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Article on "Antialiasing filteres and multirate systems"

Hello all, Following a small research I conducted after posting my question about antialiasing of ADC samples to sci.electronics.design, I wrote a small and simple article to explain to myself, once and for all, the deal about analog & digital antialias filters, multirate systems and how thes...

multirate implementation problem

Hello, How to implement Multirate filtering on a DSP. My problem is how to have a flow in my code, How should the loop of the code be. This because my data is coming at a higher rate (4 MHz) and i am downsampling to slower rate (i.e 500 kHz). so there is no continous flow. Any suggestion or ...

Opinions on "Multirate Signal Processing..." by F.J.Harris?

Dear all, I was thinking of purchasing "Multirate Signal Processing for Communication Systems" by F.J.Harris. Has anyone here used this book, and if so, what are your opinions? Thanks in advance, -- Oli ...

Combine 2 multirate filters

I have 2 serially connected multirate filters. One has 18 taps and the other has 61 taps. The decimation factors are 2, 2. Now I want to combine the 2 filters into one. The new coefficient file has 78 taps by using convolution. In FDAtool, the order is 137 after cascading. I think it is from 137=17+...

ANN: Tyd-IP Code Generator V3.1 released

Version 3.1 of Tyd-IP Code Generator has now been released. Now supporting multirate filter design, designers can create a wide range of IP, including filters, FFTs, NCOs etc. which can be targetted at any FPGA or ASIC. Until, the end of May 2007, the multirate coefficient and VHDL module, will ...

design of iir bpf

Hi, I have to design a 6th order IIR BPF that will allow a multirate filter structure with D==3.How do i start?Is there a matlab function that does this,I mean also incorporates the multirate structure with design of an IIR BPF like butter().I wil greatly appreciate any guidance on this. ...

Re: Interpolation and decimation

"seb" wrote in message news:23925133.0401131910.7f22e0a2@posting.google.com... > Hello, > > i am looking for decimation and interpolation technique in order to, > given a sampling rate fs, obtain a new sampling rate like (a/b)*fs. > > A way to to do is to decimate and then use line...

Cascaded Integrator Comb and aliasing experts please help!

Please refer to www.intersil.com/data/fn/fn3651.pdf page 10 top and page 9 bottom. Please correct me if I assume something wrong. On figure 12 (pg 10) you see the aliasing profile of the CIC and how it does it translate to baseband. The filters performance can therefore be estimated. Quit...

Re: low frequency bandpass filters with high sampling rate

ssnyder wrote: > I am trying to design a set of bandpass filters for an audio spectrum > analyzer. Since human perception of pitch is spaced logarithmically > according to frequency, my low pitches have quite low and narrow bandpass > frequencies. This is a very good application for mu...

Multirate filters, MATLAB

Hello, Working on the design of decimation filter for multistage, sample rate conversion. I have designed a filter which represents G(z). With freqz(b,1,1024) I can plot the frequency response of the filter (the coefficients are in "b"). However, its output will be downsampled by, say M = 1...

Using Multirate algorithm for doing pitch shift effect ?

Hi, I'm trying to implements a pitch shift effect (up / down a .wav sound 44100Hz 16bit to different semitones in the range of around 1 octave). My problem is that I need to do it on about 15 sample simultaneously in real time. The classic pitch shift algorithms use too much of processor time...

Need Help: Multirate Systems

hi folks, I need sum help regarding multirate systems. I am currently working on a project where we r developing a Transfer Function model for Kalman Filter (Actually EKF). We have developed a Kalman Filter for Avionics System of an autopilot. In this filter we have GPS (measurements for KF) ...

multirate implementation on fix point DSP and efficiency

Hye, I have a question to try to find a way to improve my processing. I use a multirate filter with decimation. There is a decimation by 40. One FIr is used then decimation, and the 1 IIR with decimation, then a second IIR with decimation, then again oner IIR and decimation and at last one F...

