Definition of compander in US English:


(also compandor)


  • 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.

    • ‘So, until then, tune up your amplitude and frequency compandors, and explore that 2 meter band.’
    • ‘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.’
    • ‘When using both compression and the compander, set the compressor initially at 3 db and the compander at level 3.’
    • ‘A new type of compander in which the disadvantages of existing companders will be avoided has been designed.’
    • ‘Unfortunately, this is often a vain hope, and pre-emphasized digital companders usually give audible noise modulation on critical musical material.’
    • ‘The obvious advantages of out-of-band signaling are, of course, freedom from the effects of speech currents, compandors and echo suppressors.’
    • ‘The dual-band compandor should provide very good audio quality and the RF performance is decent.’
    • ‘The digital audio chain eliminates a compandor and its artifacts, and provides audio frequency response flat to 20 kHz.’
    • ‘In other words, the compandor can't cope with the abundant high-frequency transient information.’
    • ‘Because the information being transmitted is digitally encoded, useable dynamic range is much higher than a compandor can offer and there is no compandor in the audio signal to interfere with your measurements.’
    • ‘It can be seen that, for optimum results, a compander designed for magnetic studio recording will, at best, give a compromise in performance when used for photographic sound recording.’
    • ‘High quality companders are used in studios, audio workstations, and other professional environments.’
    • ‘The compand function supports two kinds of companders: law and A-law companders.’
    • ‘So I took the compander circuit of the Roland VP - 330, and adjusted time constants for an application where input- and output waveforms aren't similar anymore.’
    • ‘There are several plug-ins that take advantage of the 32-bit mode, and companders for those that don't.’
    • ‘The test tone activates all of the compandors and amplifiers on the line, simulating actual operating conditions.’
    • ‘Another variation is the compander (compressor/expander) which intentionally ‘flattens’ audio dynamic range for musical purposes.’


1930s: blend of compressor and expander (see expand).