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Parametric Coding for High-Quality Audio

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Compared to the traditional wave form coding standards employing subband or transform coding, parametric coding is regarded as a technique that allows even further reduction of bit-rates. An example of this is the MPEG-4 V2 HILN parametric coder. This coder is targeting medium quality at very low bit-rates. This level of quality was expected to be typical for parametric coders. In response to a call for proposals by MPEG, Philips has submitted a parametric coder targeting a significantly higher quality level. Currently, this coder is further improved as a collaborative development in the course of the "MPEG-4 Extension I" standardization process

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AES - Audio Engineering Society