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    • 9. 发明授权
    • Digital signal processing apparatus and method
    • 数字信号处理装置及方法
    • US06941333B2
    • 2005-09-06
    • US10079800
    • 2002-02-20
    • Makoto AkuneYasuhiro Ogura
    • Makoto AkuneYasuhiro Ogura
    • G10L11/00G10L21/02H03M7/32G06F17/17G06F17/10
    • H03M7/3008H03M7/3028H03M7/304
    • A normalizer normalizes the power of a dither signal calculated by a power calculator based on the average power of a PCM signal in the range of 18 kHz to 20 kHz, wherein the average power is calculated by the power calculator. An oversampling processor oversamples the PCM signal with a quantization frequency of 44.1 kHz and a quantization word length of 16 bits, wherein the PCM signal is inputted from an input terminal at a sampling frequency of 2×44.1 kHz, and then supplies an output of the oversampling process to an adder. The adder adds the normalized output from the normalizer to the oversampling output from the oversampling processor, and then supplies the addition output to an oversampling processor.
    • 归一化器根据功率计算器根据PCM信号在18kHz至20kHz范围内的平均功率计算出的抖动信号的功率进行归一化,其中平均功率由功率计算器计算。 过采样处理器以44.1kHz的量化频率和16位的量化字长度对PCM信号进行过采样,其中PCM信号以2x44.1kHz的采样频率从输入端输入,然后提供 过采样处理到加法器。 加法器将归一化器的归一化输出与过采样处理器的过采样输出相加,然后将加法输出提供给过采样处理器。