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公开(公告)号：US5079513A
公开(公告)日：1992-01-07
申请号：US612982
申请日：1990-11-15
IPC分类号： H04L27/22 , H03D3/00 , H04L27/14 , H04L27/152 , H04L27/233
CPC分类号： H04L27/2332 , H03D3/008 , H04L27/1525 , H03D2200/0025 , H03D2200/0035 , H03D2200/005 , H03D3/006
摘要： The invention relates to a demodulator and to a radio receiver having such a demodulator and, more particularly, to a demodulator for demodulating signals which were digitized by a direct detecting method in which a circuit scale is small and an electric power consumption is small. Particularly, it is a characteristic that a limiter in the demodulator comprises: a circuit for obtaining absolute values of the digital signals (I signal, Q signal) which are produced from an angle modulated wave and whose phases are mutually orthogonal; a circuit for outputting the sum (.vertline.I.vertline.+.vertline.Q.vertline.) of the absolute values or the larger one M(.vertline.I.vertline., .vertline.Q.vertline.) of the absolute values; a controller for producing a control signal according to an output of the above circuit; and scalers which change the amplitudes of the first and second digital signals in accordance with the control signal and which are constructed by a plurality of shift registers and adders.
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2.发明授权Method of controlling filter time constant and filter circuit having the time constant control function based on the method 失效基于该方法控制滤波时间常数的方法和具有时间常数控制功能的滤波电路
公开(公告)号：US5392456A
公开(公告)日：1995-02-21
申请号：US592340
申请日：1990-10-03
申请人： Isamu Mitomo , Nobuo Tsukamoto , Arata Nakagoshi , Jiroh Sakaguchi , Kazuo Yamakido , Hiroshi Noguchi , Atushi Hoshi
发明人： Isamu Mitomo , Nobuo Tsukamoto , Arata Nakagoshi , Jiroh Sakaguchi , Kazuo Yamakido , Hiroshi Noguchi , Atushi Hoshi
CPC分类号： H03H11/1291
摘要： A method of controlling the time constant of a filter for use in a radio receiver which receives a signal, transmitted from a transmitting station at a predetermined period, intermittently at the predetermined period and demodulates and delivers the received signal, a filter circuit having the time constant control function based on the method, and a radio receiver having the filter circuit. Preferably, the filter has its time constant switchable stepwise and specifically, parallel connection of capacitors or shortcircuiting of resistors is controlled by turning on/off switches. A controller within the filter circuit or the radio receiver performs control for applying a predetermined periodical signal (or standard pulse signal) to the filter and controlling the time constant of the filter in accordance with an output signal (or triangular pulse) during a first time zone within each operation interval for the intermittent reception and for filtering the signal from the transmitting station and causing a demodulating circuit to demodulate and deliver a filtered signal.
摘要翻译： 一种控制无线电接收机中使用的滤波器的时间常数的方法，该无线电接收机接收以预定周期从发送站以预定周期间歇地发送的信号，并且对接收到的信号进行解调和传送，具有时间 基于该方法的恒定控制功能和具有滤波器电路的无线电接收机。 优选地，该滤波器的时间常数可逐步切换，具体地说，通过接通/断开开关来控制电容器的并联或电阻的短路。 滤波器电路或无线电接收机内的控制器执行用于将预定周期信号（或标准脉冲信号）施加到滤波器的控制，并且在第一时间内根据输出信号（或三角波脉冲）控制滤波器的时间常数 在间歇接收的每个操作间隔内，对来自发送站的信号进行滤波，并使解调电路解调并传送滤波信号。
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公开(公告)号：US08228970B2
公开(公告)日：2012-07-24
申请号：US12213881
申请日：2008-06-25
IPC分类号： H04B1/00
CPC分类号： H04B1/707
摘要： There is provided a signal processing device and a wireless apparatus capable of not erroneously determining polarity, appropriately performing a spread modulation process, a carrier modulation process, and reception data demodulation process, improving reception accuracy, and miniaturizing a circuit, even when IF carrier frequency shift occurs. The signal processing device and the wireless apparatus includes a spread modulation unit which includes a first differential encoding process section for performing a differential encoding process on a reception data, a differential encoding process section for performing a second differential encoding process on the output, and a spread modulation process section for performing a spread modulation process on the output using a spread code; a carrier modulation unit which quadrature-modulates a transmission data spread modulation signal and a continuous wave; and a reception data decoding unit which performs a correlation process twice and a delay detection process twice.
