Spectral Band Replication

<audio, compression> (SBR) Guessing the nontransmitted higher frequency range of a compressed audio file by some helper bits (transmiited with the stream) and the transmitted base band. SBR allows a restoration (not reconstruction) of the upper frequency range without lots of bits.

It was developed by Coding Technology (http://www.codingtechnolgy.com/), and is useful for medium and high quality coding at low and medium data rates.

It is used by Digital Radio Mondiale and MP3 Pro.

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SPEC rate
SPEC ratio
speculative evaluation
speculative execution
Speech Application Programming Interface
speech recognition