公开(公告)号：US07133481B2

公开(公告)日：2006-11-07

申请号：US10311638

申请日：2002-04-05

申请人： Hiroshi Azakami ,  Takaaki Konishi ,  Hisaya Kato ,  Naoya Tokunaga ,  Kazuaki Suzuki ,  Kazuya Ueda

发明人： Hiroshi Azakami ,  Takaaki Konishi ,  Hisaya Kato ,  Naoya Tokunaga ,  Kazuaki Suzuki ,  Kazuya Ueda

IPC分类号： H04L7/00

CPC分类号： H04N5/211 ,  H04H40/18 ,  H04L7/042 ,  H04L7/06 ,  H04L27/02 ,  H04N5/08

摘要： An input signal DT contains a segment synchronization signal compliant with the ATSC standard. A clock multiplication section 111 multiplies a clock CK. A switchable sampling section 112 selects a sample point from among a plurality of timing points that are defined by the multiplied clock, and samples the input signal DT at the selected sample point. Moreover, the switchable sampling section 112 switches sample points from one to another in a synchronization-unestablished state. Once the segment synchronization is established, a synchronization detection device may maintain a synchronization-established state until the field synchronization detection fails, or the synchronization detection device may output a synchronization detection signal after shifting it in the time direction based on a bit error rate RT of the input signal.

摘要翻译： 输入信号DT包含符合ATSC标准的片段同步信号。 时钟倍增部分111将时钟CK相乘。 可切换取样部112从由倍增时钟定义的多个定时点中选择采样点，并对选择的采样点对输入信号DT进行采样。 此外，可切换采样部112在同步未建立状态下将采样点从一个切换到另一个。 一旦段同步建立，同步检测装置可以保持同步建立状态，直到现场同步检测失败，或者同步检测装置可以在基于位错误率RT在时间方向上移动同步检测信号之后输出同步检测信号 的输入信号。

公开(公告)号：US06934522B2

公开(公告)日：2005-08-23

申请号：US09886377

申请日：2001-06-22

申请人： Takaaki Konishi ,  Hiroshi Azakami ,  Kazuya Ueda ,  Naoya Tokunaga ,  Hisaya Kato ,  Hiroaki Ozeki

发明人： Takaaki Konishi ,  Hiroshi Azakami ,  Kazuya Ueda ,  Naoya Tokunaga ,  Hisaya Kato ,  Hiroaki Ozeki

IPC分类号： H03G3/20 ,  H03G1/04 ,  H04B1/28 ,  H04B1/06

CPC分类号： H03G1/04 ,  H04B1/28

摘要： In an automatic gain control amplifier, an RF automatic gain controller controls the gain of a radio frequency signal. A frequency converter frequency-converts the radio frequency signal into an intermediate frequency signal. An IF automatic gain controller controls the gain of the intermediate frequency. A level detector detects a signal level of the gain-controlled intermediate frequency signal, and generates a level signal. An automatic gain control signal generator separately controls, based the level signal, the RF automatic gain controller and the IF automatic gain controller.

摘要翻译： 在自动增益控制放大器中，RF自动增益控制器控制射频信号的增益。 变频器将射频信号频率转换成中频信号。 中频自动增益控制器控制中频增益。 电平检测器检测增益控制中频信号的信号电平，并产生电平信号。 自动增益控制信号发生器基于电平信号单独控制RF自动增益控制器和IF自动增益控制器。

公开(公告)号：US07054395B2

公开(公告)日：2006-05-30

申请号：US09853682

申请日：2001-05-14

申请人： Hiroshi Azakami ,  Takaaki Konishi ,  Hisaya Kato ,  Naoya Tokunaga ,  Hiroaki Ozeki ,  Kazuya Ueda

发明人： Hiroshi Azakami ,  Takaaki Konishi ,  Hisaya Kato ,  Naoya Tokunaga ,  Hiroaki Ozeki ,  Kazuya Ueda

IPC分类号： H04L27/08

CPC分类号： H03G3/3089

摘要： A digital demodulation apparatus automatically controls gain based on a state of receiving a digital modulated signal. The digital demodulation apparatus amplifies a digital modulated signal wave received through the air with the gain automatically controlled so as to have a predetermined amplitude. In the digital demodulation apparatus, a receive level variation detector detects receive level variation, an amount of noise components of the received digital signal wave. A gain controller 15 controls the gain with a receive level variation adaptive control signal based on the detected receive level variation, the amount of noise components.

