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音响降噪系统主要有两种类型:第一种为互补(或压扩)型,信号在录音前先经过编码,在重放时再进行解码。第二种为非互补型,它只在重放时发挥作用,不需要对信号预先编码。国外最常见的降噪系统杜比 B 属于互补型,能对高频提供5～10dB 的降噪效果;但还不甚令人满意,这促使其它设计者设计出各种能提供更大降噪效果的压扩型系统,如 dbx 系
There are two main types of acoustical noise reduction systems: the first is a complementary (or companding) type, the signal is encoded before being recorded and then decoded during playback. The second type is non-complementary, it only plays a role in replay, without the need to pre-encode the signal. The most common foreign noise reduction system Dolby B is a complementary type, can provide high-frequency 5 ~ 10dB noise reduction effect; but less satisfactory, prompting other designers to design a variety can provide greater noise reduction The effect of the compression type system, such as dbx Department