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    • 1. 发明授权
    • Adaptive digital filter
    • 自适应数字滤波器
    • US07492817B2
    • 2009-02-17
    • US11056449
    • 2005-02-11
    • Ryohei TanakaToyokazu Kitano
    • Ryohei TanakaToyokazu Kitano
    • H03H7/30
    • H03H21/0012
    • An adaptive digital filter includes a filtering circuit and a coefficient renewal circuit. The filtering circuit has a coefficient a defined by a fundamental formula: a[n+1]=a[n]+β·e[n]·q[n]/p[n]. β is a number greater than 0 and smaller than 2, e[n] is a difference between the input and the output of the filter, and q[n] and p[n] are formulas. The renewal circuit calculates a renewal value of the coefficient a. The coefficient renewal circuit calculates 2m (m is an integer) greater than p[n] in the fundamental formula, and also calculates the renewal value of the coefficient a in accordance with an execution formula: a[n+1]=a[n]+β·e[n]·q[n]/2m in place of the fundamental formula.
    • 自适应数字滤波器包括滤波电路和系数更新电路。 滤波电路具有由基本公式a [n + 1] = a [n] + beta.e [n] .q [n] / p [n]定义的系数α。 β是大于0且小于2的数,e [n]是滤波器的输入和输出之间的差,q [n]和p [n]是公式。 更新电路计算系数a的更新值。 系数更新电路在基本公式中计算大于p [n]的2m(m是整数),并且还根据执行公式计算系数a的更新值:a [n + 1] = a [n ] + beta.e [n] .q [n] / 2m代替基本公式。
    • 3. 发明申请
    • Signal processing device for computing phase difference between alternating current signals
    • 信号处理装置,用于计算交流信号之间的相位差
    • US20060248138A1
    • 2006-11-02
    • US11406885
    • 2006-04-19
    • Ryohei TanakaToyokazu Kitano
    • Ryohei TanakaToyokazu Kitano
    • G06G7/00
    • G01R19/2506G01R25/00H03H21/0012
    • A signal processing device includes a converting unit, a filtering unit, a differential computing unit, and a phase difference computing unit. The converting unit samples two alternating signals with a predetermined period and converts the sampled level values into digital alternating signal data. The filtering unit filters the two digital alternating signal data generated by the converting unit so as to abstract digital alternating signal data having a predetermined frequency, and the filtering unit comprises an adaptive digital filter. The differential computing unit computes differentials of the digital alternating signal data generated by the filtering unit. The phase difference computing unit computes phase difference using the two digital alternating signal data generated by the filtering unit, and the two digital alternating signal data generated by the differential computing unit.
    • 信号处理装置包括转换单元,滤波单元,差分计算单元和相位差计算单元。 转换单元以预定周期对两个交替信号进行采样,并将采样的电平值转换为数字交替信号数据。 滤波单元对由转换单元产生的两个数字交替信号数据进行滤波,以抽出具有预定频率的数字交替信号数据,并且滤波单元包括自适应数字滤波器。 差分计算单元计算由滤波单元产生的数字交流信号数据的差分。 相位差计算单元使用由滤波单元生成的两个数字交替信号数据和由差分计算单元生成的两个数字交替信号数据来计算相位差。
    • 4. 发明授权
    • Signal processing device for computing phase difference between alternating current signals
    • 信号处理装置,用于计算交流信号之间的相位差
    • US07702702B2
    • 2010-04-20
    • US11406885
    • 2006-04-19
    • Ryohei TanakaToyokazu Kitano
    • Ryohei TanakaToyokazu Kitano
    • H03M1/00G06F1/02G06F17/10G01R25/00H03D13/00
    • G01R19/2506G01R25/00H03H21/0012
    • A signal processing device includes a converting unit, a filtering unit, a differential computing unit, and a phase difference computing unit. The converting unit samples two alternating signals with a predetermined period and converts the sampled level values into digital alternating signal data. The filtering unit filters the two digital alternating signal data generated by the converting unit so as to abstract digital alternating signal data having a predetermined frequency, and the filtering unit comprises an adaptive digital filter. The differential computing unit computes differentials of the digital alternating signal data generated by the filtering unit. The phase difference computing unit computes phase difference using the two digital alternating signal data generated by the filtering unit, and the two digital alternating signal data generated by the differential computing unit.
