I have audio and its spectrogram of the words in English language. (A spectrogram is a frequency domain representation of a signal) Consider the words: chain, change, chair, chapter. As you can notice, the 'ch' sound is common among the words considered.
Is there an algorithm that will allow me to identify which part of the spectrogram (data) is common between the spectrograms of the words? In other words, is there an algorithm that can identify the part of the spectrogram that represents 'ch' sound in each of the words?