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# Iir Filter

235 Threads found on edaboard.com: Iir Filter

## simulating a IIR filter butterworth method in matlab

Hello! Can someone point me to some detailed matlab tutorials that can help me with my assignment? Or a few explanations would be much appreciated. iir filter Butterworth method Fpas s=9kHz, Fstop=11kHz, Apass=1dB, Astop=25dB and Fs=40kHz iir filter analog prototype H(s)= 0.0979/(1*s^5+2.0333*s^4+2.0671*s^3+1.2988*s^2+0.

## VHDL 1 D Kalman Filter

The given filter is a simple first order digital iir low-pass. For certain problems, it might be a useful Kalman filter. (Kalman filter isn't a specific filter type rather than a filter goal specification). Digital filters are mostly implemented using fixed point instead (...)

## UWB antenna as filter

Hi, I am interested about planar UWB antennas like vivaldi or patch antenna. These UWB antenna should be considered as what type of filter (eg FIR or iir) ? After simulating in HFSS, if I save |S11 | dB 2D plot in .csv format, how may I get frequency response H(jomega) from S11.csv file in MATLAB?

## fir filter difference in 8-bit and 12-bit modes

Rounding and precision issues can be very significant in digital signal processing. For example I inherited an iir filter in a control application and eventually realized how poorly configured it was for the task. Small signals (and as an error amplifier that's all it should see) multiplied by small coefficients rounded to zero, essentially negat

## Desgining butterworth filter of Nth order

Butterworth is an iir filter, the PT1 response to a step should be an exponential function. In case you are intending an FIR butterworth approximation you should mention this.

## 90 Degrees Shift of Digital Signal

Not really my area, but a hilbert transform on a periodically sampled signal should help getting a 90 degree component. But if I was going after real and reactive power, I would: Real power- Multiply samples of V and I taken as close as possible to the same sample time, then put the result through an iir low pass filter. Reactive Power- Find the

## Noise cancellation using IIR LMS and Unscented Kalman for speech enhancement

Hiho, I am doing research using matlab- R(2011a) for noise cancellation using iir LMS and unscented kalman filter. But I don't know how to create the code using matlab for iir LMS. And for UKF, i dont know what is the equation of non linear state equation representing speech. Please could some experts can help me to solve my problems. (...)

Hi everyone! I wanted to design some digital filters for an ECG device based on Zynq SoC. Since The device works with 24bits of data, I can't use the FIR block present in System generator. So I designed a low-pass 65th order FIR filter with 250Hz cutoff frequency, and a 2nd order band-stop iir filter with 50Hz center (...)

## Audio detector that ignores 50Hz mains hum using arduino/attiny

I guess you could do that by an iir bandpass filter, taking the average amplitude, and then passing this signal through a kind of integrator which would act as an rectifier.

## Practical Application of FIR

FIR filters: They do not have poles (actually all poles lies on the center of the unit circle in z transform). FIR filters only have zeros. Order of FIR filter decide the number of zeros. FIR filter is always stable because they do not have poles. There is no feedback in FIR filter. iir (...)

but the filter characteristics are not producing due to high sampling frequenciesI don't understand what you exactly mean with this statement. An iir filter with nomalized passband corner frequencies can be made. You get of course a high dynamic range for the filter cofficients, resulting in respectively high

## designing a filter bank

i read in a ieee paper that FFT are use to design a filter bank instead of FIR and iir filters but i am not understanding how it happens they said that FFT is used to increase the channels if necessary with same FFT can u please help me in this topic

## Digital iir filter stability checking.

Hi all, I am trying to confirm the stability of some digital iir filters I am using. I have downloaded a trial of Matlab 2014b and have been attempting to use the isstable function to check stability, this tells me that my high frequency notch and bandpass filters are stable but my mains (50Hz) noise notch filter and (...)

## urgent need for source code of iir filter design using genetic algorithm

hi friends i am just started my project on iir filter design using genetic algorithm plz help me write source code plz plz thanks in advance

## what does the order of a Filter (FIR or IIR) signifies

I guess that you implies the delay count? If so, you should examine the polynomial order of the FIR/iir filter. For example, a filter usually can be expressed as the following form: H(z) = A0 + A1 * z-1 + A2 * z-2 + ... + An * z-n where Y(z) = X(z)H(z).

## testing a iir filter in matlab

hi i am doing a project on filter design i am stuck while testing the filter. i want to know how to test a filer in matlab coding my code is clc; clear all; in=; wp=420; ws=490; rp=3; rs=80; fs=1000; w1=2*wp/fs;w2=2*ws/fs; =cheb1ord(w1,w2,rp,rs) = cheby1(n,rp,wn) =freqz(

## Low Pass Filter Using FIR compiler

Sampling frequency should be as low as possible to allow handy filter order, but must at least fulfill the Nyquist criterion for the input signal. You can play around with the matlab filter tool to get a feeling of meaningful filter parameters. I find iir filters more effective for my range of applications.

