Spectrogram

Relationship of column of spectrogram to original signal

Relationship of column of spectrogram to original signal
  1. What is the relationship between a spectrogram and Fourier transform?
  2. What is spectrogram of a signal?
  3. What is spectrogram and how it is computed?

What is the relationship between a spectrogram and Fourier transform?

To generate a spectrogram, a time-domain signal is divided into shorter segments of equal length. Then, the fast Fourier transform (FFT) is applied to each segment. The spectrogram is a plot of the spectrum on each segment.

What is spectrogram of a signal?

A spectrogram is a visual way of representing the signal strength, or “loudness”, of a signal over time at various frequencies present in a particular waveform. Not only can one see whether there is more or less energy at, for example, 2 Hz vs 10 Hz, but one can also see how energy levels vary over time.

What is spectrogram and how it is computed?

The spectrogram is a three-dimensional plot of signal amplitude versus time and frequency. It is typically computed using the Short Time Fast Fourier Transform (STFT). — Click for http://en.wikipedia.org/wiki/Spectrogram.

Spectral Possible spectral leakage
Possible spectral leakage
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Average Why are moving average filters and integrators considered low pass filters?
Why are moving average filters and integrators considered low pass filters?
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Sampling How does the quadrature sampling lower the sampling rate?
How does the quadrature sampling lower the sampling rate?
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