In a Dither for Reader and Speech Recognition Software, 2009.
The fundamental problem of communication is that of reproducing at one point either exactly or approximately a message selected at another point. Frequently the messages have meaning; that is they refer to or are correlated according to some system with certain physical or conceptual entities. These semantic aspects of communication are irrelevant to the engineering problem. The significant aspect is that the actual message is one selected from a set of possible messages. The system must be designed to operate for each possible selection, not just the one which will actually be chosen since this is unknown at the time of design. If the number of messages in the set is finite then this number or any monotonic function of this number can be regarded as a measure of the information produced when one message is chosen from the set, all choices being equally likely.
-- Claude Shannon A Mathematical Theory of Communication, 1948
The above was recorded at the time of performance; i.e., it is simultaneous with the procedure of dictation, machine transcription, and reading of the output text (ad nauseam).