Chapter 18 – Analysis/Synthesis and Analysis by Synthesis Schemes

Analysis/synthesis schemes rely on the availability of a parametric model of the source output generation. When such a model exists, the transmitter analyzes the source output and extracts the model parameters, which are transmitted to the receiver. The receiver uses the model along with the transmitted parameters to synthesize an approximation to the source output. The difference between this approach and the techniques we have looked at in previous chapters is that what is transmitted is not a direct representation of the samples of the source output; instead, the transmitter informs the receiver how to go about regenerating those outputs. For this approach to work, a good model for the source has to be available. Since good models for speech production exist, this approach has been widely used for the low-rate coding of speech. We describe several different analysis/synthesis techniques for speech compression. In recent years the fractal approach to image compression has been gaining in popularity. Because this approach is also one in which the receiver regenerates the source output using “instructions” from the transmitter, we describe it in this chapter.

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