Static non-complementary noise reducer: only one-time processing of noise. The working state of the machine is fixed.
Dynamic non-complementary noise reducer: unidirectional processing according to different input signals.
Static complementary noise reduction: before recording, before entering the tape recording, first raise the high frequency part to reach a certain gain, and then record it on the tape. Use a complementary method to reduce the high frequency gain and restore it to the normal state during playback. Reduce the high frequency noise introduced by the tape.
Dynamic complementary noise reducer: according to the different input of the signal input size, first compress and then expand, so that the signal returns to normal and the noise is suppressed. For example, a combination of a compressor and an expander to form a compander is a type of such machine. The Dolby noise reduction system is a companded type.
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