Waveform
Spectrogram (Time-Frequency)
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See how frequency content changes over time
X-axis: Time - the horizontal position shows when a frequency occurs
Y-axis: Frequency - the vertical position shows which frequencies are present
Color: Intensity - brighter colors indicate stronger energy at that time-frequency point
Trade-off: Larger window = better frequency resolution but poorer time resolution. Smaller window = opposite. This is Heisenberg's uncertainty principle in action!