Spectrogram of this recording of a violin playing. Note the harmonics occurring at whole-number multiples of the fundamental frequency. SBR exploits this redundancy.
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.[1] 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.
^
Novak, Clark. "Spectral Band Replication and aacPlus Coding - An Overview" (PDF). Archived from the original (PDF) on November 30, 2010. Retrieved February 8, 2010.
and 25 Related for: Spectral band replication information
refer to: Sequencing batch reactor, for wastewater treatment Spectralbandreplication, to enhance audio codecs Shooting and bouncing rays, in computational...
compression codec that combines the MP3 audio format with the spectralbandreplication (SBR) compression method. At the time it was developed it could...
and SpectralBandReplication (SBR) are two of many examples of bandwidth extension algorithms currently in use. In these methods, the low band of the...
owned by Beijing E-World, that uses a unique perceptual model, spectralbandreplication, to compress the audio signal by utilizing the redundancy as well...
a broad range of bitrates. Enhanced variations of the MPEG-4 SpectralBandReplication (SBR) and MPEG-D MPEG Surround parametric coding tools are integrated...
successor of a prior design known as EAC and works on the basis of spectralbandreplication. EAC 2.0 supports mono, stereo and 5.1 surround sound. The original...
AB was a Swedish technology company that pioneered the use of spectralbandreplication in Advanced Audio Coding. It is a major provider of audio compression...
technique known as band folding, which delivers a similar effect to spectralbandreplication (SBR) by reusing coefficients of lower bands for higher ones...
developing a new method of compressing digital audio files called SpectralBandReplication (SBR). This concept, which was produced into a real-world application...
a fluorescence microscope using up to 7 narrow-banded fluorescence filters or, in the case of spectral karyotyping, by using an interferometer attached...
Boston. The capacity of a 30 kHz channel on the AM band is limited. By using spectralbandreplication the HDC+SBR codec is able to simulate the recreation...
favor with most commercial music distributors. The addition of SpectralBandReplication (AACplus or HE-AAC) allows the format to recreate high-frequency...
processors that are optimized for the aacPlus codec, including spectralbandreplication (SBR). Audio was stored digitally in Dalet audio library systems...
Wiegand (Fraunhofer) 2013 for the development and marketing of spectralbandreplication at Coding Technologies (now part of Dolby Laboratories) Lars Liljeryd...
types of spectral imagers. There are push broom scanners and the related whisk broom scanners (spatial scanning), which read images over time, band sequential...
"NRG→RGB" mapping is used, with "N" being the near-infrared spectralband (and the blue spectralband being unused) – this yields the typical "vegetation in...
system is based on MPEG-4 HE-AAC v2, that is it includes de SBR (spectralbandreplication) and PS (parametric stereo) tools. Note that, in the High efficiency...
Geological Survey (USGS) "EarthExplorer" website. Landsat 7 data has eight spectralbands with spatial resolutions ranging from 15 to 60 m (49 to 197 ft); the...
MDCT, in MPEG-4 AAC-SSR for the 4 band PQF bank, in MPEG-4 V3 SBR for the analysis of the upper spectralreplicatedband, and in DTS. PQF has an advantage...
materials of interest have unique spectral "fingerprints" in the terahertz range. This offers the possibility to combine spectral identification with imaging...
propagate through nitrogen. Scientific instruments can, therefore, use this spectral range by operating in an oxygen-free atmosphere (commonly pure nitrogen)...
Global Information