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Super Bit Mapping
Super Bit Mapping (SBM) is a noise shaping process, developed by Sony for CD mastering.
Sony claims that the Super Bit Mapping process converts a 20-bit signal from master recording into a 16-bit signal nearly without sound quality loss, using noise shaping to improve signal to noise ratio over the frequency bands most acutely perceived by human hearing.〔(【引用サイトリンク】url=http://pdf.textfiles.com/manuals/STARINMANUALS/Sony%20Audio/Manuals/White%20Paper%20-%20Super%20Bit%20Mapping.pdf )〕
Audible quantization error is reduced by noise shaping the error according to an equal-loudness contour.
This processing takes place in dedicated hardware inside the recording device. A similar process is used in Sony's DSD to PCM conversion and is called SBM Direct.
==See also==
* Extended Resolution Compact Disc
* K2 High Definition
* High Definition Compatible Digital
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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