Hey, I'm implementing a flanger effect as part of a guitar effects processor on an ADSP-21364 development board. A Flanger effect is produced...

Hey, I'm implementing a flanger effect as part of a guitar effects processor on an ADSP-21364 development board. A Flanger effect is produced by adding a single delay to the current input sample, the length of the delay is dictated by a sin wave which i have in aa lookup table. This implements a comb filter. My problem is that on top of the desired output I am also getting a 'police si...

Hi, I'm an computer engineering undergrad with what is probably a simple filter question. I need to simulate in Matlab and provide a...

Hi, I'm an computer engineering undergrad with what is probably a simple filter question. I need to simulate in Matlab and provide a mathematical analysis of a bandpass filter by cascading a comb filter with a resonator. The comb has transfer function: Hc(z) = 1 + r^m*z^-m and the resonator: Hr(z) = z^2/(z^2 - 2*r*cos(omega)*z + r^2) = z^2/((z - r*exp(j*omega))(z - r*exp(-j...

hi everyone, when I use FDATools to design a CIC(cascade integrator comb)filter the input datatype must be signed fix point. but after our...

hi everyone, when I use FDATools to design a CIC(cascade integrator comb)filter the input datatype must be signed fix point. but after our sigma delta modulator, the output is in double type. how could I transfer between them in order to use CIC filter in Matlab simulink. forgive me my poor expressions and Thanks a lots zcambrdige

I have two audio signals that are correlated but one of them is a delayed version of the first signal (let say by 10ms). Now I want to sum...

I have two audio signals that are correlated but one of them is a delayed version of the first signal (let say by 10ms). Now I want to sum them together, but of course, this produces a nasty comb filter. So the first thing that sprung to mind was to allpass the "first" signal to approximate the 10ms delay of the second. This works good because I can tolerate some combing but at higher frequ...

Hi all. Does anyone know how to change the width of a feedback comb filter's teeth? From the general idea on wikipedia, it seems like it is only...

Hi all. Does anyone know how to change the width of a feedback comb filter's teeth? From the general idea on wikipedia, it seems like it is only possible to change the delays and the gain. Thanks

Hi all. Does anyone know how to change the width of a feedback comb filter's teeth? From the general idea on wikipedia, it seems like it is only...

Hi all. Does anyone know how to change the width of a feedback comb filter's teeth? From the general idea on wikipedia, it seems like it is only possible to change the delays and the gain. Thanks

Hi Rick, I was reading a chapter in the DSP tips and tricks book on using comb filtering after two-level saturated sampling for FSK...

Hi Rick, I was reading a chapter in the DSP tips and tricks book on using comb filtering after two-level saturated sampling for FSK demod preprocessing. The text said a comb filter equivalent could be made with a direct path and a delayed path input into an XOR gate because the inputs were binary. However, for the binary inputs, the outputs of an XOR are normally 2 level, while the output...

Hi all. I've found in MATLAB help that a notching comb filter has following tranfser function: H(z) = b*(1+z^(-N))/(1+a*z^(-N)) where N is...

Hi all. I've found in MATLAB help that a notching comb filter has following tranfser function: H(z) = b*(1+z^(-N))/(1+a*z^(-N)) where N is the number of notches. How to determine coefficients a and b with respect to real-world parameters such as sampling frequency, notch frequency and notch bandwidth/resp. attenuation? I don't have the filter toolbox and therefore not the 'iircomb' functio...

okay, we know about comb filters. https://ccrma.stanford.edu/~jos/pasp/Comb_Filters.html the simplest are feedforward comb...

okay, we know about comb filters. https://ccrma.stanford.edu/~jos/pasp/Comb_Filters.html the simplest are feedforward comb filters: y[n] = b_0*x[n] + b_M*x[n-M] H(z) = b_0 + b_M*z^-M then there are feedback comb filters: y[n] = b_0*x[n] - a_M*y[n-M] H(z) = b_0 / (1 + a_M*z^-M) now, isn't it still a "comb filter" when you combine the t...

Hi All 1) According to M.Donadio article "Cascaded Integrator-Comb Filter Introduction" Hf = (sin(pi*f*M)./sin(pi*f/R)).^N; where Hf =...

Hi All 1) According to M.Donadio article "Cascaded Integrator-Comb Filter Introduction" Hf = (sin(pi*f*M)./sin(pi*f/R)).^N; where Hf = amplitude response at frequency f M = number of comb delay stages N = number of cascaded comb/integrator pairs R = rate change(up or down) 2) According to Rick Lyon's article "Understanding cascaded Integrator-comb" Hf = (sin(pi*f*D)/sin(pi*f)).^M ...