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Noise Reduction

From Chace Audio

Noise reduction refers to any process designed to separate and remove unwanted audio information from program material. There are two main approaches to noise reduction.

The first type of noise reduction employs an encode/decode scheme, such as Dolby® A, Dolby® SR, or DBX. In this approach, program material is pre-emphasized during recording and de-emphasized during playback. The playback de-emphasis returns the program material to its original state (EQ, level, and dynamic range), while simultaneously reducing the inherent noise of the medium (usually film or tape).

The second type of noise reduction is a single-ended process that occurs during playback when no encoding or pre-emphasis has occurred. Single-ended noise reduction employs filters and dynamic processing and is often used to reduce noise inherent in the original program material (such as wind or other environmental noises), as well as the inherent noise of the medium. The advantage to a single-ended process is that it can be applied to older, legacy material that did not have the benefit of modern Dolby noise reduction.