Discussion
What does a predictor contribute to a differential coder?
Answer: C
The predictor forms an estimate of the coming sample from the history, and only the difference between estimate and reality is transmitted - the better the prediction, the smaller that difference and the fewer bits it needs. An error record, a recovered clock and a companding law are all other things. The decoder runs the identical predictor, which is why both ends must agree on it exactly and why a bit error can take a moment to die away. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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