The Endocrine System Essentials. 1  The endocrine system is made up of a network of glands. 2  These glands secrete hormones to regulate many bodily functions, including growth and metabolism. 3  Endocrine diseases are common and usually occur when glands produce an incorrect amount of hormones.
The Fourier transform is called the frequency domain representation of the original signal. The term Fourier transform refers to both the frequency domain representation and the mathematical operation that associates the frequency domain representation to a function of time.
after Fourierâs work that the signals did not have to be continuous in the time domain but. could instead be discrete data points. This led to the inception of the discrete-time. Fourier series and the discrete-time Fourier transform [2]. Four different Fourier representations exist: 1. Fourier series (FS) 2. Fourier transform (FT) 3. Discrete-time Fourier series (DTFS) 4. Discrete-time Fourier transform (DTFT) The discrete-time Fourier series that this chapter will primarily focus on is often referred to as the discrete Fourier transform, or DFT. This terminology is not to be confused with the discrete-time Fourier transform. The factor that determines whether to use a series or a transform is periodicity in