Transient models

• Original waveform slice
• Wavelet expansion [7]
• MPEG-2 AAC (with short window) [132]
• Frequency-domain LPC (time-domain amplitude envelope) [266]

A transient detector can be used to indicate the frame-times for which the peak phases should be retained. Examples:

• Differentiated amplitude envelope of high-passed time-domain signal, perhaps normalized by maximum amplitude, and compared to a threshold.
• Linear prediction error [132].