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EJ: Remez / PM for nonlinear phase

Eric, I just now focused on your suggested process: "generate the usual Remez input grid, except now create real and imaginary components. Send the real portion into the Remez routine configured for normal filter design, and send the imaginary component into the Remez routine with the Hil...

Remez algorithm and filter lengths

Hi all. I was just involved in a thread over at comp.soft-sys.matlab where I got involved with the Remez algorithm. The matlab SP toolbox version is the only implementation of the Remez algorithm I have used, and it requires the user to specify the length of the FIR filter to be designed...

Help with Remez function in Scilab...

Hello all...I'm new to the group and relatively new to Scilab. I'm trying to convert a section of code from Matlab to Scilab (please don't ask "why?" as I'm still trying to figure that one out myself...suffice it to say it is "because I have to"), and I'm completely stuck on converting the following...

Specific Remez algorithm source

Hi Everybody I'm looking for the 'C' source of a Remez algorithm which is altered to design arbitrarily long filters with arbitrarily many linear bands. In fact, the MatLab function 'remez' do this but I need a 'C' source because I work under Labwindows CVI and the equivalent function in La...

REMEZ computational complexity

Can any body tell me the complexity means number of operations required by the 1. remezord algorithm to estimate the order of filter. 2. remez algorithm to calculate an N order filter's impulse response (coefficients). Thnaks in advance for the information. ...

Remez Exchange code for TMS320C50 ?

Hello fellas ... I am making this short & sweet ... Can anyone give me a download link or mail me (if they have ) the assembly code for the Remez Exchange Algo for the TMS320C50 model. I am implementing digital filters and its necessary. I found the c program on Jake's site but how do i convert...

Differentiators using Remez/Parks McClellan

Dear comp.dsp, I have written a simple Parks McClellan implementation myself, and wish to extend it for differentiators. Later, I came across Jake Janovetz's code here http://www.janovetz.com/jake/ and tried it out to find out how to get differentiators. I am able to get ordinary high/ low/ba...

Remez Exchange Algorithm

Hi, I want to optimize a 32 band EQ plugin. Currently it uses inverse FFT for the creation of the FIR filter kernel. But this requires rather long FIR kernels to process low frequencies properly. While computing power is nowadays not an issue the latency is. I heard about the "Remez Exch...

Re: Filter design with a desired group delay?

In article 7c4bf533.0401070850.53b25746@posting.google.com, ZedToe at acoustictech_zhangtao@yahoo.com.sg wrote on 01/07/2004 11:50: > Hi, > > The fdatool in matlab usually designs a real equiripple filter with a > group delay (N-1)/2 or N/2, where N is filter length. dunno about the f...

C code for Remez Exchange / Parks-McClellan Algorithm

Hi, I need to write some C code that is able to generate its own filters via Remez Exchange / Parks-McClellan Algorithm. I checked Numerical Recipes and didn't see anything. Does anyone know of a place where I can find some C source code for this algorithm? Thanks! John ...

Re: Arbitrary frequence response

Hi, You could use Remez design (the function is called firpm in matlab) or you could use least square based design (the function name is matlab is called "firls"). I had used firls over remez for performing inverse sinc filtering. and it gave me better results. this was in year 2001. hence ...

How to use Jake's Remez Exchange code to design a differenciator?

Guys, I have a little problem to use his code to design a differentiator. To use the Remez in Matlab, we specify the gain expected at the band edge. But in Jake's code, only one desired value is allowed in each band. What I should give for differentiator? I tied to give the slope. But id gave...

The Parks-McClellan algorithm

Hi All. To make a short story long, my little FIR filter project is happily trodding along. I am starting to get the various window functions in place for LP prototypes, and with some luck, it's not a big deal to generate HP or BP versions from the LP prototypes. Band-stop filters are a ...

Re: numerical differentiation of oscillating singal

Use B=REMEZ(N,F,A,'differentiator') and B=REMEZ(N,F,A,W,'differentiator') For bandlimited differentiation. The problem with differentiation is the noise at high frequencies. HTH -- ----------------------------------------------------------- Dr. Izhak "Rex_chaos" wrote in messag...

