1. The audio processing equipment mainly adopts the method of reducing the dynamic range to suppress the noise, including program signal compression, peak limit and clipping, multi-band compression, frequency selectable limitation and equalization, etc. 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 as uniform as possible. Peak limit is a type of compression and its form, but it has a higher compression ratio and faster boot and recovery times. The main purpose is to protect the transmission of the following channels from overload.
2. The peak shaving process is to prevent distortion caused by overload of the channel processing circuit, and instantly "cut off" the high-level peak part that exceeds the threshold. If peak limiting and clipping are well matched, it will be able to handle harmonic distortion and intermodulation distortion between the density and loudness of the audio program signal, as well as the negative effects of signal bandwidth.
