A deprecated type of object in PRAAT. It is replaced by Spectrogram.
An object of type FormantFilter represents an acoustic time-frequency representation of a sound: the power spectral density P(f, t), expressed in dB as 10*log10(power/4e-10)). In the now preferred Spectrogram the power is represented instead of its dB value. It is sampled into a number of points around equally spaced times ti and frequencies fj (on a linear frequency scale).
With Inspect you will see that this type contains the same attributes a Matrix.
© djmw, October 22, 2014