摘要翻译： 提供了一种能够不错误地确定极性的信号处理装置和无线装置，适当地执行扩频调制处理，载波调制处理和接收数据解调处理，提高接收精度和使电路小型化，即使在IF载波频率 班次发生。 信号处理装置和无线装置包括扩展调制部，其包括对接收数据进行差分编码处理的第一差分编码处理部，对输出进行第二差分编码处理的差分编码处理部， 扩展调制处理部分，用于使用扩展码对输出进行扩展调制处理; 载波调制单元，对发送数据扩展调制信号和连续波进行正交调制; 以及接收数据解码单元，其执行两次相关处理和延迟检测处理两次。
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公开(公告)号：US07899633B2
公开(公告)日：2011-03-01
申请号：US12154941
申请日：2008-05-28
申请人： Nobuo Tsukamoto , Kazuo Akaike , Tsukasa Kobata
发明人： Nobuo Tsukamoto , Kazuo Akaike , Tsukasa Kobata
IPC分类号： G01N23/00
CPC分类号： G01N11/16 , G01G3/13 , G01N29/036 , G01N29/4472 , G01N2291/0256 , G01N2291/02809
摘要： An object of the present invention is to provide a sensing instrument capable to detect a substance existing in a very small quantity, such as environmental pollutants, instantly with a high degree of precision. As a specific means for solving the problem, a frequency signal from a crystal oscillator is sampled using a frequency signal from a reference clock generating part, the sampling value is outputted in a digital signal, quadrature detection is conducted with the digital signal for a frequency signal corresponding to the output signal, the rotational vector rotating at a frequency corresponding to the difference between the frequency of the frequency signal and the frequency of a sinusoidal wave used for the quadrature detection is taken out, and the variation of the frequency is detected by detecting the velocity of the rotational vector based on the respective sampling values. In addition to that, the measurement range of the variation of frequency can be widened by multiplying the above-described rotational vector by the reversely rotational vector corresponding to the velocity of the rotational vector.
摘要翻译： 本发明的目的是提供一种能够以高精度立即检测诸如环境污染物等非常少的物质的感测装置。 作为解决该问题的具体手段，使用来自基准时钟生成部的频率信号对来自晶体振荡器的频率信号进行采样，以数字信号输出采样值，利用数字信号进行频率正交检波 对应于输出信号的信号，取出以与频率信号的频率和用于正交检测的正弦波的频率之间的差相对应的频率旋转的旋转矢量，并且频率的变化由 基于相应的采样值来检测旋转矢量的速度。 除此之外，通过将上述旋转矢量乘以与旋转矢量的速度对应的反向旋转矢量，可以扩大频率变化的测量范围。
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公开(公告)号：US07825701B2
公开(公告)日：2010-11-02
申请号：US12225563
申请日：2007-03-14
CPC分类号： H03L7/18 , H03L7/085 , H03L7/091 , H03L7/10 , H03L7/185 , H03L7/187 , H03L2207/06 , H03L2207/12
摘要： An object of the present invention provides a frequency synthesizer having a broad frequency entraining range which can finely set a frequency over a broad band by a novel principle.As s specific solving means, a sinusoidal signal of an output frequency of a voltage-controlled oscillator is subjected to orthogonal detection, a vector rotating at the differential frequency (speed) between the output frequency and the frequency of the frequency signal used for the detection is created, and the frequency of a vector when the output frequency of the voltage-controlled oscillator is equal to a set value is calculated in advance. The voltage signal corresponding to the difference between the frequency of the vector and the calculated frequency is fed back to the voltage-controlled oscillator when the voltage-controlled oscillator is driven, and PLL is formed so that the difference is equal to zero. Accordingly, the output frequency of the voltage-controlled oscillator is adjusted to the set frequency when PLL is locked. After the difference between both the frequencies is increased after PLL is locked, the set value is integrated by the integrating circuit portion and added to the control voltage.
