Spectral Band Replication - Definition and Overview

Spectral Band Replication or SBR is a technology to enhance audio or speech codecs especially at low bitrates.

It can be combined with any audio compression codec: the codec transmits the lower frequencies of the spectrum and SBR reconstructs the higher frequencies based on the lower frequencies and transmitted side information.

It is already combined with AAC to create MPEG-4 High Efficiency AAC (HE AAC), with MP3 to create Mp3PRO and with MPEG-2. It is used in broadcast systems like DRM and XM Satellite Radio.

See Also

• Perceptual Audio Coding

External Link

• SBR Explained - Coding technologies (http://www.codingtechnologies.com/products/sbr.htm)
• Afterdawn explanation (http://www.afterdawn.com/glossary/terms/sbr.cfm)
• AudioCoding.com SBR explanation (http://www.audiocoding.com/modules/wiki/?page=SBR)