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    • 8. 发明申请
    • TRANSCODER
    • US20090009370A1
    • 2009-01-08
    • US12144098
    • 2008-06-23
    • Hiromu HasegawaMiyuki Yanagida
    • Hiromu HasegawaMiyuki Yanagida
    • H03M7/00
    • H04N19/40H04N19/124H04N19/149H04N19/61
    • A transcoder calculates a reference conversion factor on the basis of a ratio between a total target bit rate of a whole second stream and an total input bit rate of a whole first stream and calculates a coefficient of variation from the total target bit rate of the whole second stream and an average output bit rate of a converted second stream in the N period. Next, a quantization step conversion factor in the next (N+1) period is calculated by adding the coefficient of variation to the reference conversion factor. Then, a quantization step value of a second stream in the (N+1) period is calculated by multiplying a quantization step value of a first stream in the (N+1) period by the quantization step conversion factor.
    • 代码转换器基于整个第二流的总目标比特率与整个第一流的总输入比特率之间的比率来计算参考转换因子,并且从整体的总目标比特率计算变异系数 第二流和在N个周期中转换的第二流的平均输出比特率。 接下来,通过将变化系数与参考转换因子相加来计算下一个(N + 1)周期中的量化步长转换因子。 然后,通过将第(N + 1)个周期中的第一流的量化步长值乘以量化步长转换因子来计算第(N + 1)周期中的第二流的量化步长值。