摘要翻译： 本发明的目的是提供一种频率合成器，其具有宽的频率夹带范围，可通过新的原理在宽带上精细地设定频率。 作为具体的解决方法，对压控振荡器的输出频率的正弦信号进行正交检测，以用于检测的频率信号的输出频率和频率之间的差分频率（速度）旋转的矢量 并且预先计算当压控振荡器的输出频率等于设定值时的矢量频率。 当驱动压控振荡器时，与矢量频率和计算出的频率之间的差值相对应的电压信号被反馈到压控振荡器，并且形成PLL，使得差值等于零。 因此，当PLL被锁定时，压控振荡器的输出频率被调整到设定频率。 在PLL被锁定之后两个频率之间的差异增加之后，设定值被积分电路部分积分并加到控制电压上。
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公开(公告)号：US20090039973A1
公开(公告)日：2009-02-12
申请号：US12219452
申请日：2008-07-22
申请人： Yasuo Kitayama , Hiroki Kimura , Naoki Onishi , Nobuo Tsukamoto
发明人： Yasuo Kitayama , Hiroki Kimura , Naoki Onishi , Nobuo Tsukamoto
IPC分类号： H03B5/08
摘要： A VCO driving circuit and a frequency synthesizer wherein the impedance viewed from a VCO control terminal is reduced to prevent the VCO phase noise characteristic from degrading. A VCO driving circuit and a frequency synthesizer having the VCO driving circuit, which comprises a coarse adjustment DAC that receives a digital data, which has a coarse adjustment frequency, to output an analog signal; a fine adjustment DAC that receives a digital data, which has a fine adjustment frequency, to output an analog signal; a low response speed LPF5 that removes noise from the output signal from the coarse adjustment DAC and then provides the resultant signal as an input to a VCO control terminal; a high response speed LPF7 that converts the output signal from the fine adjustment DAC to a voltage, thereby smoothing the signal; a resistor that connects an input stage of the LPF5 to that of the LPF7; and a capacitor used for providing a capacitive coupling such that the output of the LPF7 is added to that of the LPF5.
摘要翻译： VCO驱动电路和频率合成器，其中从VCO控制端子观察的阻抗减小，以防止VCO相位噪声特性降级。 VCO驱动电路和具有VCO驱动电路的频率合成器，其包括具有粗略调整频率的接收数字数据的粗调DAC以输出模拟信号; 微调DAC，其接收具有微调频率的数字数据，以输出模拟信号; 低响应速度LPF5，其从粗调DAC输出信号中去除噪声，然后将所得到的信号作为输入提供给VCO控制端; 高响应速度LPF7，其将来自微调DAC的输出信号转换为电压，从而平滑信号; 将LPF5的输入级与LPF7的输入级连接的电阻; 以及用于提供电容耦合的电容器，使得LPF7的输出被添加到LPF5的输出。
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7.发明授权Data transmission system, data transmission communication station, and data transmission method 失效数据传输系统，数据传输通信站和数据传输方式公开(公告)号：US06813326B1
公开(公告)日：2004-11-02
申请号：US09394276
申请日：1999-09-10
申请人： Atsushi Miyashita , Toshiyuki Akiyama , Seiichi Sano , Hisao Koda , Itsuo Ishida , Hiroyuki Takesue , Tatsuhiro Nakada , Nobuo Tsukamoto
发明人： Atsushi Miyashita , Toshiyuki Akiyama , Seiichi Sano , Hisao Koda , Itsuo Ishida , Hiroyuki Takesue , Tatsuhiro Nakada , Nobuo Tsukamoto
IPC分类号： H04L704
摘要： A data transmission system for transmitting data from a transmitter to a receiver located away therefrom. The transmitter includes circuitry for transmitting together a main signal having a carrier modulated with main data to be transmitted and as well as a sub-signal to be used in frequency conversion and generated by modulating a carrier of a predetermined frequency out of a frequency band of the main signal. The receiver includes circuitry for receiving a receive signal from the transmitter and extracting the sub-signal therefrom and also includes circuitry for generating a signal to be used as a reference at the time of converting the receive signal to a signal having a predetermined frequency on the basis of the extracted sub-signal.
摘要翻译： 一种数据传输系统，用于将数据从发射机发射到远离其的接收机。 发射机包括用于将具有被发送的主数据调制的载波的主信号和用于频率转换的子信号一起发送的电路，并且通过调制来自频率的频带中的预定频率的载波 主要信号。 接收机包括用于从发射机接收接收信号并从其中提取子信号的电路，还包括用于产生在将接收信号转换成具有预定频率的信号时用作参考的信号的电路， 提取的子信号的基础。
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公开(公告)号：US06512798B1
公开(公告)日：2003-01-28
申请号：US09262840
申请日：1999-03-05
IPC分类号： H04L512
CPC分类号： H04L27/2071 , H04L25/03834
摘要： A digital signal communication system includes a transmission circuit or a receiving circuit for digitally transmitting two types of signals by orthogonal modulation. The transmission circuit includes an orthogonal modulator and a nonrecursive digital low-pass filter having the same frequency characteristic as a predetermined frequency characteristic of the output signal of the orthogonal modulator. The receiving circuit includes an orthogonal demodulator and a nonrecursive digital low-pass filter having the same frequency characteristic as a predetermined frequency characteristic of the output signal of the orthogonal demodulator. The total number of taps required for determining the frequency characteristic of the nonrecursive digital low-pass filter is set to H, and the series of tap coefficients is set as C1, C2, C3, . . . , CH, where H is an arbitrary positive integer of not less than 2. The nonrecursive digital low-pass filters include a first low-pass filter for filtering one of the two types of signal and a second low-pass filter for filtering the other type of the signal. The first low-pass filter has taps about one half of H including a tap coefficient series C1, C3, C5, . . . , CODD, and the second low-pass filter has taps about one half of H including a tap coefficient series C2, C4, C6, . . . , CEVEN.