## FIR filter in Matlab for bandpass 250kHz - 700kHz and sampling frequency 250MSPS

You give the explanation in the question title. The minimal FIR filter order is related to the fs/fc ratio. With this sampling frequency, you can't make even a poor FIR filter with less than e.g. 500 or 1000 taps. Possible solutions: - design a multirate filter with decimation before the final filter - design an (...)

## emphasis/de-emphasis filter design 6 db/octave

I am looking for implementation for emphasis filter +6db/octave and -6db/octave in dsp processor. I remember that some years ago I saw it in source codes from TI. As I remember it was simple low order iir filter. But now I can't find that source code. Thanks in advance.

## Signed Multiplication VHDL, or real

You are apparently implementing a first order iir low-pass filter. For a low pass with unity gain, coefficients b and c sum to 1. I don't see how a meaningful low-pass implementation would have very small c values, resulting in b near to 1, or in other words about no filter effect. In contrast, a filter with large fc/fs (...)

## Digital Leaky Integrator (First order IIR digital LPF)

For systematical clarity, we should name the design what it is, a first order digital low pass filter. "digital leaky integrator" is more a visual description of it's operation. I recognize that it's from a VHDL lecture for physicists. With suffcient high fs/fc ratio, the time discrete behaviour of the digital filter is effectively identical wit

## How to decide or select a filter type of an IIR filter

Hello, can someone explain what should be taken into account to select a particular type to use for the iir lowpass filter design. I am confused in the selection of the type to use to design the iir filter for lowpass implementation if needed fc=4Hz and sampling freq=100Hz for the data attached below. Thanks.102788

## How to build the filter function of an IIR filter if coefficients are available

Hello, I want to know how to build an iir filter function if the filter coefficients got form matlab are available. The lowpass iir filter designed in matlab is shown below with fc=4Hz,sample frequency=100Hz = cheby1(2,0.5,4/50,'low'); filter_output=filtfilt(b,a,signal); I used (...)

## Need help with the IIR fitler design to filter pulse signals

Hello, I already used an FIR lowpass fitler as shown below with a fc=4Hz and sampling freq=100Hz for the data attached Hf = fdesign.lowpass('N,Fc',31,4,100); Hd =design (Hf); Coeff= Hd.Numerator; data3= filtfilt(Hd.Numerator,1,a); But, I now I want to design the iir fitler for the same to check the difference between the [I

## Differences between the implemenation of IIR and FIR fitlers on microcontroller

Hello, Can someone explain the difference between the implementation of iir and FIR filter with microcontroller if I am planning to implement a lowpass filter Thanks.

## How to use IIR filter coefficients(FDA tool) to filter the signal

Hello, I generated the iir filter using the Matlab FDA tool.The filter parameters are Butterowrth,Lowpass,Order:10,fs=100Hz,fc=4Hz. I exported the fitler coeffcients to workspace but how to use these filter coefficients to filter a signal. The coefficients are as shown here . 102650 Thanks.

## Suggestions to select a filter method to use it for micrcontroller implementation

You can test FIR versus iir implementation in Matlab. To get the same behaviour as in the microcontroller, you'll use a fixed-point simulation. You'll find out that for the given fs and fc values, a FIR implementation doesn't produce a reasonable frequency response below 100, better 200 taps, which gives a strong bias towards iir, I think.

Hi.I am implementing a Low power iir filter in verilog,I have to discard the extra bits that comes at the output due to feedback.when the extra bits are discarded filter characteristics will some how get changed?give me any suggestion about specifications so that my filter response is stable and not very much affected

## Why is FIR filter easy to implement?

They are easy to implement because they require only 3 elements: storage memory for accumulator value, and multiplicate and sum units. iir filters also req the same units but they stability is uncertain and accumulator length is much more complicated to calculate so that it will not overflow. Not mantioned that in real hardware loopback is hard to

## Determining filter archtecture from the frequency response

Is there an easy or straightforward way to analyze a frequency response plot/filter profile of a digital filter and determine it's architecture (number of taps, FIR vs iir, decimation rate, coefficients, etc) For example, what information do i have about the filter and it's implementation by looking these plots (these are (...)

## how to create iir filter in vhdl

hi evryone i m woking with fpga spartan 3 kit and i need to implement an iir filter with equation y(n)=∑_(k=0)^N+∑_(k=0)^M but i have problem in creating of this equation in vhdl can you help me?

## direct form and cascade form

how the direct form is most sensitivity to the coefficient quantization in iir filter. and cascade form is not much sensitive to the coefficient quantization in iir filter. how the direct form is more efficient in FIR filters.

## Design a low pass IIR filter to meet the following specification.provide design stage

Design a low pass iir filter to meet the following specification Sampling frequency 15KHZ pass band frequency 0-3KHz transition width 450Hz pass band ripple 0.5dB stop band attenuation 45dB Obtain the filter frequency response any body please (...)

