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.
FFT and IFFT are transform techniques. FFT which is a technique to analyse signal in frequency domain like if we see our ecg signal in time domain and are not able to find problem then we can take FFT of this signal and find out how many frequency components are present and analyse it better.