The FFT in MATLAB is defined as sum(x(i)*exp(-j*i*k/N)) and not sum(x(i)*exp(j*i*k/N)). The first version is traditionally used by engineers, the second version by mathematicians. Since MATLAB was written by an engineer (John Little), the engineering approach was used.

FFT is important for additive synthesis because it helps us to estimate the values for the oscillators that produce the partials of the synthesised sounds. See similar questions...

No, there is not a single wire between the fft and the ifft objects at all. They only write and read in the two tables (one is used for the real numbers, the other for the imaginary numbers). The fft and ifft objects have parameters like how many samples should be used to do the fft, how many samples the window should be shifted after processing, and which table to use as the shifting window. Note that there are none (read: absolutely zero) hidden wires inside CPS. See similar questions...

A9. The shoulder of the FST insert adds hoop strength around the bolt hole and provides a new flat surface around the hole that can fill in a chip or low spot. See similar questions...

Answer: The sample rate controls how many samples per second the sound card takes in. The higher the sample rate, the closer each sample is in time to the other samples. Essentially, the upper limit of the frequency range that you can see on the spectrum plot is one-half the sample rate. So a sample rate of 22050 means you can see frequencies up to 11025. FFT size refers to how many bins are used in the FFT analysis. See similar questions...

Here's a link to a very nice site that has full working programs available for all kinds of signal processing applications, from a spectrum analyzer to filtering, an oscilloscope, a sound level meter, and full vb source code is available for many of the apps: See similar questions...

Sometimes I can NOT make the bmp file. I get a file but it is just white! This means I can not save my work! To make a proper operation just double click the caption of a certain graphic panel an then select the required item ("Save Image to File" or "Copy Image to Clipboard") from the pop-up menu. The calibrate panel is intended for extra ADC. For sound card you should use system mixer (press Ctrl+X to call it). See similar questions...

Yes, pressing the <Enter> key will perform a single FFT spectral measurement and then automatically stop the analyzer. See similar questions...

How can I improve the spectral resolution of FFT result? The difference between two adjacent FFT points is ~40Hz, and I would like to make it 1-2Hz. See similar questions...

Only physical limitations of your RAM, hard disk space and CPU power apply. Please note that Sigview keeps all data in RAM or in system swap file; therefore, the size of signals should not exceed available RAM size to achieve best performances. All signals are internally stored as 4-byte float values so you can easily amount of memory needed to store and display the signal. To calculate 16 million samples FFT, you will need at least 1GB RAM. See similar questions...

By default, Sigview will calculate spectrum values with optimal parameters ? you don't have to bother with complicated things. Just load your signal, press FFT button and then choose Signal tools/Instruments and markers/Maximum position menu option, and an instrument with wanted result will appear along with the marker in the FFT graphics. See similar questions...

Yes, you can create overlay graphics by using context menus of each signal window, or by using Control window' context menu (select wanted signals first). See similar questions...

Since spectral analysis is used in many different fields, acoustics, vibration analysis, electronics, etc. , there are also many interpretations and units used for Y-axis values. Sigview should be useful for spectral analysis in all of these application fields and therefore are the units simply omitted. Each user can define own units by using Axes settings for the FFT window. See similar questions...

least for JIT compilers, Java is very fast (under certain conditions it reaches or tops C++ performance!) - and I think even on no-JIT compilers, FFT analysis is no problem in real time, of course depending on available processor power and resources. (Florian) See similar questions...

No. Unfortunately, the calibration data can't be loaded from a text file. Data has to be entered by hand on the calibration window. Please see the program manual for how to do it. RA only has A-, B-, C-weighting. Other weighting curves are not equipped. But you can create your own weighting curve by entering "Frequency" and "Level" values on the calibration window. There is no way to calibrate the soundcard automatically. But you can do it manually. See similar questions...

It is not possible to export the 3D graph directly, but the frequency analysis data by the octave band analyzer can be exported as a CSV format. Time series of frequency and level data is available. Using this data, similar 3D graph can be created. The frequency resolution of 1/1, 1/3, 1/6, 1/12, and 1/24 octave is available. The data export function is only available in DSSF3. See the following application for more instruction. See similar questions...