Cosine window function & signal with nonzero mean

1. What does a windowing function do?
2. Which window function is also regarded as raised cosine window?
3. What is window function in FFT?
4. What is window function in C?

What does a windowing function do?

Window functions perform calculations on a set of rows that are related together. But, unlike the aggregate functions, windowing functions do not collapse the result of the rows into a single value. Instead, all the rows maintain their original identity and the calculated result is returned for every row.

Which window function is also regarded as raised cosine window?

The Hamming Window: The Hamming window is another raised cosine window, but this time on a pedestal.

What is window function in FFT?

A window function provides a weighted selection of a portion of a time waveform for fast Fourier transform (FFT) analysis. It is generated by multiplying the original time waveform by a user-defined window function of some width. In this case, width equals two times the number of analysis lines.

What is window function in C?

In signal processing and statistics, a window function (also known as an apodization function or tapering function) is a mathematical function that is zero-valued outside of some chosen interval, normally symmetric around the middle of the interval, usually near a maximum in the middle, and usually tapering away from ...