STFT frequency bin

A Short-Time Fourier Transform (STFT) frequency bin refers to the frequency resolution of the STFT output. The STFT is a time-frequency analysis technique that divides a signal into short overlapping windows and computes the Fourier Transform of each window. The result is a spectrogram that displays the frequency content of the signal over time.

The frequency resolution of the STFT is determined by the length of the analysis window and the sampling rate of the signal. Each frequency bin in the STFT represents a specific frequency range and is typically expressed in Hertz (Hz). For example, if the sampling rate is 44100 Hz and the analysis window is 1024 samples, each frequency bin would cover a range of 21.5 Hz. Therefore, the nth frequency bin of the STFT output represents the frequency range from (n-1) times the frequency bin width to n times the frequency bin width.