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全面介绍了3GPP2公布的CDMA2000移动通信系统中的可选择模式语音编码算法(SMV),并着重讨论了SMV算法对语音进行编码和解码过程中的EX-CELP算法、语音分类处理,自适应码本贡献时域去加重和编码速率选择等关键技术。仿真结果表明,它在灵活调整平均编码速率的同时可以提供优良的话音质量,满足第三代移动通信系统对语音编码高质量和变速率的要求,能够使通话服务质量与信道利用率之间达到较为理想的均衡。
This paper introduces the optional mode voice coding algorithm (SMV) in CDMA2000 mobile communication system released by 3GPP2 in an all-round way and discusses the EX-CELP algorithm, speech classification processing, adaptive codebook Contribute to the time domain exacerbation and coding rate selection and other key technologies. The simulation results show that it can provide excellent voice quality while flexibly adjusting the average coding rate and meet the requirements of high-quality and variable-rate voice coding of the third generation mobile communication system, and can achieve the communication service quality and channel utilization rate The ideal balance.