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non uniform sampling and interpolation

Hello, In another post I asked about interpolation and sampling and I got some good response. After reading them, I am now interested in non uniform sampling and interpolation. What I am interested is to solve following type of problems: Assuming I have a 1D signal that the value...

interpolation accuracy, oversampling and fractional interpolation

Hi all, Interpolation of a sampled signal x(n) to generate an up-sampled signal y(n) can be represented mathematically as: y(n) = x(n/L) /* here L is the intrpolation factor. Regardless of the type of interpolation, if we increase the value of 'L' weather it will increase the accuracy of ...

please recomend algorithm for image surface interpolation?

Dear all, I am thinking of treating nature image like surfaces, suppose somehow there are some missing pixels in this image, and I want to do surface interpolation to reconstruct the missing pixels. Which surface interpolation algorithm can do this job best? I hope this surface interpolation a...

Karhunen Loeve interpolation?

I had the idea to try interpolation based on KLT. I tried searching for this with 4 search engines and only found one paper that mentions this concept in passing, but without a citation. Any ideas where I might find out more about such interpolation? ...

Re: Spline Interpolation and cubic interpolation

Ron N. wrote: > robert bristow-johnson wrote: > > for 3rd order polynomial interpolation, it's usually 4 data points (and > > you're interpolating between the inner two data points). > ... > > a 3rd order Hermite interpolation polynomial will match the 0th and 1st > > derivative at...

Re: Interpolation

Anshu wrote: > Hi > > Does anyone know : > > Which interpolation method (in matlab or otherwise )is better for a non > uniform data grid with complex numbers and Why? > No. The best method of interpolation is finding someone who knows how to do it and paying him for doing...

Re: Interpolation techniques

"Anshu" wrote in message news:1133372397.189684.326960@f14g2000cwb.googlegroups.com... > Hi > > Does anyone know: > > Which interpolation method is better for a non uniform data grid with > complex numbers and Why? > > Thanks > Anshu First, interpolation of complex numbers:...

Pulse shaping + interpolation

Hello, I'm supposed to design a transmit chain with a root-raised cosine pulse shaping filter followed by some interpolation stages. The RRC-filter shall interpolate by 2, and its output shall be interpolated by 8, resulting in a total interpolation of 16. I'm told that the total characteri...

Linear Interpolation 'error'

Hello People When we perform Linear Interpolation given by the formula below y(n+v)=(1-v)*y(n)+v*y(n+1) where v is between 0 and 1 (http://ccrma.stanford.edu/~jos/pasp/Linear_Interpolation.html#12296) Is there anything like interpolation error? I mean what we do in MMSE. Your guidanc...

Convolution-based image interpolation

I'm looking forward implementing image interpolation in one dimension at once, however I don't really know how to do it. Linear interpolation doesn't fit me good, I need something better, more like cubic spline interpolation, but the only problem that well implementing it doesn't sound like su...

Interpolation matrix

I'm trying to define a couple of common signal interpolation/ resampling methods as a matrix operation, i.e. y = W z where, y is the interpolated data vector of dimension m x 1 W is the interpolation matrix of dimension m x l z is the original data vector of dimension l x 1 I'...

Interpolation noise when we resample the irregularly sampled data regularly

Hello to all, Dear i am trying to resample the irregularly sampled data regularly, in order to apply the standard spectrum analysis techniques on it. For this purpose i am using linear interpolation. But there exist interpolation noise, so kindly tells me the methods to reduce the interpolation...

Interpolation and decimation

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 linear interpolation... Is there some other ways (documents) to do this ? If so, have you got some boo...

Re: Sampling, Again -- Updates

If I can jump in here, I have to say I don't follow why you call a zero ord= er hold an interpolation. I can see why it is *used* in the context of int= erpolation, because of its simplicity. But if it is being done in real tim= e where the subsequent data is not available for computation (beca...

best method for implementing an SRC

Hi, i would like to know which is the best method for implementing a integer sample rate converter (decimation /interpolation) in terms of quality. the conversion rates required are (2,4,8,16) both decimation and interpolation.i had tried with polyphase implementation and lagrange interpolatio...

interpolation filter

I was given a project that uses a 150 some point interpolation filter that upsamples digitized signal by 4. The digitized signals are sampled at rate of 6.4 uS. I do not know the band checking characteristics of the filter, only thing I know by looking at the code is that it upsamples by 4. No ot...

Re: Distortion Measurement, use FFT or not ?

> One question about amplitudes: > > If the frequency is in the middle of two bins, then can the true > amplitude still be calculated accurately ? If so how ? This can be done using interpolation. Look at any 4 point interpolation formulas like catmull-rom. for example if you compu...

Interpolation/FIR/etc... =]

Hi all! Here's a brief description of my application: -> I'm using a Stratix II FPGA to generate data samples and send them to an external DAC. -> Data is generated at rates from 1MSPS to 31.25MSPS. -> I've instantiated an Altera FIR Filter to mask shape this data. This filter also does an ...

machine learning vs interpolation

Greetings. I have been using neural networks and other machine learning tools for sometime time. Yesterday the following question popped up in my mind however: Why do we use machine learning tools when we could achive similar results with plain interpolation? Let's assume a noise free regre...

spline interpolation

hi friends, i have an interpolation function with 3 arguments. say h(x)=interp(x,y,z). i have to find out the value of h(x). so plz if any one knows it. mail it to me. thanks in advance rajasekar ...

