about sinc interpolation

Started by p13dou in comp.dsp12 years ago 2 replies

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

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


Digiatal Sampling correction Interpolation/Decimation in e OFDM Modem

Started by nqh in comp.dsp12 years ago

Hi all, My project is Digiatal Sampling correction Interpolation/Decimation for application in flexible OFDM Modem. I'm implementing in Matlab...

Hi all, My project is Digiatal Sampling correction Interpolation/Decimation for application in flexible OFDM Modem. I'm implementing in Matlab the 5_taps optimized interpolator which will improve the performance for long data OFDM bursts. I used control parameters basepoint index (m(k)) and fractional interval (mu(k)) (reference to FM Gardners article "Interpolation In Digital Modems---PART1: ...


Does time-domain interpolation help Manchester decoding?

Started by in comp.dsp10 years ago 4 replies

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...

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 Manchester decoder based on a oversampling & counting algorithm decoding the interpolated signal and runni...


Polyphase FIR interpolation filter

Started by kungcoccos in comp.dsp11 years ago 4 replies

Hello! Im looking for a simple matlab code that illustrates an interpolation using polyphase implementation. I need this to understand the...

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


Complex signal Interpolation

Started by Anshu in comp.dsp13 years ago 2 replies

Hi I am sorry for repeating my question. May be I was not clear in explaing it before. I have a signal given by: s(i) =...

Hi I am sorry for repeating my question. May be I was not clear in explaing it before. I have a signal given by: s(i) = exp(-j*((2*pi*fc*(R(i))/c) + pi*slope*t.^2)); I want to interpolate this signal so that I can get values at points given by R(i) - a, where a is a constant. Can anybody please suggest me any interpolation technique? Thanks


implementing interpolation filter

Started by mahsad in comp.dsp9 years ago 5 replies

hi suppose you have a interpolation filter (with interpolating factor=3). now,how can i implement this filter in assembly language with only...

hi suppose you have a interpolation filter (with interpolating factor=3). now,how can i implement this filter in assembly language with only 3 cycles?


symbol timing recovery using interpolation filter method:suggestion

Started by Anonymous in comp.dsp14 years ago 17 replies

Hi, i am Sreenivas, i want to clarify from you, "Can the the symbol timing recovery be acheived by using interpolation filter method or...

Hi, i am Sreenivas, i want to clarify from you, "Can the the symbol timing recovery be acheived by using interpolation filter method or not ?". Actuall i am working at 32MHz sampling rate, can i apply this method at this rate for symbol timing recovery or not. It is mentioned in "Interpolation in Digital Modems-Part-1 : Fundamentals" by Floyd M.Gardner, Fellow, IEEE.-1993. that it "interp...


about linear interpolation

Started by tare...@gmail.com in comp.dsp12 years ago 3 replies

Hi How I can perform the linear interpolation onthe a vector A=[a,b] where size[A]=[150,12] to make size[A]=[370,12] plz reply me with some...

Hi How I can perform the linear interpolation onthe a vector A=[a,b] where size[A]=[150,12] to make size[A]=[370,12] plz reply me with some matlab code. Thanks


Suggestion for tapered sinc

Started by spasmous in comp.dsp15 years ago 10 replies

Hi, For interpolation, I'm using a truncated sinc function to get interpolation coefficients. It appears that I'm getting Gibbs ripple, as...

Hi, For interpolation, I'm using a truncated sinc function to get interpolation coefficients. It appears that I'm getting Gibbs ripple, as expected within this kernal. So I'd like to taper the sinc. Any suggestions? What about sinc(x)/x? Thanks.


difference between bicubic filter and bicubic interpolation on regular grid/bitmap

Started by Anonymous in comp.dsp12 years ago

In 2d is there a difference mathematically between a multivariate bilcubic (or bilinear, sinc etc) 'interpolation' and the 'filter' expression...

In 2d is there a difference mathematically between a multivariate bilcubic (or bilinear, sinc etc) 'interpolation' and the 'filter' expression of the same name ? - For example taking the multivariate bicubic 'interpolation' expressed on the wikipedia page: http://en.wikipedia.org/wiki/Bicubic In comparison with a bicubic 'filter' using a weighted sum of values in a sub-grid: http://m...


Digiatal Sampling correction Interpolation/Decimation for application in flexible OFDM Modem.

Started by nqh in comp.dsp12 years ago 3 replies

Hi all, My project is Digiatal Sampling correction Interpolation/Decimation for application in flexible OFDM Modem. I'm implementing in Matlab...

Hi all, My project is Digiatal Sampling correction Interpolation/Decimation for application in flexible OFDM Modem. I'm implementing in Matlab the 5_taps optimized interpolator which will improve the performance for long data OFDM bursts. I used control parameters basepoint index (m(k)) and fractional interval (mu(k)) (reference to FM Gardners article "Interpolation In Digital Modems---PART...


