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What (who) is Spectral Band Replication - definition
![trimer]] of the protein [[PCNA]].](https://commons.wikimedia.org/wiki/Special:FilePath/1axc tricolor.png?width=200 "trimer]] of the protein [[PCNA]].")
![element]] and the detailed structures of two [[base pair]]s are shown in the bottom right.](https://commons.wikimedia.org/wiki/Special:FilePath/DNA Structure+Key+Labelled.pn NoBB.png?width=200 "element]] and the detailed structures of two [[base pair]]s are shown in the bottom right.")
![Scheme of the replication fork.<br />a: template, b: leading strand, c: lagging strand, d: replication fork, e: primer, f: [[Okazaki fragments]]](https://commons.wikimedia.org/wiki/Special:FilePath/Replication fork.svg?width=200 "Scheme of the replication fork.<br />a: template, b: leading strand, c: lagging strand, d: replication fork, e: primer, f: [[Okazaki fragments]]")
Wikipedia
Spectral band replication (SBR) is a technology to enhance audio or speech codecs, especially at low bit rates and is based on harmonic redundancy in the frequency domain.
It can be combined with any audio compression codec: the codec itself transmits the lower and midfrequencies of the spectrum, while SBR replicates higher frequency content by transposing up harmonics from the lower and midfrequencies at the decoder. Some guidance information for reconstruction of the high-frequency spectral envelope is transmitted as side information.
When needed, it also reconstructs or adaptively mixes in noise-like information in selected frequency bands in order to faithfully replicate signals that originally contained no or fewer tonal components.
The SBR idea is based on the principle that the psychoacoustic part of the human brain tends to analyse higher frequencies with less accuracy; thus harmonic phenomena associated with the spectral band replication process needs only be accurate in a perceptual sense and not technically or mathematically exact.
