Frequency Domain - Meaning [duplicate]

1. What does the frequency domain tell you?
2. How do you interpret a frequency domain graph?
3. What is the difference between spatial domain and frequency domain?
4. What is frequency domain representation of sampling?
5. What is frequency domain aliasing?
6. What is frequency domain system?

What does the frequency domain tell you?

The frequency domain representation of a signal allows you to observe several characteristics of the signal that are either not easy to see, or not visible at all when you look at the signal in the time domain. For instance, frequency-domain analysis becomes useful when you are looking for cyclic behavior of a signal.

How do you interpret a frequency domain graph?

Frequency domain graphs

Frequency is plotted along the x-axis and amplitude is plotted along the y-axis. FFTs often look like a series of mountain peaks. The horizontal location of peaks indications which frequencies are strongly present in the sound. The valleys show which frequencies are absent.

What is the difference between spatial domain and frequency domain?

Difference between spatial domain and frequency domain

In spatial domain, we deal with images as it is. The value of the pixels of the image change with respect to scene. Whereas in frequency domain, we deal with the rate at which the pixel values are changing in spatial domain.

What is frequency domain representation of sampling?

In the frequency domain, sampling of the original signal is described as the convolution of the original signal with a comb function (with peaks repeating at the sampling frequency).

What is frequency domain aliasing?

Aliasing is the effect of new frequencies appearing in the sampled signal after reconstruction, that were not present in the original signal. It is caused by too low sample rate for sampling a particular signal or too high frequencies present in the signal for a particular sample rate.

What is frequency domain system?

In physics, electronics, control systems engineering, and statistics, the frequency domain refers to the analysis of mathematical functions or signals with respect to frequency, rather than time.