TMS320C54x Application-specific Examples

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1、ApplicationReportSPRA672-June2000Application-SpecificExamplesfortheTMS320C54xDSPC5000ApplicationsTeamDigitalSignalProcessingSolutionsABSTRACTThisapplicationreportshowsexamplesoftypicalapplicationsfortheTMS320C54xäDSP.SincethisDSPiswidelyusedforspeechcodingandtelecommunications,the

2、applicationsshowhowsomeaspectsofthesefunctionsareimplemented.Contents1CodebookSearchforExcitationSignalinSpeechCoding..............................12ViterbiAlgorithmforChannelDecoding...............................................3ListofFiguresFigure1.CELP-BasedSpeechCoder........

3、...............................................2Figure2.ButterflyStructureoftheTrellisDiagram............................................4Figure3.PointerManagementandStorageSchemeforPathMetrics...........................5ListofTablesTable1.CodeGeneratedbytheConvolutionalEncoder...

4、....................................4ListofEquationsEquation1.OptimumCodeVectorLocalization...............................................2Equation2.CrossCorrelationVariable(ci)...................................................2Equation3.EnergyVariable(Gi)........................

5、....................................2Equation4.OptimalCodeVectorCondition...................................................3Equation5.PolynomialsforConvolutionalEncoding...........................................3Equation6.BranchMetric.............................................

6、.....................4ListofExamplesExample1.CodebookSearch.............................................................3Example2.ViterbiOperatorforChannelCoding.............................................61CodebookSearchforExcitationSignalinSpeechCodingAcode-excitedlinearpredict

7、ive(CELP)speechcoderiswidelyusedforapplicationsrequiringspeechcodingwithabitrateunder16Kbps.Thespeechcoderusesavectorquantizationtechniquefromcodebookstoanexcitationsignal.Thisexcitationsignalisappliedtoalinearpredictive-coding(LPC)synthesisfilter.Toobtainoptimumcodevectorsfromthe

8、codebooks,acodebooksearchisperfor