Re: Linear Phase via 'Phase Cloning' New Method

> I have got the same magnitude response and linear phase using the > following approach > > Remez + hanning window. > In (Remez+Hanning) total tap length = 25 (symmetric coeffs) > > In phase cloning approach total tap length = 35 (non-symmetric coeffs). > > Hence Remez + hanning w...

minimax and choosing weights

Good evening (here it is, at least)! I'm having a little trouble with the design of a linear phase FIR. I'm using remez (minimax/equiripple) in matlab. My specification is; +-A dB in the passband and -B dB in the stopband, band edges at \omega_{p} and \omega_{s}. Now I need to choose my weighting so...

Re: Window of understanding opened ONCE WAS [Re: Imp.inv/bilinear trans. vs. expm()]

Richard Owlett wrote in message news: ... > I've asked questions about "arbitrarily shaped frequency response > filters". I kept getting answers assuming "arbitrary" referred to > amount of ripple in passband/stopband. What I *MEANT* was an > *ARBITRARY* form of response vs frequenc...

FIR filter design (false advertizing?)

Trying to design an FIR Low pass filter. As a simple example, consider: > > edge = [0 .3 .7 1]; > > weight = [100 1]; > > 1000*remez(7,edge,[1 1 0 0],weight) ans= 32.2690 -109.2208 81.9170 495.0689 495.0689 81.9170 -109.2208 32.2690 The resulting filter has a pass band ripple of +/- .01...

Re: Need Ideas!!

"Neelabh" wrote in message news:tNOdnf5vs8thhRXanZ2dnUVZ_ryqnZ2d@giganews.com... > I'd be deeply grateful if someone could help me out. I'm looking for ideas > for an academic project on telecommunications DSP. Everything I've looked > at so far has been done several times over. Could s...

Converting IIR to FIR was Re: filtering in freq domain

Rune Allnor wrote: > Mark Borgerding wrote in message news: ... > > If you read the exchange of opinion between Randy and me, you will find > that one opinion goes as "Non-FIR filters filters can not be implemented > in frequency domain" while the other goes as "yes they can, and he...

Re: Why Wiener?

On 30 Mar, 14:22, "julius" wrote: > On Mar 30, 6:40 am, "Rune Allnor" wrote: > > > Cultural differences is a major issue here. Remember, once Wiener's > > WW II papers were de-classified, the cold war was on. Getting > > access to Russian papers was not at all easy for people in t...

Re: Simply FIR question

in matlab it is also possible to design FIR filters, especially with fdatool if you have the toolbox, or using the fir1() or remez() commands, depending on the filter you want to deign. This is helpful in the case you don't want to copy your 1024 coeffs into a matlab function to plot them .....

Re: FIR and IIR

The best place to search for help with Matlab is Matlab itself! Use the 'help' command within the Matlab command window. This will tell you which toolboxes you have available, you can then type 'help nameoftoolbox' for a listing of commands available within that toolbox, you can then get help...

REMEZ FIR filter generation (FIR Design Algorithms)

Hello, i am looking for an algorithme in C in order to generate Parks-McClellan FIR filter. I found one at "http://www.menne-biomed.de/". I want to know if someone has already use this type of algorithme ? Is there another available ? Is generated FIR coeficients are good ? thanks for yo...

Re: matlab firpm

in article 1118766437.563081.50000@g47g2000cwa.googlegroups.com, homerbebe@yahoo.com at homerbebe@yahoo.com wrote on 06/14/2005 12:27: > b = firpm(N, Fo, Ao, W, {dens}); did they change the name of remez() to firpm()? good for MathWorks! now if only they'll allow us array indices that ar...

Re: Demod Woes

Hi Paul, You probably already know this but I'll just mention that if you have sufficient computational horsepower available, you can use Parks-McClellan (Remez) filter design software to design a high-performance wideband FIR (tapped-delay line) differentiator. If you do this, d...