Re: DSP (book) library (was: Oppenheim & Schafer)

"Multirate Systems and Filterbanks" by P.P. Vaidyanathan Indispensible DD ...

multirate filtering and computational gain

It is stated that in case of narrow transition band filters, multirate filtering provides us with a computational efficiency as compare to standard time invariant filters. The idea is to reduce the sampling rate (less number of samples) and to use simple, low order filters (less number of operations...

some suggestions on my octave-band spectrogram analysis in fixed point DSP implementation

i am designing one 1/3 octave band spectrogram analysis I use multirate filter bank to realize that spectrogram. It goes this way 1) first, from the biggest frequency value, I use three IIR bandpass filter, then calculate the std value. 2) Then decimate the input by 2 through(one 30 order...

Re: oversampling from 8khz to 44.1khz using multistage filter

> 1. Go to the library > 2. Get a classic book on multirate processing by Rabiner > 3. Don't ask any more stupid questions 4. Close all newsgroups. ...

Re: data anomaly detection

On Feb 15, 11:37 am, lakshmanan.meyyap...@gmail.com wrote: > I am trying to develop a data anomaly detector. I basically want to > detect clipped data, spikes, and drifting data to begin with. Any > suggestions on how to do it. What do you mean by drifting? If you're trying to detect hig...

Re: multirate filter design

Hello, I wrote a blog article a while ago, maybe it's useful (or maybe not...) http://www.dsprelated.com/showarticle/22.php The filter is designed at the intermediate high rate. Cheers Markus ...

Re: Which place is better for the interpolator?

"fjwoemcu" wrote in message news:6pOdnQMkVc9vLzrYnZ2dnUVZ_vShnZ2d@giganews.com... > > In an ADC - rate converter/filter - DSP chain, > the interpolator(cubic, linear...) may be placed between sigma-delta ADC > and rate converter/filter to approximate 310MHz-sampled data to > 300MHz-...

harris errata?

I'm working my way through fred harris's Multirate Signal Processing text and have found at least one error. Does anyone know of a site where errata have been published for this book? Maybe it's time to start an unofficial site. I'll make the first contribution! Hugh ...

Re: Book Recommendation

Multirate digital signal processing by N. J. Fliege Wavelets and filter banks by Gilbert Strang Digital Signal processing, system analysis and design by Paulo Diniz ...

Re: Applying hilbert transform close to DC

Aaron wrote: > > There is no silver bullet. You can do Hilbert transform using multirate > > filterbanks; that takes less computation. > > > That's useful information but as Al pointed out it won't really solve > my problem as I still require the phase shift close to DC and multira...

Re: Crossover networks. Can someone recall the name?

On Wed, 14 Dec 2005 16:44:44 GMT, Vladimir Vassilevsky wrote: > > ... assuming that it was designed as an approximation to a Gaussian > > response. > > No. Assumming the reasonable rolloff speed and passband flatness. You mentioned exp(-x^2) specifically. That's a Gaussian. > > ...

Re: FDAF (Frequency domain adaptive filter)

Refer to: J.J.Shynk, Frequency Domain and Multirate Adaptive Filtering, 1992, Signal Processing Magazine. The performance of the algorithms is usually evaluated using white noise and the stepsize should be taken into account also. Leans Nelson ...

[Q] How can the chirp-z transform be used in resampling?

DSP Gurus: I'm familiar with the classic interpolate-filter-decimate approach to multirate DSP. I've heard that the chirp-z transform can be used to resample a signal also. Can anyone provide additional information or references (other than Google search results)? Thanks, OUP ...

Re: Proof of decimated signal spectrum

The proof the spectrum for decimated signal is given elegantly in the reference below : Multirate systems & filter banks : P.P. Vaidyanathan (ISBN 0-13-605718-7) Pages :103-105 Regards, Yogesh P G Bangalore , India ...

summer school/course

Hi guys, I am looking for some summer school/courses in Euro or USA 2007 regarding: multirate, subband signal processing OR beamforming, microphone array But it is really hard to find those summer school/courses. Does anybody have any clue? Your help is really appreciated! Best regar...

