Spectral Band Replication
E818775
Spectral Band Replication is an audio coding enhancement technique that reconstructs high-frequency components from lower-frequency data to improve compression efficiency at low bitrates.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
audio coding enhancement technique
ⓘ
perceptual audio coding tool ⓘ |
| abbreviation | SBR ⓘ |
| alsoKnownAs | bandwidth extension tool ⓘ |
| appliesTo | perceptual audio codecs ⓘ |
| backwardCompatibleWith | AAC decoders that ignore SBR data (with reduced bandwidth) ⓘ |
| basedOn |
psychoacoustic principles
ⓘ
spectral domain processing ⓘ |
| componentOf |
HE-AAC (High Efficiency Advanced Audio Coding)
NERFINISHED
ⓘ
HE-AAC v1 NERFINISHED ⓘ HE-AAC v2 NERFINISHED ⓘ |
| developedBy | Coding Technologies NERFINISHED ⓘ |
| domain |
audio coding
ⓘ
audio signal processing ⓘ |
| hasAdvantage | better quality at a given low bitrate compared to core codec alone ⓘ |
| hasKeyIdea |
reconstructing high-frequency bands from low-frequency bands at the decoder
ⓘ
transmitting low-frequency content and side information instead of full high-frequency data ⓘ |
| hasTradeoff |
increased decoder complexity
ⓘ
possible artifacts in reconstructed high frequencies ⓘ |
| improves |
coding efficiency at low bitrates
ⓘ
subjective audio quality at low bitrates ⓘ |
| influenced | later bandwidth extension techniques in audio coding ⓘ |
| introducedIn | early 2000s ⓘ |
| laterOwnedBy | Dolby Laboratories NERFINISHED ⓘ |
| operatesOn | frequency-domain representation of audio ⓘ |
| reduces | bitrate required for wideband audio ⓘ |
| relatedTo |
AAC (Advanced Audio Coding)
NERFINISHED
ⓘ
MPEG audio coding NERFINISHED ⓘ parametric stereo ⓘ |
| requires | SBR-aware decoder for full benefit ⓘ |
| standardizedIn |
MPEG-4 AAC family
NERFINISHED
ⓘ
MPEG-4 HE-AAC v1 NERFINISHED ⓘ MPEG-4 HE-AAC v2 NERFINISHED ⓘ MPEG-4 High Efficiency AAC NERFINISHED ⓘ |
| targetBitrateRange | very low to low bitrate audio coding ⓘ |
| typicalUseCase |
digital broadcasting at constrained bitrates
ⓘ
mobile audio streaming ⓘ streaming audio over low-bandwidth connections ⓘ |
| usedFor |
extending audio bandwidth in compressed audio signals
ⓘ
improving audio compression efficiency at low bitrates ⓘ reconstructing high-frequency audio components ⓘ |
| uses |
envelope parameters for high-frequency bands
ⓘ
noise-like and tonal components modeling ⓘ side information to guide high-frequency reconstruction ⓘ |
| worksBy |
copying and transposing low-frequency spectral components to higher bands
ⓘ
shaping reconstructed high-frequency content using transmitted envelope data ⓘ |
Referenced by (1)
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