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A composite word from compressing and expanding. An analogue technique for improving the signal to noise ratio of a transmission system. The audio dynamic range is compressed before transmission, by increasing the low level signals, usually using a 2:1 logarithmic law (60 dB dynamic range reduced to 30 dB). The complementary process of expansion is carried out on the demodulated signal in the receiver.

Source: ERC REPORT 42 [1.006 KB]