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Spectral band replication (SBR) is an audio bandwidth-extension technique: a codec transmits a coded lower-frequency band plus compact information about the upper band, and the decoder uses both to reconstruct high frequencies. It is used with codecs such as AAC to help preserve audio bandwidth or improve coding efficiency at constrained bit rates. The reconstructed high band is an estimate, not a lossless copy of the original.
How spectral band replication works
The encoder analyzes the original wideband audio and sends the lower-frequency portion through a core audio codec. It also sends a small amount of side information describing characteristics of the high-frequency portion. At playback, the decoder uses the decoded lower band as a basis for generating upper-frequency content, then adjusts that content according to the transmitted parameters.
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In MPEG’s overview, reconstruction takes place in a quadrature mirror filter (QMF) domain. The decoder extends content into the high band by patching lower-frequency QMF subbands and uses bitstream parameters to shape the high-band spectral envelope and balance tonal and noise-like content. The overview gives roughly 5–13 kHz as an example of a low-frequency region handled by the core codec; that range is not a universal SBR cutoff. MPEG’s SBR overview (N7464, July 2005) describes the process.
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Why SBR is used
SBR is designed for efficient audio coding when bit rates are constrained. Rather than sending the entire high-frequency signal directly, the encoder sends information that lets the decoder estimate it from the transmitted lower frequencies. This can increase audio bandwidth at a given bit rate or improve coding efficiency for a given quality level, as described by ITU-R Recommendation BS.1196-7 (2019).
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Because the upper band is reconstructed rather than transmitted as the original waveform, SBR should not be described as lossless recovery. Its intended benefits also do not guarantee that every signal will sound better to every listener.
How SBR relates to AAC and HE-AAC
SBR can be combined with a core codec such as AAC. MPEG describes AAC-LC with SBR as the High Efficiency AAC profile (HE-AAC); adding Parametric Stereo to AAC-LC and SBR forms HE-AAC v2. MPEG also identifies two SBR versions: SBR-HQ (High Quality) and SBR-LP (Low Power).
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The standards context includes MPEG’s catalog entry for ISO/IEC 13818-7:2006, which supplements information on using SBR, specified in ISO/IEC 14496-3, with MPEG-2 AAC. These profile and standards references explain where SBR fits in audio coding; they do not establish that every device can decode every SBR file.
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SBR appears in both platform and codec documentation. Apple lists AAC_SBR as an MPEG-4 audio object-type constant and describes it as reconstructing high-frequency content from lower frequencies and side information. FFmpeg documents a SpectralBandReplication decoder structure. Those references show that software and standards represent SBR, but compatibility still depends on the particular file, decoder, and playback device.
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