Re: Polyphase FFT Filter bank

If I'm following you correctly, you want to use the output of the polyphase legs as the input to the FFT (ie with D legs, you use a D-pt FFT). Don't FFT an individual leg, and don't add the legs and FFT that. I could be wrong however. Check out Fred Harris's multirate DSP book for more info. ...

Re: Organising the archives of Comp.DSP

Hello Stephane, here are some more category suggestions - Theory -> Coding and Information Theory - Theory -> Multirate Signal Processing (Interpolation and Decimation) - Theory -> Wavelets and Filterbanks - Theory -> Simulation/Implementation in Fixed Point - Theory -> Modulation - The...

dspGuru Multirate Code Question

Hi, In interp.c - interp(), the while loop decrements the input sample counter first. while (--num_inp > 0) { So won't it miss the last input sample? Not that you would ever call interp() one sample at a time, but if you did, it would do nothing. --num_inp would make the 1 a 0 and th...

Re: Filter Bank References

Michael, "Multirate Systems and Filter Banks" by P.P. Vaidyanathan is a wonderful reference. Also, "Wavelets and Subband Coding" by Vetterli and Kovacevic is also ok. hth, cf "M. Wirtzfeld" wrote: > > Hello, > > Does anyone have good references on the topic of filter-banks...

Re: Newbie questions inspired by Re: Complexity of not 2^n FFT

Rune Allnor wrote: > > Nevertheless, most DSP books I know of on the primer/intro/intermediate > levels do include a discussion of these issues. My favorite, "Digital Signal Processing" by Proakis and Manolokis does. I've rarely been let down by it when I want to understand somethin...

Re: Interchange digital filter and downsampler

A filter H(z^m) before the downsampling can be implemented alternatively as H(z) after the downsampling. That may be sort of trivial, still it's in multrate textbooks. A general H(z) filter before the downsampling cannot be implemented after the downsampler in the general case: The former might b...

mixing pcm

hello, be aware, I'm new to DSP algorithms :) I have more pcm streams. first I have to change the sample rates of some pcm streams and than I have to "add" all streams in a (new) pcm stream (with a given sample rate). How can I do this? As I read on the dspguru.com, changing the sample ...

Re: polyphase filterbank

Andrew Xiang wrote: > Does any have an efficient implementation of polyphase filterbank in C? M=32 > There's a not-too-shabby one at http://www.dspguru.com in the FAQ section (under Multirate filters). -- Jim Thomas Principal Applications Engineer Bittware, Inc jthomas@bit...

Re: IIR band pass filter design query

Hi, Is it so that "high Q" in your requirement translates into "steep edges"? If so, some thoughts: Under some circumstances it may be better to -downconvert the signal in the digital domain to 0 Hz, -use complex *lowpass* filters -and translate back up to the center frequency. Maybe...

FIR Interpolation question

This question relates to the Multirate FAQ at the dspGuru site: http://dspguru.com/info/faqs/multrate/interp.htm I have a 256 element array that I want to interpolate at a variable density, between 4 and 10. Let's take the first case, i.e. the interpolation factor or density, L = 4. Thus...

A question from Vaidyanathan's "Multirate Systems" book

Hello Earthlings, I recently ran across some material in Vaidyanathan's "Multirate Systems and Filter Banks" DSP book that discusses a way to improve the computational efficiency of polyphase filters used in non-integer decimation applications. Vaidyanathan's description (starting...

Re: Downsampling by 2: What happens the Spectrum? (Not the Fourier Transform).

> Y(e^jw) = 0.5 [X(e^jw/2) + X(e^j(pi+w/2))]. (A) > I have a problem with your equation (A) above. I can't see straight away > why you get two terms there. Have a look at Gilbert and Strang "wavelets and filterbanks" bottom of page 91 or Vaidyanathan "multirate systems and filterbanks" t...