Polyphase interpolation on an image with real value only

Hi all, I encounter some "problem" while using polyphase filter for interpolation. I have implemented a 8 zero crossing with upsampling of L=32. The image I used are a simulated image with 4 sinc impulse response near the four corner. All pixels values are positive. While performing ...

compare of two interpolation method

Hi all, As I know there are two interpolation method: 1. As many DSP book said, pading (L-1) zero points into space between two primitive samples, then lowpass filter it. Then we get the result. 2. linear cubic langerange interpolation. What is difference be...

Osculating/Hermite Interpolation on sampled data

I was thinking about osculating polynomial interpolation (of which Hermite is the first order member) in relation to sample rate conversion. As I understand it, osculating interpolation is a method where the interpolating function is a polynomial that matches a function's value(s) plus a certain...

Sinc Non-uniform Filtering

Hi all, At the moment I am working on interpolation filters for bandlimited signals. I was wondering whether anyone knows if there is a generalization of the sinc based interpolation method for a recurrent sampling error. For example the sampling times could look like t = [0.99 2.02 3....

Does time-domain interpolation help Manchester decoding?

My receiver comprises the following parts: 1) a 10-bit ADC running at fs (M samples/symbol), 2) a time-domain "interpolation filter" based on a comb-integrator stage with leaky integrator (sampling rate increase by N) does "interpolation" and acts as a dc-blocking filter as well, 3) a Manches...

zero-pad as an interpolation in frequency domain?

Hi all, I read somewhere that we can derive mathematically the zero padding equation to show that zero-padding is simply an interpolation in frequency domain. I tried to derive but still could not see the interpolation operator. Can you please tell me how to derive it from DFT formula? Tha...

Two stage interpolation : Optimum Order

Hello Rick, I worked out the math and here is the solution. For two stage interpolation I = I1 x I2, the optimum value of I1 can be given by I1 = (fp + fs + sqrt(I*Fs*(Fs - fs - fp)))/Fs where various quantities are: fp = passband freq in hz fs = stopban...

Interpolation

Hi Friends, I hav a signal(time_domain). 80ms/s. Sample distance = 12.5ns. I wana interpolate by factor 6. Wht should i use, interpolation filter? Amrish. ...

RBF interpolation

Hello, I want to implement RBF interpolation in Matlab for 2D signal (image) interpolation. What I like to know is: 1- Is there any freely available RBF interpolator source code for Matlab? 2- How can I implement it? I read a lot about its theory but I couldn't figure out how an...

2D sinc

I've always seen 2D sinc interpolation done in a separable fashion - interpolate along the x axis to the correct x-coordinate, and then interpolate the new values down the y axis to the correct y-coordinate. So if you have data defined on a grid, D(m,n), and you want to interpolate D(m1,n1+eps), ...

interpolation and filtering

Hello, I know that one way of interpolation is low pass filtering. But I think any other type of interpolation (such as spile or linre ,...) can be modeled as a low pass filter with different frequency response. Am I wrong? if no, where can I read more? for example what is the frequency...

Questions regarding polyphase filter

I am try to get a better understand of polyphae filter. There are several questions I wonder if I can get some help: 1) Relationship of polyphase filter and Different signal interpolation/decimation methods. One thing I am a bit confused about is the relationship between different curve fitting t...

Interpolation using IIR

Hello I'm trying to perform Channel Estimation on an OFDM signal by using various interpolation techniques between pilot symbols. The best method is to implement an interpolation filter (in the time domain, or in the freq domain using FFT). The problem is that in order to achieve a "good" FIR...

Interpolation by cubic splines

Is there any reason why cubic splines are a poor method for interpolation of audio signals such as speech or musical instrument sounds? Also, once upon a time I had a copy of a paper written by someone (if I recall correctly) who worked for E-mu systems talking about pitch shifting. Again IIR...

Re: Interpolation with FIR filters

in article 1132685207.779486.257470@o13g2000cwo.googlegroups.com, Anshu at anshu.dhawan@gmail.com wrote on 11/22/2005 13:46: > Can anyone please explain me about Interpolation using FIR filters? I > dont understand how they can be used for interpolation. might you understand how an FIR fil...

Pilot based interpolation

Hi all, i'd like to ask about pilot based interpolation in channel estimation of OFDM cells. I have a block of reference cells which i need to interpolate in time and frequency domain. An example : xo....................oxooxooxooxooxooo oo....................ooxoooxooooxoooox ox.............

linear interpolation, is it necessary to search for the neighboring points?

Hi all, Let's discuss scalar function y=f(x). I generate a 1-D Look-up table as follows: I sample non-regularly (i.e. not equally spaced partition) the x axis into N points. Then, store the y_i=f(x_i) , i=1,...,N into a 1D-LUT. To estimate y_j=f(x_j) for a x_j not in the grids, I use the ...

Multistage interpolation question

Hi Guys, some days ago "hsquared" posted a question about interpolating an audio signal from an original sample rate of 11025 Hz to 24000 Hz. As far as I can tell, that means an overall interpolation factor of 320/147. I played around a little bit, using MATLAB, with this notion of in...

about sinc interpolation

HI all My problem is : i have a signal x(n)(0 ...

Polyphase FIR interpolation filter

Hello! Im looking for a simple matlab code that illustrates an interpolation using polyphase implementation. I need this to understand the purpose with the polyphase structure. Maybe anyone knows some sources also? Thanks in advance ...