摘要翻译： 数字信号通信系统包括用于通过正交调制数字地发送两种类型的信号的发送电路或接收电路。 发送电路包括具有与正交调制器的输出信号的预定频率特性相同的频率特性的正交调制器和非递归数字低通滤波器。 接收电路包括具有与正交解调器的输出信号的预定频率特性相同的频率特性的正交解调器和非递归数字低通滤波器。 用于确定非递归数字低通滤波器的频率特性所需的抽头总数设置为H，并且抽头系数串被设置为C1，C2，C3。 。 。 ，CH，其中H是不小于2的任意正整数。非递归数字低通滤波器包括用于对两种类型的信号中的一种进行滤波的第一低通滤波器和用于滤除另一种信号的第二低通滤波器 信号类型。 第一个低通滤波器具有大约H的一半的抽头，包括抽头系数C1，C3，C5。 。 。 ，CODD，第二低通滤波器具有大约H的一半的抽头，包括抽头系数C2，C4，C6。 。 。 ，CEVEN。
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9.发明授权OFDM modulator and OFDM modulation method for digital modulated wave having guard interval 失效具有保护间隔的数字调制波的OFDM调制器和OFDM调制方法公开(公告)号：US06304611B1
公开(公告)日：2001-10-16
申请号：US09099390
申请日：1998-06-18
IPC分类号： H04K110
CPC分类号： H04L27/2607 , H04L27/2626
摘要： An orthogonal frequency division multiplex (OFDM) modulator of such a system as to add guard intervals to a temporal waveform generated by modulating an input data train into a large number of (sub)carriers, conducting quadrature modulation, and outputting an OFDM signal. The OFDM modulator includes an IFFT circuit for conducting inverse fast Fourier transform processing to modulate the input data train into a large number of (sub)carriers, a guard interval adder for adding a guard interval to each effective symbol duration of a composite carrier signal supplied from the IFFT circuit and outputting a resultant signal, a control signal generator for generating, in synchronism with each guard interval of the composite carrier signal having the guard intervals added thereto, such a control signal as to attenuate signal amplitude of the composite carrier signal over an interval substantially equal in length to each guard interval; and an amplitude controller, responsive to the control signal, to attenuate the amplitude of the composite carrier signal supplied from the guard interval adder and output a resultant signal, only over an interval substantially equal in length to each guard interval. The amplitude controller outputting, in remaining intervals, the composite carrier signal supplied from the guard interval adder as it is.
摘要翻译： 这种系统的正交频分复用（OFDM）调制器，用于通过将输入数据串调制成大量（子）载波，进行正交调制并输出OFDM信号而产生的时间波形增加保护间隔。 OFDM调制器包括用于进行快速傅立叶逆变换逆变换处理以将输入数据串调制成大量（子）载波的IFFT电路，用于将提供的复合载波信号的每个有效符号持续时间加上保护间隔的保护间隔加法器 从IFFT电路输出结果信号，控制信号发生器，与与其相加的保护间隔的复合载波信号的每个保护间隔同步地产生一个控制信号，以便衰减复合载波信号的信号幅度 长度与每个保护间隔基本相等的间隔; 以及振幅控制器，响应于控制信号，衰减从保护间隔加法器提供的复合载波信号的振幅，并输出结果信号，仅在长度上与每个保护间隔基本相等的间隔上。 幅度控制器以剩余的间隔输出从保护间隔加法器原样提供的复合载波信号。
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公开(公告)号：US5128981A
公开(公告)日：1992-07-07
申请号：US526246
申请日：1990-05-21
CPC分类号： H04W84/16 , H04M1/663 , H04M1/72566 , H04M1/733 , H04M1/6505 , H04M11/022 , H04M19/045 , H04M3/533
摘要： This invention proposes a radio communication system including a plurality of radio terminals, a relay apparatus (including a plurality of base stations and an exchange station) connected to each radio terminal so that the radio terminals can interchange information from each other, and a data processing unit connected to the relay apparatus, each radio terminal having a circuit for inputting and outputting a voice signal and a circuit for inputting and outputting data whereby it can communicate with another radio terminals or with the data processing unit through the relay apparatus. The radio terminal of this invention further has a clock, and a circuit for storing a schedule inputted by the user thereby to automatically select a receiving mode such as a ringing mode or a nonringing mode in accordance with the contents of the schedule, the present time and so on.
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