Super Bit Mapping
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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.
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.
- Maes, Jan; Vercammen, Marc; Baert, Luc (2001). Digital audio technology: a guide to CD, MiniDisc, SACD, DVD(A), MP3 and DAT (4th ed.). Focal Press. pp. 60–63. ISBN 978-0-240-51654-7.
- "Super Bit Mapping Technical Overview" (PDF). Sony. Retrieved 15 January 2013.
- US 5204677, "Quantizing error reducer for audio signal"
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