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
Some new design algorithms of Variable Coefficient Difference Equation (VCDE) filters for the processing of cardiac action potentials (AP) are proposed.These algorithms directly control the filters’ cutoff freque...Some new design algorithms of Variable Coefficient Difference Equation (VCDE) filters for the processing of cardiac action potentials (AP) are proposed.These algorithms directly control the filters’ cutoff frequency using the absolute errors between input and output signals,which results in accurate preservation of the upstroke.Computer simulation shows that this convenient,direct approach performs excellently in AP processing.With reference to conventional design methods,the VCDE algorithm can also be applied to the design of highpass,bandpass and bandstop variable cutoff frequency filters,as well as filters with other special functions,which represents a breakthrough in nonlinear filters design.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.
文摘Some new design algorithms of Variable Coefficient Difference Equation (VCDE) filters for the processing of cardiac action potentials (AP) are proposed.These algorithms directly control the filters’ cutoff frequency using the absolute errors between input and output signals,which results in accurate preservation of the upstroke.Computer simulation shows that this convenient,direct approach performs excellently in AP processing.With reference to conventional design methods,the VCDE algorithm can also be applied to the design of highpass,bandpass and bandstop variable cutoff frequency filters,as well as filters with other special functions,which represents a breakthrough in nonlinear filters design.
