This paper introduces the design and implementation of 1 D variable cutoff frequency (VCF) digital filters. A lowpass to highpass transformation and a lowpass to bandpass transformation for VCF infinite impulse r...This paper introduces the design and implementation of 1 D variable cutoff frequency (VCF) digital filters. A lowpass to highpass transformation and a lowpass to bandpass transformation for VCF infinite impulse response (IIR) filter are presented. The transformed highpass and bandpass filters are implemented in a network structure in which the cutoff frequencies are variable by adjusting single parameter.展开更多
A kind of novel nonlinear digital filter,2 D variable coutoff boundary (VCB) IIR low pass filter, is presented in this paper. Based on 1 D variable IIR low pass filter, two types of 2 D VCB IIR low pass filter a...A kind of novel nonlinear digital filter,2 D variable coutoff boundary (VCB) IIR low pass filter, is presented in this paper. Based on 1 D variable IIR low pass filter, two types of 2 D VCB IIR low pass filter are designed via spectral transformation. One is a separable 2 D VCB IIR low pass filter; the other is designed via all pass transformation. The cutoff boundary of such a kind of filter can be changed automatically according to the characteristics of input signals by adjusting the location of poles through error signals obtained lately.展开更多
文摘This paper introduces the design and implementation of 1 D variable cutoff frequency (VCF) digital filters. A lowpass to highpass transformation and a lowpass to bandpass transformation for VCF infinite impulse response (IIR) filter are presented. The transformed highpass and bandpass filters are implemented in a network structure in which the cutoff frequencies are variable by adjusting single parameter.
文摘A kind of novel nonlinear digital filter,2 D variable coutoff boundary (VCB) IIR low pass filter, is presented in this paper. Based on 1 D variable IIR low pass filter, two types of 2 D VCB IIR low pass filter are designed via spectral transformation. One is a separable 2 D VCB IIR low pass filter; the other is designed via all pass transformation. The cutoff boundary of such a kind of filter can be changed automatically according to the characteristics of input signals by adjusting the location of poles through error signals obtained lately.
