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Entries found for search: linear

linear : (1) A system is said to be linear if it meets the conditions of proportionality and additivity: if its output level changes smoothly in proportion to input level changes, and if input x causes output X and input y causes output Y, then x + y at the input must cause X + Y at the output. Most tests in audio including frequency response, gain, phase, impulse response, etc. assume linearity. (2) Uncompressed, i.e., an audio file that has not been processed by some kind of compression algorithm, such as ADPCM. (3) A process which works in a sequential fashion, such as magnetic tape recording, playback the or editing tape media, etc., as opposed to a sequence of steps which can be taken in any order and/or in any location, such as the random-access editing and playback processes which are made possible by digital storage technology.

linear distortion : Any type of distortion that a linear system is capable of producing, as opposed to nonlinear distortion. Some types of linear distortion are frequency response errors and time-delay errors such as phase-shift.

phase linear : The ability of an audio device to pass a signal without causing phase-shift.

nonlinear distortion Linearity would predict an invariant ratio of gain to input voltage in an audio device such as an amplifier. Manifested as harmonic distortion and intermodulation distortion, there is a point at which the amplifier gain is reduced as the input gain is increased. This is the nonlinear region of the amplifier. All audio devices have local peculiarities or deviations from linearity at specific signal levels. See also distortion, linear distortion.

nonlinear recording Use of a recording medium which is random access, i.e., not recorded to conventional tape. Digital recording systems allow for playback in any order, while linear systems require that playback occur in the order in which the material was recorded.

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