Table of Contents
1Introduction
1.1Scope
1.2Bitrates
1.3Possibleinputsignals
1.4Delay
1.5Speechcoderdescription
2Encoderprinciples
2.1Generaldescription
2.2Framer
2.3Highpassfilter
2.4LPCanalysis
2.5LSPquantizer
2.6LSPdecoder
2.7LSPinterpolation
2.8Formantperceptualweightingfilter
2.9Pitchestimation
2.10Subframeprocessing
2.11Harmonicnoiseshaping
2.12Impulseresponsecalculator
2.13Zeroinputresponseandringingsubtraction
2.14Pitchpredictor
2.15Highrateexcitation(MP-MLQ)
2.16Lowrateexcitation(ACELP)
2.17Excitationdecoder
2.18Decodingofthepitchinformation
2.19Memoryupdate
2.20Bitallocation
2.21Coderinitialization
3Decoderprinciples
3.1Generaldescription
3.2LSPdecoder
3.3LSPinterpolator
3.4Decodingofthepitchinformation
3.5Excitationdecoder
3.6Pitchpost-filter
3.7LPCsynthesisfilter
3.8Formantpost-filter
3.9Gainscalingunit
3.10Frameinterpolationhandling
3.11Decoderinitialization
4Bitstreampacking
5ANSICcode
6Glossary
AnnexA-Silencecompressionscheme
A.1Introduction
A.2DescriptionoftheVAD
A.3GeneraldescriptionoftheCNG
A.4DescriptionoftheCNGencoderpart
A.5Descriptionofthedecoderpart
A.6Bitstreampacking
A.7Glossary
A.8Bit-exact,fixed-pointCsourcecode
AnnexB-Alternativespecificationbasedonfloatingpoint
arithmetic
B.1Introduction
B.2Algorithmdescription
B.3ANSICcode
AnnexC-Scalablechannelcodingschemeforwireless
applications
C.1Introduction
C.2Channelencoder
C.3Channeldecoder
C.4FixedpointCsourcecode Abstract
Specifies a coded representation that can be used for compressing the speech or other audio signal component of multimedia services at a very low bit rate as part of the overall H.324 family of standards.
