Wikipedia: Speech processing

The study of speech? signals and the processing methods of these signals. The signals are usually processed in a digital representation whereby speech processing can be seen as a subset of digital signal processing.

Speech processing can be divided in the following categories:

[Speech recognition]?, which deals with analysis of the linguistic content of a speech signal.
[Speaker recognition]?, where the aim is to recognise the identity of the speaker.
Enhancement of speech signals, e.g. [Noise reduction]?,
Speech coding for compression and transmission of speech. See also Telecommunication.
Voice analysis for medical purposes, such as analysis of vocal loading and dysfunction of the vocal cords.
The artificial synthesis? of speech, which usually means computer generated speech.