摘要翻译： 数字解调装置根据接收数字调制信号的状态自动控制增益。 数字解调装置以自动控制的增益放大通过空气接收的数字调制信号波，以具有预定的幅度。 在数字解调装置中，接收电平变化检测器检测接收电平变化，接收的数字信号波的噪声分量的量。 增益控制器15基于检测到的接收电平变化，噪声分量的量，利用接收电平变化自适应控制信号来控制增益。

公开(公告)号：US07302021B2

公开(公告)日：2007-11-27

申请号：US09878427

申请日：2001-06-12

申请人： Takaaki Konishi ,  Hiroshi Azakami ,  Kazuya Ueda ,  Naoya Tokunaga

发明人： Takaaki Konishi ,  Hiroshi Azakami ,  Kazuya Ueda ,  Naoya Tokunaga

IPC分类号： H04L27/08

CPC分类号： H04N5/4446 ,  H03G3/3068 ,  H03G3/3089 ,  H04H40/18 ,  H04N5/4401 ,  H04N5/50 ,  H04N5/52 ,  H04N21/42607

摘要： In a digital broadcast receiving apparatus for amplifying a received modulated digital signal wave with automatically adjusted gain and demodulating the modulated signal wave to a digital signal, a tuner frequency-converts the modulated digital signal wave to generate a first modulated signal. A first automatic gain control amplification unit controls gain of the tuner to make a level of the first modulated signal at a first predetermined level. An A/D converter converts the first modulated signal into a second modulated signal. A demodulator demodulates the second modulated signal to generate a first demodulated digital signal. A second automatic gain control amplifier generates a second demodulated digital signal where frequency fluctuations included in the digital modulated wave are eliminated.

摘要翻译： 在一种数字广播接收装置中，用于利用自动调节增益放大接收到的调制数字信号波并将调制信号波解调为数字信号，调谐器对调制数字信号波进行频率转换以产生第一调制信号。 第一自动增益控制放大单元控制调谐器的增益使第一调制信号的电平达到第一预定电平。 A / D转换器将第一调制信号转换成第二调制信号。 解调器解调第二调制信号以产生第一解调数字信号。 第二自动增益控制放大器产生第二解调数字信号，其中消除了数字调制波中包括的频率波动。

公开(公告)号：US06671002B1

公开(公告)日：2003-12-30

申请号：US09555150

申请日：2000-08-07

申请人： Takaaki Konishi ,  Kazuya Ueda ,  Hiroshi Azakami

发明人： Takaaki Konishi ,  Kazuya Ueda ,  Hiroshi Azakami

IPC分类号： H04N544

CPC分类号： H04N5/4401 ,  H03G3/3052 ,  H03G3/3078 ,  H03L7/107 ,  H04L27/08 ,  H04N5/211 ,  H04N5/52

摘要： The loop gain of an AGC circuit 7 and the loop gain of a clock regenerating circuit 6 are increased (the gain of an amplifier is increased, or the band of a loop filter is widened) until a synchronizing signal (a segment synchronizing signal or a field synchronizing signal) is detected. The loop gain of the AGC circuit 7 and the loop gain of the clock regenerating circuit 6 are decreased (the gain of the amplifier is decreased, or the band of the loop filter is narrowed) after the synchronizing signal is detected. Consequently, it is possible to make a reduction of a time period required until convergence processing is completed in the AGC circuit and the clock regenerating circuit compatible with an improvement of a ghost disturbance removal performance and accurate clock regeneration.

摘要翻译： AGC电路7的环路增益和时钟再生电路6的环路增益增加（放大器的增益增加或环路滤波器的频带被加宽），直到同步信号（段同步信号或 场同步信号）。 在检测到同步信号之后，AGC电路7的环路增益和时钟再生电路6的环路增益被减小（放大器的增益减小或环路滤波器的频带变窄）。因此， 可以减少在AGC电路和时钟再生电路中的会聚处理完成所需的时间段，其与改善重影干扰去除性能和精确的时钟再生相兼容。

公开(公告)号：US6075829A

公开(公告)日：2000-06-13

申请号：US865829

申请日：1997-05-30

申请人： Yoshikazu Hayashi ,  Noriaki Omoto ,  Takaaki Konishi ,  Hiroshi Azakami ,  Takashi Hasegawa

发明人： Yoshikazu Hayashi ,  Noriaki Omoto ,  Takaaki Konishi ,  Hiroshi Azakami ,  Takashi Hasegawa

