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Definition of "Compander" |
Signal processing technique which uses both compression and expansion to improve dynamic range and signal-to-noise ratio. A signal is passed through a non-linear transformation prior to transmission. A reverse of this transformation occurs at reception. The transformation is such that quiet portions are boosted and loud portions reduced. Noise is reduced because the quiet signals are louder, compared to the noise in the transmission channel. Used in digital, PCM, transmissions as well as analog applications. Dolby is a common example of a compander-based noise reduction system. / An acronym for COMpressor-exPANDER. A circuit that compresses and then expands the signal in amplitude. Normally a circuit compresses the signal [level] at one end of an interface than expanding the signal at the far end. / A device that improves the signal-to-noise ratio of an electrical signal by compressing the range of amplitudes of the signal before transmission, and then expanding it on reproduction or reception. / a point operation that logarithmically compresses a sample into fewer bits before transmission. The inverse logarithmic function is used to expand the code to its original number of bits before converting it into an analog signal. Typically used in telecommunications systems to minimize bandwidth without degrading low-amplitude signals. |
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