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COMPANDER stands for "Compressor-Expander." It represents a signal processing technique used in telecommunications, audio engineering, and various other fields to improve the dynamic range of analog signals while minimizing noise and distortion. The COMPANDER system comprises two main components: a compressor and an expander. The compressor reduces the dynamic range of the input signal by attenuating its amplitude during loud passages, effectively compressing the signal's dynamic range. This compression helps prevent overload and distortion in subsequent processing stages and transmission channels, allowing for more efficient use of bandwidth and reducing the impact of noise and interference. The expander then reverses the compression process, amplifying the attenuated signal during quieter passages to restore its original dynamic range and improve signal-to-noise ratio. By dynamically adjusting the gain of the input signal based on its amplitude, the COMPANDER system ensures that both soft and loud sounds are faithfully reproduced while minimizing the effects of noise and distortion. COMPANDER techniques are commonly used in audio recording and playback systems, telecommunication networks, radio broadcasting, and other applications where preserving signal quality and maximizing dynamic range are essential.