Re: FM Demodulation Woes

Clay S. Turner wrote: > "Paul Solomon" wrote in message > news:43596fac$1@dnews.tpgi.com.au... > > Hi Clay, > > > > This has been brought up a few times and the thing that has stopped me > > going down this road each time is that with all mt googleing, I have still > > not been a...

filter design

Hi, Suppose I want to design a digital filter for some application. There are some options to do this: - weighted least squares design - minimax design - filter design based on 'windows' (fir1, fir2) - equiripple design (remez) Which method is the most used (in education, in industry)? W...

Hilbert transform & analytic signals

Hi Guys, I've been modeling (with MATLAB) the Hilbert transform for use in generating the analytic signal (a complex signal) corresponding to a real signal x(n). That is, I'm computing a complex signal whose real part is x(n) and whose imaginary part is the Hilbert transform of x(n)....

Re: Complex FIR Filter Design - Notation in Preuss' IEEE Trans. Paper

Brandon skrev: > Is anyone familiar with the following paper? > > Preuss, K, "On the Design of FIR Filters by Complex Chebyshev > Approximation," IEEE Trans. Acoust., Speach, Signal Processing, vol. > 37, pp. 702-712, 1989. > > The author uses a notation I am not familiar with. Speci...

Re: FIR filter and time delay

Thanks. Looking at the page: http://www-ccrma.stanford.edu/~jos/filters/Zero_Phase_Filters.html It seems that my shifting of the coefficients of a FIR filter designed by the windowing method produces a filter where h(n) = h(-n), which fits the definition of a zero phase filter as per that pa...

Re: Parks-McClellan Algorithm

"FTChan" wrote in message news:b2c1978e.0403040410.45923767@posting.google.com... > Hello, > > Can anyone tell me why when designing a low pass filter using > Parks-McClellan algorithm, the approximation must decrease > monotonically in the "don't care" region between the passband...

Re: free digital filter design software

mughat wrote: > As a student I have been using matlab "Digital filter design2" for designing > the filter and generating/exporting coefficients for my digital filter. Is > there any free software out there that can do the same? ftp://ftp.mission-systems-inc.com/outgoing/Parks_McClellan h...

Re: kalman filter diverging?

Tom writes: > It is only because of multivariable problems that we have to delve into such > things in the first place. H infinity seems to be far better and much more like > the classical solution. Poppy cock. It's just another way to pose the problem; it has some advantages over th...

how to apply 2D FIR filter to an image using MATLAB?

Hi all, I have used remez function to design a 1D FIR filter and converted it to a 2D FIR filter using ftrans2. However, wat commands in matlab can i use to apply this 2D FIR filter to my image? thks.. ...

Re: Additional Real Poles?

On Sun, 08 Jul 2007 14:03:22 -0500, Tim Wescott wrote: > > I want to make a nice little optimal filter finder in Scilab, for times > just like this -- I want to be able to tell it the amplitude (and possibly > phase) constraints, possibly after sampling and reconstruction, and have > it ...

Re: Equiripple FIR filter design

Fred Marshall wrote: > "jaan" wrote in message > news:gpCdnZ2dnZ1REL7UnZ2dnZSpuN6dnZ2dRVn-yZ2dnZ0@giganews.com... > > > > I have to build a lowpass filter: > > > > > > cuttoff freq = 0.1; > > > attenuation = 90 dB; > > > transition = 0.01; > > > passband ripple = 0.000275 dB; > > ...

Re: optimal filters

Tobin Fricke wrote: > What is an optimal filter? Well, it's this filter, see, and it's, like, optimal. :-) There are many different things that can be thought of as an optimal filter. In some areas, designing an FIR filter using a minimax criterion (e.g. using the Parks-McClellan / R...

Re: Smith-Barnwell Filters using remez exchange

Hima wrote: > I need to design Smith-Barnwell filters for N=4,8,16,32,64 in Matlab. [snip] You might consider posting in a MATLAB group to get more specific help than you've gotten here so far, but you should do a little more searching on your own first. > Where can I get remex excha...

My own FIR coefficients for 21061 won't work

Hi again. There is "bandpass filter demo" in demonstration programs for 21061 EZ-Kit Lite. It works something like that: -- cut here -- . . . #define NUM_TAPS 256 // uses fir.h file filled with 256 coefficients float pm coeffs[NUM_TAPS] = { #include "fir.h" }; float dm stat...