Spectrum

Position of spike in the spectrum of a sin wave

Position of spike in the spectrum of a sin wave
  1. What do the spikes in a frequency spectrum represent?
  2. What is the spectrum of sinusoidal signal?
  3. What do peaks in FFT mean?
  4. How does windowing the truncated sine wave improve the DFT spectrum?

What do the spikes in a frequency spectrum represent?

As a result, the FFT of a pure tone is a single vertical “spike” or “peak.” The location of the spike along the horizontal (frequency) axis indicates the frequency. The height of the spike gives the amplitude.

What is the spectrum of sinusoidal signal?

These sinusoidal components have different frequencies, different amplitudes, and different phases. Therefore, the plots of frequency versus amplitude and phase for the sinusoidal components which comprise the signal are called the Frequency Spectrum or Spectrum of the signal.

What do peaks in FFT mean?

The peaks are the frequencies at which the vibration amplitude is maximal. Here, they appear to be at about 900 Hz, and about 1200-1300 Hz.

How does windowing the truncated sine wave improve the DFT spectrum?

Applying a window minimizes the effect of spectral leakage. lobe response of a strong sinusoidal signal can overpower the main lobe response of a nearby weak sinusoidal signal. Typically, lower side lobes reduce leakage in the measured FFT but increase the bandwidth of the major lobe.

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