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:
- xmin
- start time, in seconds.
- xmax
- end time, in seconds.
- nx
- the number of frames (≥ 1).
- dx
- time step = frame length = frame duration, in seconds.
- x1
- 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:
- intensity
- an indication of the maximum intensity (a squared sound amplitude) in this frame.
- nFormants
- 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:
- frequency
- the formant's centre frequency (in Hz).
- bandwidth
- the formant's bandwidth (in Hz).
See also
Linear Prediction
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