Spectrogram

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A spectrogram is a visual representation of how the frequency content of a signal changes over time. Time is normally shown on the horizontal axis, frequency on the vertical axis, and colour or brightness represents amplitude or power.

Spectrograms are commonly calculated by dividing a signal into overlapping time windows and applying a Fourier transform to each segment. This procedure is known as the short-time Fourier transform.

The choice of window length creates a trade-off between time and frequency resolution. Short windows locate rapid events more accurately, while long windows distinguish nearby frequencies more clearly.

Spectrograms are widely used for speech, music, animal calls, machinery, radar, sonar, seismology, astronomy, and biomedical signals.

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• Source / publisher: Wikipedia
• URL type: WWW
• Credits: Wikipedia
• URL: https://en.wikipedia.org/wiki/Spectrogram