IPC分类号： H04H40/18 ,  H04L27/06

CPC分类号： H04H40/18 ,  H03B5/1203 ,  H03B5/1231 ,  H03B5/1243 ,  H03D3/007 ,  H03J1/005 ,  H03L7/18

摘要： A digital broadcast receiver for receiving a digital modulation signal of the present invention includes channel selection means inputting a digital modulation signal of a radio frequency band and frequency converting a desired digital modulation signal into a designated intermediate frequency signal; oscillation means for generating a local oscillation signal used for frequency conversion at the channel selection means; oscillation frequency control means for controlling a frequency of the local oscillation signal at the oscillation means; phase noise characteristic control means for improving a phase noise characteristic of the local oscillation signal generated at the oscillation means; filter means for extracting the intermediate frequency signal selected at channel selection means; orthogonal detection means for orthogonally detecting the intermediate frequency signal extracted at the filter means; A/D converter means for converting the analog output of the orthogonal detection means into a digital signal; and digital demodulation means for digitally demodulating the output of the A/D converter means; and makes a high performance digital reception possible which can improve an AFC function by the channel selection means and can improve a bit error rate at the same time.

摘要翻译： 用于接收本发明的数字调制信号的数字广播接收机包括：信道选择装置，输入无线电频带的数字调制信号，并将期望的数字调制信号频率转换成指定的中频信号; 用于在频道选择装置处产生用于频率转换的本地振荡信号的振荡装置; 振荡频率控制装置，用于控制振荡装置处的本地振荡信号的频率; 相位噪声特性控制装置，用于改善在振荡装置产生的本地振荡信号的相位噪声特性; 滤波器装置，用于提取在频道选择装置处选择的中频信号; 正交检测装置，用于正交检测在滤波装置处提取的中频信号; A / D转换装置，用于将正交检测装置的模拟输出转换成数字信号; 以及数字解调装置，用于数字解调A / D转换装置的输出; 并且可以实现高性能数字接收，这可以通过信道选择装置改善AFC功能，并且可以同时提高误码率。

公开(公告)号：US06914945B2

公开(公告)日：2005-07-05

申请号：US09883174

申请日：2001-06-19

申请人： Hisaya Kato ,  Ippei Kanno ,  Hiroshi Azakami

发明人： Hisaya Kato ,  Ippei Kanno ,  Hiroshi Azakami

IPC分类号： H04N5/06 ,  H04J3/00 ,  H04L7/00 ,  H04L7/027 ,  H04L27/06 ,  H04N5/455 ,  H04N19/00 ,  H04N19/80 ,  H04L27/16

CPC分类号： H04L7/027 ,  H04L7/0008

摘要： In a clock recovery circuit for DTV using a VSB modulation method, if the frequency of the symbol clock is fs, since the frequency difference between the fs/2 component signal of the VSB signal and the pilot signal is constant at fs/2, it is possible accurately to detect the phase error from their differential signal. Furthermore there is no distortion of the clock signal frequency of the VSB signal, even when the symbol data is distorted by multi-pass distortion or the like, since clock signal regeneration is performed by frequency domain processing. By employing this type of principle and performing phase error detection for each symbol at a time, it is possible to ensure a high speed tracking performance for clock signal regeneration.

摘要翻译： 在使用VSB调制方法的DTV的时钟恢复电路中，如果符号时钟的频率为fs，则由于VSB信号的fs / 2分量信号与导频信号之间的频率差在fs / 2是恒定的，所以 可以准确地从其差分信号中检测相位误差。 此外，即使当通过频域处理执行时钟信号再生时，即使当多通道失真等使码元数据失真时，也不会产生VSB信号的时钟信号频率的失真。 通过采用这种原理并一次执行每个符号的相位误差检测，可以确保用于时钟信号再生的高速跟踪性能。

公开(公告)号：US6072999A

公开(公告)日：2000-06-06

申请号：US829978

申请日：1997-04-01

申请人： Takaaki Konishi ,  Noriaki Omoto ,  Yoshikazu Hayashi ,  Hiroshi Azakami

发明人： Takaaki Konishi ,  Noriaki Omoto ,  Yoshikazu Hayashi ,  Hiroshi Azakami

IPC分类号： H01P1/203 ,  H01P1/205 ,  H03H7/01 ,  H04B1/10

CPC分类号： H01P1/20336

摘要： A receiving apparatus is presented, in which a channel frequency can be selected over a wide band with an increased attenuation at an image frequency and/or at a local oscillation frequency by including a tunable filter having a following construction. Microstrip lines are connected between either one of the input or the output terminal or both of the input and output terminals of the tunable filter; a plurality of resonant circuits are formed by each of a plurality of coils and a plurality of variable capacitance diodes; and the coils are electromagnetically coupled and where a voltage applied to each cathode of each of a plurality of variable capacitance diodes through each of a plurality of resistors is controlled to tune a frequency to be received.

