公开(公告)号：EP0284175A2

公开(公告)日：1988-09-28

申请号：EP88300324.6

申请日：1988-01-15

申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

发明人： Ishikawa, Seiichi ,  Matsumoto, Masaharu ,  Satoh, Katsuaki ,  Kawamura, Akihisa

IPC分类号： H03H17/02 ,  H03H17/06

CPC分类号： H03H17/06 ,  H03H17/0211

摘要： An apparatus for calculating a filter factor for a digital filter which can be made with a simple construction and in which the time period for calculation can be shortened as compared with conventional techniques. The apparatus comprises an inputting circuit (1) for inputting a desirable frequency property, a division circuit (2) for dividing the inputted frequency property into a plurality of frequency bands, and a calculating circuit for obtaining filter factors for realizing a frequency property of each of the divided frequency bands. The inputting circuit inputs the frequency property with a frequency resolution corresponding to the number of the filter factors. The division circuit performs a correction for a division so that the frequency property becomes zero from a frequency over the high cut-off frequency of a band-pass filter toward the Nyquist frequency of the frequency band corresponding to the transversal filter, the Nyquist frequency being 1/2 of the sampling frequency. The calculating circuit has a transformation unit (3) for performing a Hilbert transformation or a linear phase transformation with respect to the respective frequency properties divided by said division means.

摘要翻译： 一种用于计算用于简单结构的数字滤波器的滤波器系数的装置，并且与现有技术相比可以缩短计算时间段。 该装置包括用于输入期望的频率特性的输入电路（1），用于将输入的频率特性分成多个频带的分频电路（2），以及用于获得用于实现每个频带特性的滤波因子的计算电路 的分频。 输入电路以频率分辨率输入频率特性，频率分辨率与滤波因子的数量相对应。 分频电路进行除法校正，使频率特性从带通滤波器的高截止频率的频率向与横向滤波器对应的频带的奈奎斯特频率成为零，奈奎斯特频率为 采样频率的1/2。 计算电路具有变换单元（3），用于相对于由所述分割装置划分的相应频率特性执行希尔伯特变换或线性相位变换。