Howtosignalprocessing
- What is frequency spectrum of a signal?
- How do you find the frequency spectrum of a signal in Matlab?
- Why do we convert signal from time domain to frequency domain?
- What is log amplitude spectrum?
What is frequency spectrum of a signal?
Frequency spectrum of a signal is the range of frequencies contained by a signal. For example, a square wave is shown in Fig. 3.5A. It can be represented by a series of sine waves, S(t) = 4A/π sin(2πft) + 4A/3π sin(2π(3f)t) + 4A/5π sin(2π(5f)t + …)
How do you find the frequency spectrum of a signal in Matlab?
In MATLAB®, the fft function computes the Fourier transform using a fast Fourier transform algorithm. Use fft to compute the discrete Fourier transform of the signal. y = fft(x); Plot the power spectrum as a function of frequency.
Why do we convert signal from time domain to frequency domain?
For mathematical systems governed by linear differential equations, a very important class of systems with many real-world applications, converting the description of the system from the time domain to a frequency domain converts the differential equations to algebraic equations, which are much easier to solve.
What is log amplitude spectrum?
Log amplitude spectra are normally represented on a dB scale, and the dB units can be retained for the cepstrum (as there is no interaction with the units of phase).
