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Re: FFT and log-frequency scale

Bergers wrote in message news:20030623222741.09790.00000997@mb-m01.aol.com... > Hello, > > Can anyone point to papers or tutorial on how to convert the output of an fft > to a log frequency scale? A search of the web through yahoo and the IEEE does > not yield any useful results. ...

Re: Which processor for processing guitar output

> Our university team is restricted to a budget of 375 USD, is there > anything in the sub 200 USD range that can satisfy my requirements? EBay is your friend... > I think we will stick with FFT because we don't have the expertise to > come up with algorithms for Wavelet transforms. It also...

Re: FFT and log-frequency scale

> Subject: Re: FFT and log-frequency scale > From: "Dale B. Dalrymple" dbd@abac.com > Date: 6/23/2003 11:21 PM Eastern Daylight Time > Message-id: > > > Bergers wrote in message > news:20030623222741.09790.00000997@mb-m01.aol.com... > > Hello, > > > > Can anyone point to papers...

Re: Time-Frequency Resolution, Uncertainty Principle

PaavoJumppanen@iname.com (Paavo Jumppanen) wrote in message news: ... > allnor@tele.ntnu.no (Rune Allnor) wrote in message news: ... > > yates@ieee.org (Randy Yates) wrote in message news: ... > > > "Hristo Stevic" wrote in message news: ... > > > > Hi > > > > > > > > ...

wavelet coefficient

hi all, how to calculate the wavelet coefficients for Daub-4 or Daub-6 wavelets? thanx and regards ...

Uncertainty limit!!

Hi, After 11 PM message: Can anybody help with the uncertainty limit of both Wigner distribution and Wavelet transform and give some light comparing on that ground? Regards, Santosh ...

Re: DSP algorithm for Image compression

DCT and IDCT for Jpeg. or Wavelet Transform for Jpeg 2000. "SHIBASIS" wrote in message news:aeb97571.0307221102.2d3dec81@posting.google.com... > Dear All, > I am a new member in this group, I am developing a image compression > algorithm on a texas dsp tms320c6701.The algorithms need...

Re: Fixed Point issues

Dear Dirk, My "scheme" for the fixed point implementation is this : a.Multiply filter coefficients with 2^precision b.Multiply inputs with 2^additional bits c.Convolution d.Divide output with 2^precision e.Mask the result with 3,to find the two least significant bits(lsb) of it (is this where...

Wavelet ON/OFF

I know this question is awfully silly. But I just want to make sure that it IS indeed as simple as this and that I havent missed anything. I have a file of raw data bits from a signal capture board. I havent seen this file. But I know it's rather huge and that it has 0s and 1s. I need to run...

Re: What's difference between Active NC and Adaptive NC

To answer the more general question first. Active noise cancellation involves producing a physical anti-noise to cancel the undesired noise. An application of this is the reduction in the noise of a manufacturing machine in the area of the operator. The disadvantage is that the noise reductio...

Re: image in image search

"Andreas" wrote in message news: ... > Hello! > > I am trying to implement an algorithm which is supposed to find the best > match of a given (small) image in a larger image. > > I have thought about a few (naive) ways of implementation, and recently have > been pointed at FT and...

Re: Any books about video processing

Helen wrote: > for introduction? > Thanks a lot! You might want to provide some more details... Do you want to get involved in designing / implementing codecs, or understanding how they work, or do you just want to use them? The major difference from video codecs to static image codecs...

Re: OT integral of odd function

Tak-Shing Chan wrote in message news: ... > I think the research is flawed: Well... a current research issue does not perform perfectly. The below took me some three minutes to assemble, one word came only after I had written the post and proof-read it. I miss three (four) out of ...

How to work smarter: which viz tools ?

hey everybody, i want to get a quick survey of what visualation tools people use when developing C/C++ signal processing code, i'm looking for recommendations on tools that i can use during development/debugging/testing to easily "see" my data. for example lets say my algo. requires th...

Definition of wavelet?

Hi comp.dsp, One quick question: does the difinition of wavelet require at least one vanishing moment, or not? In other words, can the discrete filter {2, -1} be considered as wavelet? (i believe it has the corresponding scaling function: {2, 1} - and they form the orthogonal basis together...

Re: OT? -- How far can linear supperposition be stretched

Richard Owlett wrote in message news: ... > Rune Allnor wrote: > > > [snip]> > > > > Sure. A Gabor plot, [snip] > > Never heard of one so did Google search for "Gabor plot". Not much ;) > But lead to searching "Gabor expansion" whose first hit was > http://www.nari.ee.e...

shift theorem for wavelets (with application to OFDM)

In an OFDM signal, if the symbol window (of N samples) is misaligned at the input to the FFT, the constellation points on each tone are rotated by a certain amount. To undo this effect we use the Fourier shift theorem which allows us multiply by a complex exponential on each tone. I am using ...

wavelet question

hi all, Can anyone tell why wavelets are better than subband coding in image compression? thanx, sridevi ...

Re: which one is the most successful scheme to reduce blocky artifacts in low bit rate JPEG image?

Hi, > I don't know if they can be treated unitedly or not... I want to ask which > scheme is the currently best scheme to combat blocky artifacts? An encoding scheme that doesn't use blocks... There are many. JPEG2000 is one of them. You can even write up your own simplistic wavelet coder ...

Re: rephase my problem: how to reduce round-off error for hardware implementation?

Hi, > > However, for practical applications, the high-bitrate approximation might > not > > hold, and you might need a better model. Typically, an i.i.d model with a > > distribution that is centered around zero should hold, and in this case, a > > reconstruction point shifted towards ze...

Re: Audio morphing?

