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
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
The filter proposed in this paper is expected to reduce noise whose frequency is lower than higher order harmonics of real signals.It is based on the distributive characteristics of noise,and uses analog circuits to s...The filter proposed in this paper is expected to reduce noise whose frequency is lower than higher order harmonics of real signals.It is based on the distributive characteristics of noise,and uses analog circuits to select the high peak and low peak of the input signal and applies their average in order to reduce random noise.So it has no cutoff frequency and higher order harmonics of real signals are remained.As a result,it gives an instant response to changes in input signals and retains the integrity of real signals.Furthermore,it has only a small phase delay.The simulation results of slew rate,phase delay and spectral analysis under MULTISIM indicate that the quick response noise filter achieves a high slew rate of 472 V/ms and the phase shift is nearly zero.By having it used in a color tester design,it is also demonstrated that the proposed filter effectively reduces noise and remains signal integrity.With the filter 's help,the relative standard deviation of the spectrograph decreases from 1% to 0.22%,indicating better stability.展开更多
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.
基金Sponsored by the National High Technology Research and Development Program(Grant No.863-2-5-1-13B)
文摘The filter proposed in this paper is expected to reduce noise whose frequency is lower than higher order harmonics of real signals.It is based on the distributive characteristics of noise,and uses analog circuits to select the high peak and low peak of the input signal and applies their average in order to reduce random noise.So it has no cutoff frequency and higher order harmonics of real signals are remained.As a result,it gives an instant response to changes in input signals and retains the integrity of real signals.Furthermore,it has only a small phase delay.The simulation results of slew rate,phase delay and spectral analysis under MULTISIM indicate that the quick response noise filter achieves a high slew rate of 472 V/ms and the phase shift is nearly zero.By having it used in a color tester design,it is also demonstrated that the proposed filter effectively reduces noise and remains signal integrity.With the filter 's help,the relative standard deviation of the spectrograph decreases from 1% to 0.22%,indicating better stability.
