Speech processing is the study of speech signals and the processing methods of these signals. Look up Speech in Wiktionary, the free dictionary. ... In information theory, a signal is the sequence of states of a communications channel that encodes a message. ...

The signals are usually processed in a digital representation whereby speech processing can be seen as the intersection of digital signal processing and natural language processing. A digital system is one that uses discrete numbers, especially binary numbers, or non-numeric symbols such as letters or icons, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (an analog system). ... Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. ... Natural language processing (NLP) is a subfield of artificial intelligence and linguistics. ...

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.
• Speech synthesis: the artificial synthesis of speech, which usually means computer generated speech.
• Speech compression is important in the telecommunications area for increasing the amount of info which can be transferred, stored, or heard, for a given set of time and space constraints.

Speech recognition (in many contexts also known as automatic speech recognition, computer speech recognition or erroneously as Voice Recognition) is the process of converting a speech signal to a sequence of words, by means of an algorithm implemented as a computer program. ... Linguistics is the scientific study of language. ... Speaker recognition, or voice recognition is the task of recognizing people from their voices. ... In philosophy, the issue of personal identity concerns the conditions under which a person at one time is the same person at another time. ... Noise reduction is the process of removing noise from a signal. ... Speech coding is the compression of speech (into a code) for transmission with speech codecs that use audio signal processing and speech processing techniques. ... In computer science and information theory, data compression or source coding is the process of encoding information using fewer bits (or other information-bearing units) than an unencoded representation would use through use of specific encoding schemes. ... Copy of the original phone of Graham Bell at the Musée des Arts et Métiers in Paris Telecommunication is the transmission of signals over a distance for the purpose of communication. ... Voice analysis is the study of speech sounds for purposes other than linguistic content, such as in speech recognition. ... Vocal loading is the stress inflicted on the speech organs when speaking for long periods. ... Laryngoscopic view of the vocal folds. ... Speech synthesis is the artificial production of human speech. ... Speech coding is the compression of speech (into a code) for transmission with speech codecs that use audio signal processing and speech processing techniques. ...

Books

• Multilingual Speech Processing, Edited by Tanja Schultz and Katrin Kirchhoff, April 2006

See also

• Audio signal processing
• Linguistics
• Phonetics
• Utterance
• Speech signal processing

This article or section does not cite its references or sources. ... Linguistics is the scientific study of language. ... Phonetics (from the Greek word φωνή, phone meaning sound, voice) is the study of sounds and the human voice. ... An utterance is a complete unit of talk, bounded by silence. ... Speech signal processing refers to the acquisition, manipulation, storage, transfer and output of human utterances by a computer. ...

External links

• Compure Audio Technologies
• Center for Language and Speech Processing at JHU
• Speech Processing Group
• Voyce Security Systems
• Speech Processing Group at the Laboratory of Applied Physics
• Speech and Language Processing
• Speech Processing
• Speech Processing Discussion Group
• Philips Speech Recognition Systems