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    • English
      • Telecom(munications)
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          • Term
            • compander
          • Additional fields of expertise
          • Definition(s)
            • 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. Maxim Integrated Products, Dallas Semic.
          • Example sentence(s)
            • This compander covers a frequency domain from 20Hz to 20KHz, the total distortions are below 1% and the signal/noise ratio is 80dB. - electroschematics.com by
            • Unlike traditional companders that have increasing amounts of signal distortion as the frequency becomes lower, the Syfx compander has no signal distortion at any frequency. - syfx by
            • We tested transmissions with two companders (DSKs) on 40 meter SSB using three ham radios to compare co-channel interference and signal quality. The third radio was used for creating an interference signal. The compander definitely helped to lessen the co-channel interference from this interfering signal transmitting at the same signal strength. - people.wallawalla.edu by
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    • French
      • Telecom(munications)
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          • Term
            • compresseur-extenseur
          • Additional fields of expertise
          • Definition(s)
            • Dispositif employé sur certaines voies téléphoniques, qui améliore la qualité de la transmission. Le signal est comprimé à l'entrée d'un circuit à longue distance, puis restitué dans sa forme originale à la sortie du circuit. Ensemble constitué par un compresseur, situé en un point d'une voie de transmission, suivi d'un extenseur situé en un autre point. C'est l'ensemble d'un compresseur, situé en un point d'une voie de transmission et destiné à réduire l'intervalle de variation du volume des signaux, suivi d'un extenseur situé en un autre point et destiné à rétablir l'intervalle de variation du volume tel qu'il était à l'origine. Grand dictionnaire terminologique - by Fabien Champême
          • Example sentence(s)
            • Au sein d'un système analogique sans fil classique, le compander (ou compresseur-extenseur) est l'élément central pour la transmission avec une large bande dynamique. - Sony by Fabien Champême
            • Le bon fonctionnement d'un compresseur-extenseur exige un court temps d'amortissement afin d'éviter des bruits audibles après la fin abrupte d'un signal utile. - Brevet européen no 68.185 by Fabien Champême
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