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Encyclopedia > Audio signal processing

Audio signal processing, sometimes referred to as audio processing, is the processing of a representation of auditory signals, or sound. The representation can be digital or analog. An analog representation is usually electrical; a voltage level represents the air pressure waveform of the sound. Similarly, a digital representation expresses the pressure wave-form as a sequence of symbols, usually binary numbers, which permits digital signal processing. Most generally, a representation is a performing of selected functions or roles of another physical or abstract object/person/organization in predefined circumstances and it is based on the consensus of the group/community involved. ... A schematic representation of hearing. ... In information theory, a signal is the sequence of states of a communications channel that encodes a message. ... A schematic representation of hearing. ... 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). ... An analog or analogue signal is any variable signal continuous in both time and amplitude. ... now. ... Air pressure can refer to the pressure of air environmentally, as in atmospheric pressure, or to the pressure of air in an inflatable or other sealed object, as might be read by a tire-pressure gauge. ... Waveform quite literally means the shape and form of a signal, such as a wave moving across the surface of water, or the vibration of a plucked string. ... The binary numeral system (base 2 numerals) represents numeric values using two symbols, typically 0 and 1. ... Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. ...

The focus in audio signal processing is most typically a mathematical analysis of which parts of the signal are audible. For example, a signal can be modified for different purposes such that the modification is controlled in the auditory domain. Which parts of the signal are heard and which are not, is not decided merely by physiology of the human hearing system, but very much by psychological properties. These properties are analysed within the field of psychoacoustics. Analysis is the generic name given to any branch of mathematics that depends upon the concepts of limits and convergence. ... Physiology (in Greek physis = nature and logos = word) is the study of the mechanical, physical, and biochemical functions of living organisms. ... Trinomial name Homo sapiens sapiens Linnaeus, 1758 Humans, or human beings, are bipedal primates belonging to the mammalian species Homo sapiens (Latin for wise man or knowing man) under the family Hominidae (the great apes). ... Hearing, or audition, is one of the traditional five senses, and refers to the ability to detect sound. ... Psychology (ancient Greek: psyche = soul and logos = word) is the study of mind, thought, and behaviour. ... Psychoacoustics is the study of subjective human perception of sounds. ...

Processing methods and application areas include storage, level compression, data compression, transmission, enhancement (e.g., equalization, filtering, noise cancellation, echo or reverb removal or addition, etc.) Audio storage refers to techniques and formats used to store audio with the goal to reproduce the audio later using audio signal processing to something that resembles the original. ... Audio level compression, also called dynamic range compression, compression, or limiting, is a process that manipulates the dynamic range of an audio signal. ... Audio compression is a form of data compression designed to reduce the size of audio data files. ... In communications, transmission is the act of transmitting electrical messages (and the associated phenonomena of radiant energy that pass through media). ... It has been suggested that this article or section be merged with Equalization filter. ... An audio filter is a type of filter used for processing sound signals. ... Active noise control (also known as noise cancellation or antinoise) is a method for preventing unwanted sound. ... Look up echo in Wiktionary, the free dictionary Echo may refer to: ECHO RULEZ THE KNOWN CB WORLD.. Echo (mythology), a nymph from Greek mythology. ... When sound is produced in an enclosed space multiple reflections build up and blend together creating reverberation or reverb. ...

Results from FactBites:

 Audio signal processing - Wikipedia, the free encyclopedia (206 words) Audio signal processing, sometimes referred to as audio processing, is the processing of a representation of auditory signals, or sound. The focus in audio signal processing is most typically a mathematical analysis of which parts of the signal are audible. Which parts of the signal are heard and which are not, is not decided merely by physiology of the human hearing system, but very much by psychological properties.
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