One of the types of objects in Praat. A Formant object represents spectral structure as a function of time: a formant contour. Unlike the time-stamped FormantGrid object, it is sampled into a number of frames centred around equally spaced times, Each frame contains frequency and bandwidth information about several formants.

Inside a Formant object

With Inspect, you will see the following attributes:

start time, in seconds.
end time, in seconds.
the number of frames (≥ 1).
time step = frame length = frame duration, in seconds.
the time associated with the first frame, in seconds. This will usually be in the range [xmin, xmax]. The time associated with the last frame (i.e., x1 + (nx – 1) dx)) will also usually be in that range.
framei, i = 1 ... nx
the frames (see below).

Attributes of a formant frame

Each framei contains the following attributes:

an indication of the maximum intensity (a squared sound amplitude) in this frame.
the number of formants in this frame (usually between 2 and 6).
formantj, j = 1 ... nFormants
the information about each formant (see below).

Attributes of each formant

Each formantj contains the following attributes:

the formant's centre frequency (in Hz).
the formant's bandwidth (in Hz).

See also

Linear Prediction

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© ppgb, April 27, 2005