The primary background noise in audio recording, stemming from circuit noise in the amplifiers of the playback recorder or from residual magnetism on the tape. Several noise reduction methods are available, such as Dolby™, DNR (Dynamic Noise Reduction), DNL (Dynamic Noise Limiter), etc., to reduce the hiss while still retaining full signal bandwidth. In video transmission, \''hiss\'' or high frequency noise, may show as snow on the screen.
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