IEEE Std 1857.2-2013
IEEE Standard for Advanced Audio Coding
Copyright © 2013 IEEE. All rights reserved.
5
Parcor coefficients: Parcor representation of the predictor coefficients.
reserved: Some special syntactic elements that may be used in the future for extensions of this part. All the
reserved values should be set to “1” unless specifically stated.
sampling frequency (fs): The number of samples per unit of time taken from a continuous audio signal to
make
a discrete audio signal.
scal
ability: An ability of a decoder that decodes ordered sets of bitstream to reconstruct audio streams.
scalefactor band: A set of spectral coefficients that are scaled by one scalefactor.
scalefactor index: A numerical code for a scalefactor.
scalefactor: Factor by which a set of values are scaled before quantization.
side information: Information in the bitstream necessary for controlling the decoding.
spectral coefficient: Discrete frequency domain data output from the analysis filterbank.
spectral envelope: The frequency-amplitude curve of the signal after a time-frequency transform.
square polar stereo code: A stereo coding method that eliminates correlation of the spectral signal of left
and right channels by matrix transformation.
square polar stereo mode: An audio coding method using the square polar stereo code algorithm.
steady signal: A type of signal whose energy and other characteristics change slowly over time. It is
analyzed by long window sequences.
stuffing: Code words that may be inserted into the coded bitstream and are to be discarded in the decoding
process. Their purpose is to increase the bitrate of the stream that would otherwise be lower than the
desired bitrate. Beyond that, the additional coding data can use these bytes or bits as well.
syncword: Data of 12 bits embedded in an audio bitstream that indicates the start of a frame.
synthesis filterbank: Filterbank in the decoder that reconstructs a pulse-code modulation (PCM) audio
signal from subband samples.
temporal stability two-level decision: A two-level decision method used to describe the temporal stability
of the signal time domain and to decide whether frequency-domain linear prediction and vector
quantization (FLPQV) is applied.
time-frequency transform: Transformation of the signal from time domain to frequency domain.
transient signal: A type of siganl whose energy and other characteristics change rapidly over time. It is
analyzed by short window sequences.
variable length code (VLC): A code word assigned by a variable length encoder See: variable length
coding.
variable length coding: A reversible coding procedure that assigns shorter code words to frequent symbols
and longer code words to less frequent symbols.
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