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Super Bit Mapping (SBM) is a noise shaping process, developed by Sony for CD mastering.^[1]

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.^[2]

Audible quantization error is reduced by noise shaping the error according to an equal-loudness contour.^[3]

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.

• Extended Resolution Compact Disc (XRCD)
• High Definition Compatible Digital (HDCD)