I suspect that they should be using wavelet bases. Any application ranging from compression, SNR improvement or for that matter, this kind of morphing, all that matters is "representation" or "model". In any case, what they should be doing while morphing is to get the two or more signals to be m...

Re: Why minimising in the mean-error sense.

Bob Cain wrote in message news: ... > Matt Timmermans wrote: > > > > - Orthogonal transforms that preserve energy, like the Fourier transform, > > also preserve squared error. So if your goal is to minimize squared error, > > you can do it in the time or frequency domain and it w...

1D Discrete wavelet transform(DWT)

Hello I have a little question concerning the discrete wavelet transform! Let's consider one dimensional signal having a frequency up to 2kHz ( we consider that the sampling frequency is then 4kHz)which is filtered with low and highpass FIR filters, let this be the first decomposition level!! ...

Re: time stretching for dictation - granular synthesis

gkustas@hvc.rr.com (George Kustas) wrote in message news: ... > > i am not sure that you would want exactly "granular synthesis" but instead a > > simple variant of the PSOLA (pitch synchronous overlap add) method or > > sometimes called WSOLA (windowed synchronous overlap add) method. > ...

Re: ANN and fingerprint processing

predictr@bellatlantic.net (Will Dwinnell) wrote in message news: ... > I don't disagree with neural networks as a choice for recognition, but > I think the original question was specifically about noise reduction > of the image, not recognition. > > -Will Dwinnell > http://will.dwinnel...

Re: Wavelet regularity condition

Matthieu Puigt wrote: > Hi, > > The bounds are -/+ infinity. > > For example, you can see it in this paper : > http://cm.bell-labs.com/who/wim/papers/overview.ps thank you Matthieu you are great! ...

Re: Need help

Medris wrote: > mlimber wrote: > > First of all, you didn't tell us what was wrong with it. Please > > clarify. Second, why are you using interrupts for this? Try getting the > > code working in main() without the headaches of interrupt processing, > > then move it into your real code. Thi...

Re: Relation between filter banks and wavelets

leonadavinci@gmail.com wrote: > How wavelets and filter banks are related? Why we use the second in > order to implement the first? In "A theory for multiresolution signal decomposition: the wavelet representation." _IEEE Trans. On Pat. Rec. and Mach. Intel._, 11(7):674-693, July 1989, Step...

Re: dyadic grid and wavelets

leonadavinci@gmail.com wrote: > In the following link > http://perso.wanadoo.fr/polyvalens/clemens/wavelets/wavelets.html#section4 > there is a dyadic grid. Can you explain me what this grid shows? > > thank you The dots show where a wavelet would be "centered" for a given translation ...

Re: eigen value

You bring up an interesting point. I am currently trying to analyse a signal in terms of its relationship to the signal of a subunit. One approach may be to make the sub-signal into a wavelet (and the "religion" of wavelets is displeased that I want to force my own fundamental wavelet on th...

Re: JPEG implementation on MATLAB

prakash wrote: > thanx and as u said it is an educational exercise iam doin this for my > project work , iam doing my MTech program and i need do this > implementation as a part of my [project work .plz guide me how to > implement transformation part(including inverse transformation) say ...

Re: Minimum phase filter design using cepstrum methods?

"Michael Numminen" wrote in message news: ... > Hi Ron! > > To your question, see below. > > "Ronald H. Nicholson Jr." skrev i meddelandet > news:c3ahbu$5cp$1@blue.rahul.net... > > I've run across a few web pages describing how to convert an arbitrary > > FIR filter to a m...

what is the nonseparable wavelet transform for 2D image?

I heard this a lot times, but don't know what it is and how to implement in matlab? Can anybody teach me a little bit on this? ...

seeking advice on study wavelet -- any good wavelet learning material

Dear all, Wavelet is really hard to learn and master. However I need to learn it by self-study. I have read Martin Vetterli's book and Mallat's book. For both books I can only understand the first 1/3 part of the books. I always understand the Haar example, but after that, math becomes dominan...

Re: Linear System Properties?

Till Crueger wrote: > On Fri, 26 Mar 2004 15:28:12 +0000, Randy Yates wrote: > > > > Hey Till, > > > > You're right - it isn't just sine waves that a linear system will not > > produce new frequencies of - ANY waveform will be unaltered in frequency > > by a linear system. > > > >...

Information on wigner-ville distribution

Hello I want to learn and simulate Wigner- ville distribution(WVD). I have a basic idea about time-frequency analysis like STFT and wavelet analysis. WVD is also a type of time-frequency analysis (isn't it?), but what is the underlying difference with respect to the above methods. Where ca...

Re: wavelets - vanishing moments - what are they?

Ben wrote: > In article , Ben wrote: > > > Hello, > > > > Can anyone give a _very_ simple explanation / definition of what > > vanishing moments are in the field of wavelets please? I'm reading > > Hubbard's the World According to Wavelets and the book keeps using the > > ph...

Mr. Lyons...

I'm happy to find out about your book, and just ordered the second edition. I discovered it during a quest to understand wavelets (I have no experience with signal processing but need it now). From the 42 customer reviews at Amazon it's clear you've written something that may help me understa...

Re: Speech Hiss Reduction

You might want to look at: "Donoho, D., Johnstone, Kerkyacherian, G. and Picard, D., "Wavelet Shrinkage:Aysmptopia?", J. R. Statist. Soc. B, vol. 57, pp. 301-369, 1995". Their Universal Thresholding Method works quite well at removing noise in images without distorting the image. The same shoul...

Re: 2D correlation in Q15 fixed-point format

[snip] > > > > > > Yes, 215 doesn't fit in a "signed 8-bit" format, so you should only > > > shift your numbers up 7 bits if TI's routine expects signed > > > information. If your image data is limited to 8 bits you won't suffer > > > much loss! > > > > > > What you've rev...