T/F grid selection example. The white dashed lines illustrate the borders of the time-frequency tiles superimposed on the spectrogram of the input signal. The leading edge and decay of the transient is encoded with short low frequency resolution envelopes, and the quasistationary passages in between transients are represented by longer high-frequency resolution envelopes.
den Brinker et al. EURASIP Journal on Audio, Speech, and Music Processing 2009 2009:468971 doi:10.1155/2009/468971