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Motivation from lossless tubes

The transfer function of a lossless tube can be described by an all pole model. This is also a reasonable approximation to speech formed by the excitation of the vocal tract by glottal pulses (although the glottal pulses are not spectrally flat).

Figure 37: The lossless tube model of speech production


Nevertheless, with sufficient parameters the LP model can make a reasonable approximation to the spectral envelope for all speech sounds.

Speech Vision Robotics group/Tony Robinson