Audio processing equipment primarily suppresses noise by means of reduced dynamic range, including compression of program signals, peak limiting and clipping, multi-band compression and frequency selective limiting and equalization. The main purpose of compression is to reduce the dynamic range of the program, increase the density of the sound, and try to make the peak amplitude of the audio signal uniform. The peak limit is an extreme form of compression, but it has a high compression ratio and a fast start-up and recovery time. The main purpose is to protect the transmission of the rear channel from over-loading.
The peak clipping process is a process of preventing the distortion caused by the overload of the channel processing circuit and instantaneously "cutting off" the high-level peak portion exceeding the threshold. Peak matching and clipping, if perfectly matched, will handle harmonic distortion and intermodulation distortion and the negative effects of signal bandwidth between the density and loudness of the audio program signal.
The audio spectrum is divided into several frequency bands during audio processing, and each frequency band is separately compressed and limited. That is, "multi-band compression and selectable limits", if the settings are correct and reasonable, will effectively eliminate the intermodulation of spectral gain. For equalization in audio processing, the effect is to use an equalizer to change the balance of the relevant frequency in the overall frequency band of the audio signal, and on the other hand to create an acoustic feature by changing the loudness of the "sensitive frequency" to increase the program. It can also be used as a frequency response correction in transmission systems.
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