amr语音编码技术与实现

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1、WCDMA系统中AMR语音编码技术与实现个人通信与扩频实验室2003.6.信源速率编码模式信源编码比特率AMR12212.20kbit/sAMR10210.20kbit/sAMR7957.95kbit/sAMR7407.40kbit/sAMR6706.70kbit/sAMR5905.90kbit/sAMR5155.15kbit/sAMR4754.75kbit/sAMRSID1.80kbit/s发送端处理框图接收端处理框图CELP语音合成模型短时预测，长时预测编码器算法框图解码器算法框图编码器模块图解码器模块图AMR语音编码器在系统中的位置语

2、音数据流向平均意见得分（MOS）ScoreQualityDistortion5Excellent(E)不察觉4Good(G)刚有察觉3Fair(F)有察觉且稍觉可厌2Poor(P)明显察觉且可厌但可忍受1Bad(B)不可忍受语音客观评定方法ObjectiveSpeechMeasureObjectiveSpeechMeasure1.SNR-basedmeasure3.SpectraldistancebasemeasureSNR0.38Spectraldistance(1-norm)0.51SegmentalSNR0.65Energyweigh

3、tedspectraldistance(1-norm)0.27FrequencyvariantSNR0.43FrequencyweightedSD(2-norm)0.41FrequencyvariantsegmentalSNR0.69AuditoryfrequencyweightedSD(1-norm)0.482.LPC-basedmeasureLogspectraldistance(5-norm)0.68LPC0.41EnergyweightedlogSD(1-norm)0.55LogLPC0.34Auditoryfrequencywei

4、ghtedlogSD(5norm)0.78Logarearatio0.55Inverselogspectraldistance(5-norm)0.75PARCOR0.504.PsychoacousticallymotivatedmeasureLogPARCOR0.07Melspectraldistance0.86Loglikelihoodratio0.48Barkspectraldistance0.83Weightedlikelihoodratio0.485.OthermeasureGroupdelayspectrum0.36Crossco

5、rrelationofwaveformpower0.15Linespectrumpairs0.35Discretecosinetransformdistance0.39Cepstraldistance0.62Coherencefunction0.81性能分析流程和测试序列类型噪声激活强度T01女无-19.4dBovT02男无-18.7dBovT03女汽车-35.5dBovT04女汽车-26.1dBovT05男混叠-15.0dBovT01T02T03T04T05速率分类高速率中速率低速率12.2kb/s10.2kb/s7.95kb/s7.4k

6、b/s6.7kb/s5.9kb/s5.15kb/s4.75kb/s速率切换门限和组合门限1门限2门限3C/I11.5dB7.0dB5.5dB速率组合SET112.2kb/s，7.95kb/s，5.9kb/sSET212.2kb/s，7.95kb/sSET312.2kb/s，7.95kb/s，6.7kb/s，5.15kb/s速率切换试验结果系统模型