Method and apparatus for eighth-rate random number generation for speech coders
    1.
    发明授权
    Method and apparatus for eighth-rate random number generation for speech coders 有权
    用于语音编码器的八进制随机数生成的方法和装置

    公开(公告)号:US06226607B1

    公开(公告)日:2001-05-01

    申请号:US09248516

    申请日:1999-02-08

    IPC分类号: G10L1912

    CPC分类号: G10L19/012 G10L19/24

    摘要: A method and apparatus for eighth-rate random number generation for speech coders includes a random number generator configured to generate values of a first random variable. A lookup table is used to store values of a second random variable. The lookup table is addressed with the values of the first random variable. The second random variable is an inverse transform of a cumulative distribution function of the first random variable. An codec encodes input silence frames with the values of the first and second random variables, and regenerates the silence frames with the values of the first and second random variables. The speech coder may be an enhanced variable rate coder, and the silence frames may be encoded at eighth rate. The random variables are advantageously Gaussian random variables with values that are uniformly distributed between zero and one.

    摘要翻译: 用于语音编码器的用于八进制随机数生成的方法和装置包括被配置为生成第一随机变量值的随机数发生器。 查找表用于存储第二个随机变量的值。 查找表用第一个随机变量的值进行寻址。 第二随机变量是第一随机变量的累积分布函数的逆变换。 编解码器使用第一和第二随机变量的值对输入的静默帧进行编码,并且利用第一和第二随机变量的值重新生成静默帧。 语音编码器可以是增强型可变速率编码器,并且静音帧可以以第八速率进行编码。 随机变量有利的是高斯随机变量,其值均匀分布在零和一之间。