    • 信号处理装置包括转换单元,滤波单元,差分计算单元和相位差计算单元。 转换单元以预定周期对两个交替信号进行采样,并将采样的电平值转换为数字交替信号数据。 滤波单元对由转换单元产生的两个数字交替信号数据进行滤波,以抽出具有预定频率的数字交替信号数据,并且滤波单元包括自适应数字滤波器。 差分计算单元计算由滤波单元产生的数字交流信号数据的差分。 相位差计算单元使用由滤波单元生成的两个数字交替信号数据和由差分计算单元生成的两个数字交替信号数据来计算相位差。
    • 5. 发明申请
    • Adaptive digital filter
    • 自适应数字滤波器
    • US20050180497A1
    • 2005-08-18
    • US11056449
    • 2005-02-11
    • Ryohei TanakaToyokazu Kitano
    • Ryohei TanakaToyokazu Kitano
    • H03H17/04H03H21/00H03K5/159
    • H03H21/0012
    • An adaptive digital filter includes a filtering circuit and a coefficient renewal circuit. The filtering circuit has a coefficient a defined by a fundamental formula: a[n+1]=a[n]+β·e[n]·q[n]/p[n]. β is a number greater than 0 and smaller than 2, e[n] is a difference between the input and the output of the filter, and q[n] and p[n] are formulas. The renewal circuit calculates a renewal value of the coefficient a. The coefficient renewal circuit calculates 2m (m is an integer) greater than p[n] in the fundamental formula, and also calculates the renewal value of the coefficient a in accordance with an execution formula: a[n+1]=a[n]+β·e[n]·q[n]/2m in place of the fundamental formula.
    • 自适应数字滤波器包括滤波电路和系数更新电路。 滤波电路具有由基本公式a [n + 1] = a [n] + beta.e [n] .q [n] / p [n]定义的系数α。 β是大于0且小于2的数,e [n]是滤波器的输入和输出之间的差,q [n]和p [n]是公式。 更新电路计算系数a的更新值。 系数更新电路计算基本公式中大于p [n]的2(m是整数),并且还根据执行公式计算系数a的更新值:a [ n + 1] = a [n] + beta.e [n] .q [n] / 2 代替基本公式。
    • 7. 发明授权
    • Signal detection apparatus
    • 信号检测装置
    • US08654831B2
    • 2014-02-18
    • US13237182
    • 2011-09-20
    • Toyokazu Kitano
    • Toyokazu Kitano
    • H03H7/30H03H7/40H03K5/159
    • G01R25/005
    • A signal detection apparatus detects the frequency of an input signal without using a PLL. The detection apparatus includes a first and a second orthogonalizer, a phase difference calculator and an integrator, to control the variable coefficient a1 of a band-pass filter. Information e[k]=M·sin(φ) representing the phase difference φ between the input data x[k] and the output data y[k] is calculated with the first and second orthogonalizers and the phase difference calculator. The sign of e[k] is inverted and a predetermined integral calculation is performed with the integrator, and the calculated integral value is set as the coefficient a1 of the band-pass filter. Every time input data x[k] is input, the coefficient a1 is changed by reducing it when e[k]>0 and increasing it when e[k]
    • 信号检测装置在不使用PLL的情况下检测输入信号的频率。 检测装置包括第一和第二正交器,相位差计算器和积分器,以控制带通滤波器的可变系数a1。 使用第一和第二正交分析器和相位差计算器计算表示输入数据x [k]和输出数据y [k]之间的相位差phi的信息e [k] = M·sin(phi)。 e [k]的符号被反相,并且利用积分器执行预定的积分计算,并将计算的积分值设置为带通滤波器的系数a1。 每当输入数据x [k]输入时,当e [k]> 0时,系数a1通过减小而改变,并且当e [k] <0时增加系数a1。 因此,带通滤波器的输出信号的频率与输入信号相匹配。