One of the types of objects in Praat. Ltas is short for Long-Term Average Spectrum.

An object of class Ltas represents the logarithmic power spectral density as a function of frequency, expressed in dB/Hz relative to 2·10-5 Pa.

Inside an Ltas object

With Inspect, you will see the following attributes:

the bottom of the frequency domain, in hertz. Usually 0.
the top of the frequency domain, in hertz.
the number of frequency bins (≥ 1).
the frequency step, or bin width, in hertz.
the frequency associated with the first bin, in hertz. Usually equals dx / 2, because the first bin tends to start at 0 hertz.
z1i, i = 1 ... nx
the power spectral density, expressed in dB.

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© Paul Boersma 2007-03-20