between the analog input signal and the comparative signal, and a comparator to compare the comparative signal with a standard value to generate a first digital signal exhibiting high-order bit; an amplifier to amplify the differential signal to generate a residue signal; and a second A/D converter to sample the residue signal to generate a second digital signal exhibiting low-order bit.

    摘要翻译： A / D转换装置包括：第一A / D转换器，对具有D / A转换器的模拟输入信号进行采样以产生用于与模拟输入信号连续比较的比较信号，信号发生器在模拟输入端之间产生差分信号 信号和比较信号，以及比较器，用于将比较信号与标准值进行比较，以产生呈现高位的第一数字信号; 放大器，用于放大差分信号以产生残余信号; 以及第二A / D转换器，用于对残留信号进行采样以产生呈现低阶位的第二数字信号。

    Digital/analog converter and transmitter for complex signals
    9.
    发明授权
    Digital/analog converter and transmitter for complex signals 失效
    数字/模拟转换器和发射机用于复杂信号

    公开(公告)号：US07710301B2

    公开(公告)日：2010-05-04

    申请号：US11755872

    申请日：2007-05-31

    申请人： Takeshi Ueno ,  Takafumi Yamaji

    发明人： Takeshi Ueno ,  Takafumi Yamaji

    IPC分类号： H03M1/66

    CPC分类号： H03M1/662 ,  H04B1/0483 ,  H04B14/04

    摘要： According to an embodiment of the invention, there is provided a digital/analog converter includes: a decoder that converts a (n−1)-phase input digital signal to a n-phase output digital signal; and a signal generating unit that generates analog signals according to the n-phase output digital signal.

    摘要翻译： 根据本发明的实施例，提供一种数字/模拟转换器，包括：将（n-1）相输入数字信号转换为n相输出数字信号的解码器; 以及根据n相输出数字信号产生模拟信号的信号产生单元。

    A/D converter, signal processor, and receiving device
    10.
    发明授权
    A/D converter, signal processor, and receiving device 失效
    A / D转换器，信号处理器和接收装置

    公开(公告)号：US07522080B2

    公开(公告)日：2009-04-21

    申请号：US12055850

    申请日：2008-03-26

    申请人： Takafumi Yamaji

    发明人： Takafumi Yamaji

    IPC分类号： H03M3/00

    CPC分类号： H03M3/354 ,  H03M3/41 ,  H03M3/422 ,  H03M3/464

    摘要： An A/D converter which converts an analog current signal into a digital signal, includes: a filter removing a noise component from the analog current signal to output an analog voltage signal; a quantizer quantizing the analog voltage signal outputted from the filter to generate the digital signal; and a D/A converter converting the digital signal generated by the quantizer into an analog feedback current to feedback to an input of the filter, and supplying a bias current for the D/A converter to an output of a frequency converter via a path of the analog current signal as a bias current driving the frequency converter outputting the analog current signal.

    摘要翻译： 一种将模拟电流信号转换为数字信号的A / D转换器，包括：滤波器，从模拟电流信号中去除噪声分量，以输出模拟电压信号; 量化器，对从滤波器输出的模拟电压信号进行量化以产生数字信号; 以及D / A转换器，其将由量化器产生的数字信号转换成模拟反馈电流以反馈到滤波器的输入端，并且通过经过路径的D / A转换器的输出向D / A转换器提供偏置电流 模拟电流信号作为驱动变频器的偏置电流输出模拟电流信号。