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# Discussion Groups > Remez

Comp.dsp is a worldwide Usenet news group that is used to discuss various aspects of digital signal processing.

We found 185 threads matching "remez"

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## EJ: Remez / PM for nonlinear phase 0

Fred Marshall - 2004-01-07 17:40:00
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 +1

Rune Allnor - 2003-12-22 15:15:00
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... 0

ctulk - 2007-03-21 21:07:00
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 +1

florent.mouchoux@laposte.net - 2004-05-10 09:39:00
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 0

renaudin - 2006-09-20 05:10:00
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 ? 0

ishaan - 2006-04-12 14:26:00
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 0

Kumar Appaiah - 2007-03-01 21:05:00
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 0

=?ISO-8859-15?Q?Marcel_M=FCller?= - 2006-06-22 04:48:00
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? 0

robert bristow-johnson - 2004-01-07 16:48:00
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 0

John - 2003-11-22 00:16:00
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 0

bharat pathak - 2008-02-20 04:21:00
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? 0

chenjc - 2007-03-03 16:20:00
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 +1

Rune Allnor - 2004-09-08 06:15:00
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 0

Izhak - 2003-10-28 09:41:00
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 0

westocl - 2008-02-19 08:27:00
> 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...

## Re: Optimizing Halfband Filter response +1

dbd - 2013-04-11 12:48:00
On Thursday, April 11, 2013 11:00:04 AM UTC-7, Kevin Neilson wrote: > Remember that a halfband is a Nyquist filter, which means that if you loo= k at the freq response (on a linear axis), it must be antisymmetric ... Remember that a halfband filter -can- be a Nyquist filter iff you make it a= ...

## Re: Optimization Theory Book 0

Rune Allnor - 2011-05-10 00:44:00
On Apr 29, 9:54=A0pm, Fred Marshall wrote: > And, consider this: > Optimization shows up in a lot of sub-applications: > Parks-McClellan's FIR filter design program is based on L-inf / minimax > approximation to optimize filter design with the objective of minimizing > the peaks of t...

## minimax and choosing weights 0

MA - 2005-09-16 16:45:00
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()] 0

Rune Allnor - 2004-08-31 02:56:00
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...

## Re: Problem with A-weighting filter 0

Robert Orban - 2009-12-17 19:46:00
In article , aclark@danvillesignal.com says... > This is very cool Robert, > > I have used a magnitude squared method which is not nearly as good as your > minimax solution. > > Do you have C or Matlab code that you could share for the minimax > calculations? I wrote the program ...

## FIR filter design (false advertizing?) 0

Paul Mennen - 2004-02-29 20:30:00
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!! 0

Fred Marshall - 2008-01-12 02:20:00
"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 0

Mark Borgerding - 2004-11-11 10:32:00
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? 0

Rune Allnor - 2007-03-30 10:12:00
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 0

Sam - 2004-11-22 16:34:00
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 0

Richard Webb - 2004-05-05 14:21:00
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) 0

seb - 2004-03-09 22:46:00
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: Freq. magnitude compensation 0

kaz - 2013-01-12 21:42:00
here is example of a tough filter passband ripple: < .001 stopband attenuation: better than 100dB N=150; amplitudes = [0 0 1 1 0 0]; frequencies = [0 .265 .27 .70 .705 1]; h = fir2(N,frequencies, amplitudes,chebwin(N+1,120)); you can also use firpm(old name remez) for equiripple des...

## Re: matlab firpm 0

robert bristow-johnson - 2005-06-14 14:08:00
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 0

Rick Lyons - 2005-11-08 07:35:00
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 0

Bevan Weiss - 2005-10-21 22:14:00
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...

## exact meaning of normalised frequency 0

enricophpdsp - 2010-11-09 09:11:00
hello, while designing any low pass filter we specify f= remez(234,[0 0.3 0.5 1],[ 1 1 0 0]); we write [0 0.3 0.5 1] instead of [ o *pi, 0.3*pi, 0.5* pi, 1* pi] saying that we are using normalised frequency. but according to the definition of normalised frequency it is the frequency divid...

## filter design 0

laki - 2005-08-30 14:38:00
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...

## Re: Increasing Notch depth using windowing 0

bharat pathak - 2008-05-26 22:24:00
better thing is to design your notch filter using remez exchange algo right from the specs you want. windows wont help in increasing notch depth, instead they will spreaden the width of the notch. Bharat Pathak Arithos Designs www.Arithos.com DSP Design Consultancy and Training Company....

## Re: Gibbs Phenomenon 0

Fred Marshall - 2008-07-06 15:23:00
"Dave" wrote in message news:d656b993-fb08-4a41-8806-0bfa0978e5b2@d77g2000hsb.googlegroups.com... > On Jun 28, 4:41 pm, Thomas Richter wrote: > > > I afraid you don't understand - they *do* form a (Schauder-) basis of > > L^2, provably. But this only implies convergence in L^2 (mea...

## Re: CIC filter and compensation filter - help 0

sludge - 2008-06-25 17:41:00
A CIC compensation filter is not an inverse filter. Rather, it compensates for CIC "droop" which is the roll-off shape of the CIC filter response. A good appoach is to use the remez exchange algorithm to build a FIR filter. For debugging, plot your filter responses and take note to the gain at...

## Hilbert transform & analytic signals 0

Rick Lyons - 2003-07-14 21:18:00
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 0

Rune Allnor - 2006-09-11 17:27:00
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 0

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 0

Fred Marshall - 2004-03-04 14:57:00
"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...
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