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Questions tagged [windowing]

In signal processing windowing allows to work on overlapping segments of the signal.

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HIVE: Get all records where preceding record (by timestamp) is a specific value

I am doing pathing analysis where I need to see where one page leads to. How do I write a query that gets me all the records that have a preceding record of a specific value. For example: col1 timestamp a 1 b 2 a 3 c 4 b 5 e …
manjam
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multiple count(substring) with windowing psql 8.4.4

I am trying to create the following view, and I get the error below: I am able to do 1 count statement (if I remove the AS "Mod0") Is it possible to count multiple substrings, with the output count to a new column? create view portcnt as …
user375388
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NSOpenGLView drawRect does not get called

I am currently trying to create a simple cocoa NSWindow programmatically instead of using Interface builder (I have got my reasons to do so). this is a quick test: int main(int argc, char** argv){ NSWindow *mainwin; CocoaGLView…
moka
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sql how to extract the most common of values from a windowing function

I have data that looks like id channel amount date a PHONE 50 '1sep2014' a PHONE 100 '1oct2014' a INTERNET 20 '4oct2014' b PHONE 25 '2oct2014' b INTERNET 30 '3oct2014' c INTERNET 35 …
shecode
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Correct way to apply window function in fft

I understand why I need to use window functions in fft,I record a sine wave (16 bit pcm format), I have the sine wave audio record which I would like to analyze,I have recorded the mic audio into a byte array, transformed it back to the sample array…
just_code_it
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How do I apply the hanning function to my audio sample?

I am a university student. I am developing a music identification system for my final year project. According to the "Robust Audio Fingerprint Extraction Algorithm Based on 2-D Chroma" research paper, the following functions should need to be…
Hash_S
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Specific part of an impulse response matlab

I measure the impulse response of a microphone. At beginning of plot i have some delay and then highest value comes at 40 ms and decreases till 45 ms. When I take fourier transform, I only want to use the part between 35-45 ms. when I use different…
puCCa
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Windowing Transfer Function

I'm implementing a volume renderer and I want to use Windowing Transfer Function to enable the user to change the opacity of some regions. As far as I understood, there are three variables window, offset and scale The window is how much of my…
Lily
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iPad "draggable window"

When you load a view on the iPad it tends to fill the whole screen. Is there a way to create a "draggable windowed view" on the iPad?
bobobobo
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Choosing Specific Rows of a Matrix Matlab (Windowing Function)

I have a column vector and I am trying to write a function implementing somehow a variable windowing function. Meaning that i want to choose one row and skip a number of rows (this is the variable part), but not only skipping, i have also to set…
user36219
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Can you help me understand the inverse Fourier transform work?

I am trying to learn about Fourier transforms and using MATLABs FFT function I can transform a recording of me saying '1 2 3' into the frequency domain. As I understand it the resulting file contains a set of complex numbers which hold the magnitude…
thecolin
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2D FFT of an image shows some invalid values for high frequencies

I uploaded my 2D FFT magnitude image here: If you take a look at it, for high frequencies[right, left, top and bottom], only at around x and y-axis, there are some points with high power[yellow color]. These points shouldn't be in the resultant…
Mona
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How can I filter a windowing function for the max row number?

I am trying to get the max row in a partitioned result. How can I get the max row for each return where I partition by property number. What I want are the rows that are marked by 2 because that is the last value in the set. If the property number…
Axwack
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Unity3D, Monodevelop stuck minimized

I'm not sure how it happened, but it appears to be a persistent bug. Whenever I try to launch Monodevelop by double-clicking on one of my scripts in the assets browser, Monodevelop gets launched, but remains minimized. When I attempt to restore it…
Miles
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Compiler programming languages theory, computer usable computing and I/O parts

I started with a small theory of cmd and extensions. First of all was that it consists of compilation to object file, linkage and compilation to exe. The languages mainly consist of operators, keywords and directives which is compiled into machine…
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