摘要翻译： 提出了一种接收装置，其中可以通过包括具有以下结构的可调谐滤波器在宽频带上选择具有在图像频率和/或本地振荡频率处的增加的衰减的信道频率。 微带线连接在可调谐滤波器的输入或输出端子之一或输入和输出端子之间; 由多个线圈和多个可变电容二极管中的每一个形成多个谐振电路; 并且线圈被电磁耦合，并且其中通过多个电阻器中的每一个施加到多个可变电容二极管中的每一个的每个阴极的电压被控制以调谐待接收的频率。

公开(公告)号：US08165192B2

公开(公告)日：2012-04-24

申请号：US12304041

申请日：2007-10-19

申请人： Yousuke Kimura ,  Haruka Takano ,  Hiroshi Azakami

发明人： Yousuke Kimura ,  Haruka Takano ,  Hiroshi Azakami

IPC分类号： H03H7/30 ,  H04B1/38 ,  H03G11/04

CPC分类号： H04B3/142 ,  H04L25/03038 ,  H04L25/03057 ,  H04L27/06 ,  H04L2025/03382 ,  H04L2025/03503 ,  H04L2025/03687 ,  H04L2025/037

摘要： Tap coefficients of an FIR filter are prevented from converging to wrong values. A waveform equalizer for performing waveform equalization of an input signal and outputting a waveform equalization result as an output signal includes: an FIR filter for performing a convolution operation between the input signal and a plurality of tap coefficients; an IIR filter for performing a convolution operation between the output signal and a plurality of tap coefficients; an adding section for adding an operation result of the FIR filter and an operation result of the IIR filter and outputting an addition result as the output signal; an error detecting section for detecting an error of the output signal; and a tap coefficient updating section for updating respective tap coefficients of the FIR filter and the IIR filter based on the error. The tap coefficient updating section sets a step size for updating the tap coefficients of the FIR filter to a value smaller than a step size for updating the tap coefficients of the IIR filter during a period from start of operation of the waveform equalizer until a predetermined condition is satisfied.

摘要翻译： 阻止FIR滤波器的抽头系数收敛到错误的值。 用于执行输入信号的波形均衡并输出波形均衡结果作为输出信号的波形均衡器包括：FIR滤波器，用于在输入信号和多个抽头系数之间执行卷积运算; 用于执行输出信号和多个抽头系数之间的卷积运算的IIR滤波器; 添加部分，用于添加FIR滤波器的运算结果和IIR滤波器的运算结果，并输出相加结果作为输出信号; 用于检测输出信号的误差的误差检测部分; 以及抽头系数更新部分，用于基于该误差来更新FIR滤波器和IIR滤波器的各抽头系数。 抽头系数更新部分将用于将FIR滤波器的抽头系数更新的步长设置为小于用于在从波形均衡器的操作开始到预定条件的期间内更新IIR滤波器的抽头系数的步长的值 满意

公开(公告)号：US20070041480A1

公开(公告)日：2007-02-22

申请号：US10553902

申请日：2004-04-21

申请人： Hiroshi Azakami ,  Misao Teshima ,  Shougo Sasaki ,  Yoshikazu Hayashi

发明人： Hiroshi Azakami ,  Misao Teshima ,  Shougo Sasaki ,  Yoshikazu Hayashi

IPC分类号： H04L27/08

CPC分类号： H03G3/3068

摘要： In a high-frequency signal level detection apparatus for detecting an inputted signal level of a high-frequency signal, an AGC circuit executes an AGC on an intermediate frequency (IF) signal obtained by converting a frequency of a received high-frequency signal, using an RFAGC value and an IFAGC value for controlling gains of the high-frequency signal and the IF signal, respectively, based on the IF signal so that an output level of the IF signal is substantially constant. A controller previously measures first and second relational data, indicating an RFAGC value and an IFAGC value relative to the inputted signal level of the received high-frequency signal, respectively, measures the RFAGC and IFAGC values when a high-frequency signal to be measured is received, and detects the inputted signal level of the received high-frequency signal using the measured first and second relational data based on the measured RFAGC and IFAGC values.

摘要翻译： 在用于检测高频信号的输入信号电平的高频信号电平检测装置中，AGC电路对通过转换接收的高频信号的频率而获得的中频（IF）信号执行AGC，使用 RFAGC值和IFAGC值，用于分别基于IF信号控制高频信号和IF信号的增益，使得IF信号的输出电平基本上恒定。 控制器先前测量相对于接收的高频信号的输入信号电平分别表示RFAGC值和IFAGC值的第一关系数据和第二关系数据，测量待测高频信号为RFAGC和IFAGC值时 基于测量的RFAGC和IFAGC值，使用测量的第一和第二关系数据来接收和检测接收的高频信号的输入信号电平。