How to calculate Long Term Average Spectrum of an audio file?

1. How do you calculate long-term average spectrum?
2. What is a long-term spectral average?

How do you calculate long-term average spectrum?

S = LTAS(X,FS) calculates the long-term average spectrum (LTAS) of signal X, sampled at FS Hz. The spectrum is calculated from the average power spectral density (PSD) obtained from a series of overlapping FFTs; the FFT length is 4096, and the hop size is 2048. The segments of X are Hann-windowed.

What is a long-term spectral average?

The Long-Term Average Spectrum (LTAS) is a fast Fourier transform-generated power spectrum of the frequencies comprising a speech sample. Thus, the LTAS is a composite signal representing the spectrum of the glottal source as well as the spectrum or resonant characteristics of the vocal tract.