## Forums Search for: Windowing

## seeking formula for Fourier xform of Hamming family of windowing functions

inCan someone please post a closed form *formula* for (not just a plot of) the Fourier transform of windowing functions in the Hamming family of...

Can someone please post a closed form *formula* for (not just a plot of) the Fourier transform of windowing functions in the Hamming family of such functions, or at least post link(s) to web page(s) containing such a formula. Thanks in advance, -Michael

## Windowing: Resolution vs dynamic range

inWikipedia has an informative page on Window functions. See this paragraph for context on dynamic range vs resolution: ...

Wikipedia has an informative page on Window functions. See this paragraph for context on dynamic range vs resolution: https://en.wikipedia.org/wiki/Window_function#Windowing The second part of that paragraph references tradeoffs between dynamic range and resolution. I'm assuming that the reference to 'dynamic range' means 'difference between center peak and nearby lobes', This woul...

## FFT Windowing and Transmit Pulse Shaping

inSo I'm pretty confused about something.While studying DFT windowing, I saw how rectangular window has lowest bandwidth compared to Hanning...

So I'm pretty confused about something.While studying DFT windowing, I saw how rectangular window has lowest bandwidth compared to Hanning window( which is basically raised cosine), but higher side-lobes. But in all pulse shaping filter tutorials, apart from minimizing ISI they describe how the bandwidth of the rectangular pulse is almost twice the raised cosine pulse ( for alpha=0). What am I ...

## hann window for PAPR reduction

inI'm using hann windowing for PAPR reduction. After windowing the peak value and average value of signal reduces and overall PAPR increases after...

I'm using hann windowing for PAPR reduction. After windowing the peak value and average value of signal reduces and overall PAPR increases after dividing peak value with average value.what should i do to maintain the average value of the signal and to reduce only peak value? --------------------------------------- Posted through http://www.DSPRelated.com

## Windowed FFT power and amplitude spectrum

inHere is another fascinating question on FFT spectrum!! I am trying to find how to incorporate the normalisation factors when windowing is...

Here is another fascinating question on FFT spectrum!! I am trying to find how to incorporate the normalisation factors when windowing is applied to the time series before FFT is applied. When windowing (eg Hanning, flat top etc.) is applied to the time series, the amplitude of the time series obviously changes. In this case, how do we represent the power and amplitude spectrum in the freque...

## thx for clay and julius, 'Still mathetical problem, but for AM demodulation with FIR filter"

inClay, thanks for your opinion... my problem is the mathematical equation for how the FIR filter to process demodulation for AM. oya, bout the...

Clay, thanks for your opinion... my problem is the mathematical equation for how the FIR filter to process demodulation for AM. oya, bout the windowing method, u tell me...i found the equation for bandpass filter ideal. i read a book, and i got the equation for unideal filter. is it h=w.hd? h:transfer function unideal w:windowing coef. hd: transfer function ideal filter and do i hav...

## DFT Leakage

inHi, A signal is composed of the sum of two sinusoids, and none of them has a period matching the transform size. There is DFT leakage after the...

Hi, A signal is composed of the sum of two sinusoids, and none of them has a period matching the transform size. There is DFT leakage after the FFT. Is there any other solution than windowing? Thank you.

## Guard Interval removal methods

inhi all! i'm currently working on my thesis about FFT windowing.. but i'm a little short of ideas on how to remove the cyclic prefix components in...

hi all! i'm currently working on my thesis about FFT windowing.. but i'm a little short of ideas on how to remove the cyclic prefix components in the receiver.. i can't seem to find a literature that points specifically on this issues.. and one more thing, does timing synchronization is relevant on this problem? thanks before for the help..

## Cepstrum problems

inHello, I'm getting a lot of noise on my cepstum plots, and I wondered if I'm creating them correctly. Even when I play a simple sinusoidal...

Hello, I'm getting a lot of noise on my cepstum plots, and I wondered if I'm creating them correctly. Even when I play a simple sinusoidal sound, I'm getting spikes at certain places, but unstable at other note pitches. I can't currently see how anyone could track pitch if it's right. I tried all combinations of step and FFT point sizes, plus different windowing functions. Also, from th...

## SNR estimation using a windowed FFT

inHi, What is the best way to estimate the SNR of a sinusoidal signal in white noise using an FFT? For the best SNR estimate, is it better...

Hi, What is the best way to estimate the SNR of a sinusoidal signal in white noise using an FFT? For the best SNR estimate, is it better to do one long FFT or to break up into smaller FFTs to average the noise power? Also does windowing have an effect on the measured SNR? Thanks, Rizwan

## Cyclic suffix in xDSL

inHi every body, My question is: In vectored DSL transmission; what are the main drawbacks of reducing the length of the cyclic prefix ?, I suggest...

