Information in Continuous Signals

We are now in a position to consider the information content of much more general signals than we discussed in chapters 1–5. We restricted our attention there to discrete signals, such as letters of the alphabet or streams of binary digits. However, many practical signals are essentially analogue (that is, continuous) in practice, such as a speech signal from a microphone or a radio signal (although they are often digitised later for processing by computer), and we need to be able to deduce their information capacity.