Design of Two-Dimensional Periodically Time-Variant Digital Filters (Special Section on Digital Signal Processing)
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概要
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This paper discusses a design method for two-dimensional (2-D) periodically time-variant digital filters (PTV DFs) whose filter coefficients vary periodically. First, 2-D periodicities for a variation of filter coefficients are considered, from which two and four-phase variations of coefficients are shown to be suitable for practical applications. Then, the input-output relation (transfer function) for 2-D separable-denominator (SD) PTV DFs is derived, which results in a linear combination of the baseband input signal and its modulated versions. Finally, in order to approximate given filter specifications, the structure for 2-D SD PTV DFs is given and a design method is proposed. It is shown that, compared with the 2-D SD time-invariant DFs, approximation error can be reduced with the proposed SD PTV DFs.
- 社団法人電子情報通信学会の論文
- 1997-08-25
著者
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Sakai Yoshinori
Faculty Of Engineering Tokyo Institute Of Technology
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Yoshida Toshiyuki
Faculty Of Eng. Tokyo Institute Of Technology
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Sakai Yoshinori
Faculty Of Eng. Tokyo Institute Of Technology
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