Howtosignalprocessing
- Why frequency domain is better than the time domain for signal analysis?
- What is difference between time domain and frequency domain?
- How are instantaneous phase and frequency related?
- Why is FFT mirrored?
Why frequency domain is better than the time domain for signal analysis?
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.
What is difference between time domain and frequency domain?
Put simply, a time-domain graph shows how a signal changes over time, whereas a frequency-domain graph shows how much of the signal lies within each given frequency band over a range of frequencies.
How are instantaneous phase and frequency related?
1 Instantaneous magnitude and phase. holds for a sinusoidal function. The angular frequency ω or for the frequency creates the sensation of pitch by hearing the sound of the wave. The pitch goes higher as the frequency increases; the sensation of pitch is in proportion to the frequency on the logarithmic scale.
Why is FFT mirrored?
Because both the positive and negative frequency sinusoids are 90 degrees out of phase and have the same magnitude, they will both respond to real signals in the same way.