Hi every body, My question is: In vectored DSL transmission; what are the main drawbacks of reducing the length of the cyclic prefix ?, I suggest the increase of NEXT (Near end crosstalk) but if that is the case, is it possible to relay on windowing and puls shaping to overcome the effect of NEXT. Thank you AMAY

## FFT and windowing for a newbie

inHi there, Just a quick question from a DSP beginner here. I'm doing a college project on basic speech recognition, and I have some questions. I...

Hi there, Just a quick question from a DSP beginner here. I'm doing a college project on basic speech recognition, and I have some questions. I am told to use a 256 point FFT with a hanning window and 50% overlapping. This then produces a number of FFT windows right? (for example, in a 512 sample sound file I will have 3 windows). Then I have to perform an FFT on them. I then need to apply a...

## Re: Windowing in the Frequency Domain

inRune Allnor wrote: .. > > Find the link to the Harris paper, and download it. As it is scanned, > > some of the figs have lost definition;...

Rune Allnor wrote: .. > > Find the link to the Harris paper, and download it. As it is scanned, > > some of the figs have lost definition; apart from that is is very readable. > > As a matter of principle, I don't endorse copying and > re-publications of copyrighted material. Whatever other > differences of opinion there might be between Dale and > me, I would be very surprised if we disagr

## what is lag-domain processing?

inHello everyone, reading one of the classic papers about windowing, Nuttal's "Some Windows with Very Good Sidelobe Behaviour", I struggle with...

Hello everyone, reading one of the classic papers about windowing, Nuttal's "Some Windows with Very Good Sidelobe Behaviour", I struggle with the sentence on page 86 "When the weighting is applied instead in the lag domain,...,rather than in the time domain...". Could anyone tell me what is meant with the term "lag-domain", since I have no clue and can't find any enlightening explanation...

## reply again

Thanks a lot ! The 'scallopping loss' solves the problem. However this is still "black magic" as I do not fully understand the bin centered...

Thanks a lot ! The 'scallopping loss' solves the problem. However this is still "black magic" as I do not fully understand the bin centered tones idea. My data is a random data ,radiation gathered by the NA through waveguide from the antenna. How can I know that those signals are not bin centered ? And why halfway ? Can't they be somewhere in-between ? Also question about windowing. The gain I ...

## Window Presum FFT

inHi everyone, I would really appreciate if someone answers to my question. I was trying to learn about presum windowing, and I found this...

Hi everyone, I would really appreciate if someone answers to my question. I was trying to learn about presum windowing, and I found this article http://archive.chipcenter.com/dsp/DSP000315F1.html I am trying to understand the idea. I did a quick matlab simulation on this subject, and it is behaving as it's been explained in this article. So basically, let's say, if we have a hamming win...

## FFT: Zero-padding, Windowing - What order?

inHi, I have a question regarding FFT: If I want to calculate the FFT of a signal I would extend the signal to the next power-of-2 length to...

Hi, I have a question regarding FFT: If I want to calculate the FFT of a signal I would extend the signal to the next power-of-2 length to exploit the properties of the FFT. This is done using a simple zero-padding. If I window my signal to reduce leakage, when should this be done? Before or after the zero-padding? Thanks! Kind regards Marc

## Windows C++ Base Program

inI am in the process of building my own PC based sound meter to measure the effects of the highway going in by me. I have no problems with...

I am in the process of building my own PC based sound meter to measure the effects of the highway going in by me. I have no problems with building the HW nor the DSP software. However, to speed up the work I am looking for a shareware Microst C++ code that has the basic windowing infrasture in place to graph the signals. I will add my own specilized routines to handle the calibration, pow...

## When is a "boxcar" window legitimate

inI think I know 2 things about windowing: 1. Using an appropriate window can reduce smearing when analyzing a signal by performing a...

I think I know 2 things about windowing: 1. Using an appropriate window can reduce smearing when analyzing a signal by performing a DFT, DCT, or similar. 2. It works because it reduces any discontinuity of signal and at least it's first derivative at start/end of sample when considering it as one period of an infinitely repeating signal. *UNDERLYING _BASIC_ A...

## FIR LPF Filter Designing by windowing

inHi, I am using FIR digital filters,but since i am new to this concept,i have stuck at one doubt.Please help me out. i am designing a LPF having...

Hi, I am using FIR digital filters,but since i am new to this concept,i have stuck at one doubt.Please help me out. i am designing a LPF having 6Hz & 30Hz passband & stopband edge freq Also Fs(Sampling) is 512Hz with hamming window. I have got the filters coefficient (which are a real one)by implementing it in matlab but on the site from where i am taking guidance of this topic they have got coef...