The representation of spectral envelopes is the pivoting point of the project. As we have seen in the previous chapter, the various estimation methods result in very different parameterizations of spectral envelope s. However, the choice of one canonical representation is essential for the flexibility of further processing.
Also, the choice of a good canonical representation of spectral envelopes is crucial for their applicability to a specific task. The ability to manipulate them in a useful and easy way, and the speed of synthesis depend heavily on the representation. Specifically, the requirements of locality, flexibility, speed of synthesis, and space will be laid out in section 4.1. Theu will then be tested with the different possible representations in the subsequent sections 4.2-4.6. Finally, section 4.7 will give a summary of the qualities of the examined methods, and present the representation which was chosen.