What is the Pitch of an audio signal
Pitch can be described as the dominating frequency of a wave in a given period which is where most of the energy lies. It is also defined as the fundamental frequency of a signal.
Estimating the pitch
There are several methods that can be used for pitch estimation, including:
Autocorrelation method
Cepstral analysis
Harmonic product spectrogram
Pitch period histogram
Probabilistic models such as the pitch filter or pitch-synchronous overlap-add (PSOLA)
Machine learning based methods such as deep neural network (DNN) and convolutional neural network (CNN) recent methods based on transform domain such as wavelet, STFT or cepstral analysis.
It is important to note that the choice of method depends on the specific application and the characteristics of the audio signal being analyzed.