Logarithmic Interpolation

Started by Michel Rouzic in comp.dsp13 years ago 38 replies

I've went through lots of posts on this group about obtaining a logarithmic-scaled FFT but that didn't help alot. What I am trying to obtain is...

I've went through lots of posts on this group about obtaining a logarithmic-scaled FFT but that didn't help alot. What I am trying to obtain is logarithmic interpolation. I could talk about what I'd need it for but since I can think about many things I might use it for, and since it doesn't make any difference to how it has to be implemented, I'd like this discussion to focus on logarithmic i...


Interpolation for Dummies

Started by Ian McBride in comp.dsp16 years ago 14 replies

I am trying to figure out interpolation (I have given up on decimation for now). My scenario is that I have 8 ksamples per second audio (from...

I am trying to figure out interpolation (I have given up on decimation for now). My scenario is that I have 8 ksamples per second audio (from a phone line), and I want to interpolate it to 96 ksamples per second. I know my audio is band limited within 0-4kHz, but other than that it could be anything -- human voice, modem tones, etc. I understand the most basic concepts. I could use lin...


Interpolation with JAVA like MATLAB

Started by Walker in comp.dsp13 years ago 10 replies

Hello! I'm programming an Applet in JAVA and I need a method/class/library that makes Interpolation like function "interp" in MatLab. My...

Hello! I'm programming an Applet in JAVA and I need a method/class/library that makes Interpolation like function "interp" in MatLab. My trouble is easy, I have a data vector with 320 samples and I must to convert it in a data vector with 320*16 samples using Interpolation of the originals samples. Any Idea? Somebody know this method/class/library ? Thanks to help me, i really need it. ...


Sinc Non-uniform Filtering

Started by mikedoesnotknow in comp.dsp11 years ago 1 reply

Hi all, At the moment I am working on interpolation filters for bandlimited signals. I was wondering whether anyone knows if there is a...

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 3.03 3.99 5.02 6.03 6.99 ...] It is quite easy to compute the sinc coefficients if you wa...


Deterioration SNR for cubic interpolation?

Started by alex65111 in comp.dsp11 years ago 1 reply

How it is possible to estimate change ( deterioration) SNR on an output of cubic interpolation at various number of samples on a symbol, for...

How it is possible to estimate change ( deterioration) SNR on an output of cubic interpolation at various number of samples on a symbol, for qpsk signal? How much will be worse snr (for cubic interpolation) in case of 4 samples on a symbol in comparison of 10 samples on a symbol, for qpsk signal? Whether there is any technique for the answer to a question?


Polyphase structure for interpolation

Started by Clay in comp.dsp7 years ago 6 replies

Hi everyone, I'm new to DSP and I have just been recently learning the concepts. And I don't really understand the polyphase filtering. I...

Hi everyone, I'm new to DSP and I have just been recently learning the concepts. And I don't really understand the polyphase filtering. I have to increase the sampling rate by a factor of 8, and I'm doing that in two stages: interpolate by 2 in the first stage, then by 4. I get the basic interpolation process which involves upsampling the signal by a factor of L (inserting zeros in between ...


basic question on sinc interpolation for sampled sequence

Started by Nasser M. Abbasi in comp.dsp9 years ago 8 replies

Hello; I wrote a small program to implement the sinc interpolation formula as shown in many places such as...

Hello; I wrote a small program to implement the sinc interpolation formula as shown in many places such as here http://en.wikipedia.org/wiki/Whittaker%E2%80%93Shannon_interpolation_formula This is just to help me learn things. It seems to work ok, but I am still not sure about one thing, so I thought I'll ask here. I'll give an example, and make it very simple. I use x(t)=cos(t)...


books on hardware implementation for interpolation, look-up table, searching, etc..

Started by A.E lover in comp.dsp10 years ago 3 replies

Hi all, Can you please recommend me some handbooks about how to do some tasks such as interpolation, look-up table, searching, sorting,...

Hi all, Can you please recommend me some handbooks about how to do some tasks such as interpolation, look-up table, searching, sorting, etc,... in hardware? (with bitwise operations)? I really want to learn about this kind of stuff but do not know any book about this. Thanks,


Parabola interpolation

Started by HyeeWang in comp.dsp10 years ago 12 replies

I learned a parabola interpolation equation from some articles, but I am puzzled with the rationality. It is as follws. E = I - 1/2*[ R(I+1) -...

I learned a parabola interpolation equation from some articles, but I am puzzled with the rationality. It is as follws. E = I - 1/2*[ R(I+1) - R(I-1)] / [R(I+1) + R(I+1) - 2*R(I)] where, 3 given points is R(I-1),R(I) and R(I+1),which form a parabola. R is the resultant function. How can get the extreme point E of parabola by that equation? cheers HyeeWang