# How do we find out Fourier series of a non-periodic signal?

## How do we find out Fourier series of a non-periodic signal?

The Fourier series of a non-periodic function is really the Fourier series of its periodic extension. For example, there is a Fourier series of f(x)=x on [0,π], which is actually the Fourier series of the sawtooth wave that is formed by periodically extending f(x)=x.

## Can Fourier series representation be used for non-periodic signal also?

Fourier series representation can be used in case of Non-periodic signals too. In other words, Fourier series is a mathematical tool that allows representation of any periodic wave as a sum of harmonically related sinusoids. They are for periodic signals only.

**Why is the Fourier transform not periodic?**

The Fourier transform is a bijection of L2(R) back onto itself; this means that L2(R) is also the space of all possible Fourier transforms. However, the zero function is the only periodic function in L2(R), so we can conclude that continuous Fourier transforms of non-zero functions are never periodic.

### Can Fourier transform be applied to periodic signals?

Fourier Transform of Periodic signals. Suppose x(t) is a periodic signal with the period T, which admits a Fourier Series representation. Then, By putting this transform in inverse Fourier transform equation, one can indeed confirm that one obtains back the Fourier series representation of x(t).

### Is Fourier series only for periodic?

A Fourier series is only defined for functions defined on an interval of finite length, including periodic signals, as you can see from the definition of the Fourier coefficients (in the basis {einx}n∈Z) an=12π∫π−πf(x)e−inx dx.

**Are all Fourier series periodic?**

In mathematics, a Fourier series (/ˈfʊrieɪ, -iər/) is a periodic function composed of harmonically related sinusoids, combined by a weighted summation. The discrete-time Fourier transform is an example of Fourier series. The process of deriving weights that describe a given function is a form of Fourier analysis.

#### Is Fourier series only for periodic functions?

In the Fourier series can be expanded only function with a finite duration T. If T is infinite (the whole real axis) the function can only be represented by a Fourier integral. If this function is periodic, the Fourier integral will be a superposition of delta functions at frequencies that are multiples of 1/T.

#### Why Fourier series is only for periodic signals?

Fourier series is just a means to represent a periodic signal as an infinite sum of sine wave components. A periodic signal is just a signal that repeats its pattern at some period. The primary reason that we use Fourier series is that we can better analyze a signal in another domain rather in the original domain.

**Are all power signals periodic?**

Periodic signals are power signals; nonperiodic signals (pulses) are energy signals. When both power and energy are infinite, the signal is neither a power nor an energy signal….Kaiser Window Transform.

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## What is Fourier series of a periodic function?

A Fourier series is an expansion of a periodic function. in terms of an infinite sum of sines and cosines. Fourier series make use of the orthogonality relationships of the sine and cosine functions.