# What is difference between Fourier and Laplace transform?

## What is difference between Fourier and Laplace transform?

Fourier transform is defined only for functions defined for all the real numbers, whereas Laplace transform does not require the function to be defined on set the negative real numbers. Every function that has a Fourier transform will have a Laplace transform but not vice-versa.

## How does Fourier transform relate to Laplace?

The Laplace transform evaluated at s=jω is equal to the Fourier transform if its region of convergence (ROC) contains the imaginary axis. This is also true for the bilateral (two-sided) Laplace transform, so the function need not be one-sided.

**What is Fourier transform used for?**

The Fourier Transform is an important image processing tool which is used to decompose an image into its sine and cosine components. The output of the transformation represents the image in the Fourier or frequency domain, while the input image is the spatial domain equivalent.

**What are the application of Laplace Transform?**

Applications of Laplace Transform Analysis of electrical and electronic circuits. Breaking down complex differential equations into simpler polynomial forms. Laplace transform gives information about steady as well as transient states.

### Why do we use Laplace Transform?

The Laplace transform can also be used to solve differential equations and is used extensively in mechanical engineering and electrical engineering. The Laplace transform reduces a linear differential equation to an algebraic equation, which can then be solved by the formal rules of algebra.

### What are types of Fourier series?

Fourier series is of two types- trigonometric series and exponential series.

**What exactly is Fourier transform?**

In mathematics, a Fourier transform (FT) is a mathematical transform that decomposes functions depending on space or time into functions depending on spatial or temporal frequency, such as the expression of a musical chord in terms of the volumes and frequencies of its constituent notes.

**What are the applications of Laplace transform?**

Laplace transform is an integral transform method which is particularly useful in solving linear ordinary dif- ferential equations. It finds very wide applications in var- ious areas of physics, electrical engineering, control engi- neering, optics, mathematics and signal processing.

#### How is a Fourier transform different from a Laplace transform?

Laplace transform transforms a signal to a complex plane s. Fourier transform transforms the same signal into the jw plane and is a special case of Laplace transform where the real part is 0. In Laplace domain, s=r+jw where r is the real part and the imaginary part depicts the oscillatory component.

#### Is the Fourier transform always conjugate in nature?

Following are the fourier transform and inverse fourier transform equations. Following table mentions fourier transform of various signals. • Fourier Transform of a real signal is always even conjugate in nature.

**When to use Laplace transform in signal analysis?**

Laplace transform would be heavily used in transient signal analysis, ie., to analyze not just the oscillatory (sinusoidal) component but also the decaying amplitude component of a complex signal or response of a complex system to an impulse. This would be important when a system has just received s

**Is the Fourier transform in the frequency domain?**

The Fourier Transform provides a frequency domain representation of time domain signals. It is expansion of fourier series to the non-periodic signals. Following are the fourier transform and inverse fourier transform equations.