单词	compander
释义	compander /kəmˈpandə / (also compandor) noun 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.To ensure noise measurements on digital carriers (PCM systems) are valid, a holding tone must be transmitted to operate the compander and quantizing circuitry in its normal operating range.... High quality companders are used in studios, audio workstations, and other professional environments. There are several plug-ins that take advantage of the 32-bit mode, and companders for those that don't. Origin 1930s: blend of compressor and expander (see expand).
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