This article proposes a behavior model of workforce movement based on the disparity analysis in many aspects that exists in urban and rural areas , which shows the economic behaviour reason and its decisive condition of the rural workforce movement , and point out that the fabulosity of change rural backward situation by the rural - urban workforce movement as well as the basic way to narrow disparity in urban and rural areas and solve the urban pressure on employment is to quicken the development of rural economy 在分析城乡存在的多方面差距的基础上，提出一个劳动力迁移的行为模型，用以说明农村劳动力迁移的经济行为动因及其决定条件，指出完全依靠农村城市劳动力迁移来改变农村落后局面的不现实性，最后提出加快农村发展是解决城市就业压力，缩小城乡差距的根本之道。
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In this paper , combined with currently voice coding technique , espically with the fabulosity development of the mixed voice coding and the increasingly utility of the digital signals processor . we investigated the voice coding technique and discussed emphasizedly the technology of variable rate voice coding technology 本文结合当前语音编码技术尤其是混合编码技术的惊人发展及数字信号处理器的日益实用化，研究了语音编码技术，并重点讨论了变速率语音编码技术。论文简要介绍语音编码技术中的波形编码和声码器的主要性能。
