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    • 11. 发明专利
    • Sampling frequency converter
    • 采样频率转换器
    • JPS5765918A
    • 1982-04-21
    • JP14275080
    • 1980-10-13
    • Victor Co Of Japan Ltd
    • KASUGA MASAO
    • H03H17/00H03H17/02H03H17/04H03H17/06
    • H03H17/0288H03H17/0416
    • PURPOSE:To make a filter small-scale, by cascading a finite impulse response digital filter and an infinite impulse response digital filter between an interpolator and a thinner. CONSTITUTION:The signal sampled by a sampling frequency f1 is inputted to an interpolator 2, and a zero point is inserted to this signal. A low-pass filter 3 is provided to take out a signal of a frequency f1/2 or below of required components from the frequency spectrum of the signal obtained as the result. In the low-pass filter 3, a finite impulse response digital filter which is a noncyclic digital filter and has the end of the pass band lower than the half of f1 and the end of the attenuation band slightly higher than the half of f1 and an infinite impulse response digital filter which is a cyclic filter and has the end of the pass band slightly lower than the half of f1 and the end of the attenuation band slightly lower then the half of f1 are cascaded. The output of the low-pass filter 3 is thinned by a sampling frequency f2.
    • 目的:通过级联有限冲击响应数字滤波器和内插器与较薄的无限脉冲响应数字滤波器,实现小尺寸滤波。 构成:由采样频率f1采样的信号被输入到内插器2,零点被插入到该信号中。 提供低通滤波器3,从作为结果获得的信号的频谱中取出所需分量的频率f1 / 2或更低的信号。 在低通滤波器3中,作为非循环数字滤波器的有限脉冲响应数字滤波器,其通带的结束低于f1的一半,衰减频带的末端略高于f1的一半, 无限脉冲响应数字滤波器,其是循环滤波器,并且通带的结束略低于f1的一半,并且衰落频带的末端略低于f1的一半。 低通滤波器3的输出被采样频率f2减薄。
    • 17. 发明公开
    • Multichannel decimation/interpolation filter
    • Mehrkanaliges dezimierendes / interpolierendes过滤器。
    • EP0275136A2
    • 1988-07-20
    • EP88300015.0
    • 1988-01-05
    • Hewlett-Packard Company
    • Morton, Douglas W.
    • H03H17/04
    • H03H17/0416H03H2218/06
    • A multichannel, digital filter capable of operation in either decimation or interpolation mode. In a preferred arrangement, the filter includes means for receiving and storing data representing the number of channels M, the number of passes N for each channel, and mode data re­presenting decimation or interpolation mode. The multichannel filter receives a sequence of digital input values comprising time multiplexed samples from M input channels [1-8], and filters the input values from each channel to produce filtered output data for each channel. The filter includes N serially connected digital low pass filters for each channel. Low pass filter n + 1 is executed only half as often as low pass filter n, thereby providing a decimation or interpolation function, depending on the mode data. Novel means are described for sequencing the low pass filters and for storing the state variables of such filters. Means are also provided in decimation mode for outputting either a single pass N or all passes greater than or equal to N.
    • 能够以抽取或插值模式进行操作的多通道数字滤波器。 在优选的布置中,滤波器包括用于接收和存储表示通道数M,每个通道的通过次数N以及表示抽取或插值模式的模式数据的数据的装置。 多通道滤波器接收包括来自M个输入通道[1-8]的时分复用采样的数字输入值序列,并对来自每个通道的输入值进行滤波,以产生每个通道的滤波输出数据。 该滤波器包括用于每个通道的N个串行连接的数字低通滤波器。 低通滤波器n + 1仅执行低通滤波器n的一半,从而根据模式数据提供抽取或插值功能。 描述了对低通滤波器进行排序和存储这种滤波器的状态变量的新颖手段。 还提供了用于输出单程N或大于或等于N的全部通过的抽取模式的装置。
    • 19. 发明申请
    • COMB FILTER
    • 梳状滤波器
    • WO99016169A1
    • 1999-04-01
    • PCT/DE1998/002453
    • 1998-08-21
    • H03H17/00H03H17/02H03H17/04
    • H03H17/045H03H17/0251H03H17/0416
    • The invention relates to a comb filter consisting of integrators (I1, I2, I3) connected in series, to which a digital data flow with high scanning rate is fed in order to supply a digital data flow with a lower scanning rate. The most significant bits of the digital data flow are reset in the first and second integrators (I1, I2), whereby the resetting of the bits in the first integrator (I1) is stored in a counter (Z). The count of the counter (Z) is fed to the most significant bits of the last integrator (I3) during reset time.
    • 本发明涉及串联连接的积分器,梳状滤波器(I1,I2,I3),被供给以高采样率的数字数据流,以提供一个数字数据流的低采样率的。 数字数据流的最显著位是在第一和第二积分器(I1,I2)被复位,在第一积分器(I1)中的比特的复位被存储在计数器(Z)。 计数器(Z)的计数被送到复位时间的最后积分器(I3)的最显著位。