Pitch detection

A spectrogram is a visual representation of the spectrum of frequencies of a signal as it varies with time. When applied to an audio signal, spectrograms are sometimes called sonographs, voiceprints, or voicegrams. [1]

See: demo

Autocorrelation, sometimes known as serial correlation in the discrete time case, measures the correlation of a signal with a delayed copy of itself. ... Autocorrelation is widely used in signal processing, time domain and time series analysis to understand the behavior of data over time. [2]

See: demo

Reference

1. Wikipedia contributors. Spectrogram. In: Wikipedia: The Free Encyclopedia [Internet]. FL: Wikimedia Foundation, Inc. [revised 2024 Dec 9, 07:43 UTC; cited 2025 Feb 23]. Available from: https://en.wikipedia.org/w/index.php?title=Spectrogram&oldid=1262037486
2. Wikipedia contributors. Autocorrelation. In: Wikipedia: The Free Encyclopedia [Internet]. FL: Wikimedia Foundation, Inc. [revised 2025 Feb 17, 17:06 UTC; cited 2025 Feb 23]. Available from: https://en.wikipedia.org/w/index.php?title=Autocorrelation&oldid=1276227047