## Design a low pass IIR filter to meet the following specification.provide design stage

Design a low pass iir filter to meet the following specification Sampling frequency 15KHZ pass band frequency 0-3KHz transition width 450Hz pass band ripple 0.5dB stop band attenuation 45dB Obtain the filter frequency response any body please help me i am stuck in this question, its for my final year Coursework

## Design of IIR Biquad Filters - Calculation of Filter Coefficents

Hello Audio Experts and aspirants, First of all i will try to put my agenda of my system: >capture of ubiquitous speech of a area under surveillance and further transfer it to a RF module that's it In that event i have chosen to use a stereo codec chip from TI - AIC3204 which has inbuilt programmable iir Bi-quad filter having a transfer

## Having Trouble With Designing IIR Filter on Frequency Transformation

Hello all, As written in title, I am having trouble with frequency transformation. There are three problems I am encountering right now. (1) Over-specification band pass filter I designed a 4th order chebyshev low pass filter which does satisfy given specification, in which - pass band edge frequency fp = 6500 Hz, - stop band edge freq

## adaptive IIR filter with TI C64xx family

Keep in mind that iir/FIR. specify the underlying filter structure, while adaptive refers to how the coefficients are updated. You probably are looking for an adaptive FIR filter that uses the LMS algorithm.

## Digital FIlter design need help

when i go for iir filter minimum order required is 14 but coefficient are so small(in term of 10 power -17) that i cant implement in FPGA. The statement is meaningles without telling the filter specification. Most likely, the problem is an unrealistic specification. which type of filter i should use which work well for ve

## help with IIR filter(low-pass filter with impulse invariance and ellipsoid )

here is the problem: i use impulse invariance transform to design low-pass filter, butterworth,chebyshev1 can perfectly achieve the requirements,but ellipsoid and chebyshev 2 can't achieve the Rs(Stopband attenuation) and here is my code and figure： Fs=400 fp=100;fs=120; Ap=1;As=20 Wp=2*fp*pi;Ws=2*fs*pi; =ellipord(Wp,Ws,Ap,As,

## IIR not working on system genrator

Im trying to implement 2nd order iir filter ( direct form 1) by xilinx block set in system generator but on output im getting noise. same filter i implemented in matlab simulink (without using xilinx block) it is working fine. I checked till feed forward path the output of matlab simulink and system generator both are same. i think that (...)

## Optimal FIR filter into Analog (IIR) filter for SDM

Hi all, for my sigma delta modulator I have a mathematically optimized filter impulse response (of finite length), which I need to implement as an analog filter from system point of view it could be directly implemented as an FIR filter, but since the number of taps is relatively large (~100) that does not make a lot of sense. do you (...)

## implementation of filter design

Hi all!! We use a delay unit in the feed back path to implement z-1 in FIR/iir system design. I am curious to know how to implement 'z' and positive powers of z if they appear in the tranfer function. Sorry if the question seems a bit stupid :-( Thanks

## Half Band IIR Filter Design using MATLAB

Hi, I am referring to the paper "Half Band iir filter Design using MATLAB" by Lutovac and Mili, to design an iir HB filter, but I am not getting the results as expected. An example in the paper: Fp = .22; Fs = 0.5 - Fp; Rp = 0.01; As = 46; if(-10*log10(1-(10^(-Rp/10)))>As) HBAs = -10*log10(1-(10^(-Rp/10))); (...)

## samples required by digital filters related to thier order

The order of a FIR filter is the degree of its transfer function polynomial, i.e., the number of zeros. An N-order FIR filter uses N+1 input samples (the last one and the N previous). The order of a iir filter is the degree of the denominator polynomial, i.e., the number of poles, provided it has no more zeros than poles. (...)

## vhdl code for iir filter

hi evryone i m woking wth fpga spartan 3 kit i need to implement a 3rd order high pass iir filter on fpga,i have made a system generator model in matlab it is working properly so far simulations are concrned but in real time implementation it is not giving any filter response now i want to switch from system generator to vhdl i know nothing (...)

## implemtntation of iir filters in system generator based fpga

i m doing a project on implementation of iir filters using system generator based fpga. i m using spartan 3 starter kit for this purpose however i m facing problem as it is not providing me with any iir filter response while on the same fpga fir filters are working properly, can sombody help me in detecting (...)

## help: IIR Filter design

I want to write a second order low pass iir filter. Could you please suggest me good tutorials and examples? Another Q: Could i reach 300 MHz iir with FPGA ?

## 10 band EQ on blackfin ADSP

Hi! I'm beginner in DSP area and I want to implement 10 band equalizer with additional Q - control (width of the band) and maybe even center frequency point control (extension to parametric EQ), if it doesn't complicate things too much. Boost should be in +/- 12 to 18dB range. EQ will be run on ADSP-BF548 (Blackfin). Here are some questions for

## little Fpass highpass filter

If i use fir filter, order of HPF(remove DC) is very large. Yes, use simple first order iir.