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    • 11. 发明申请
    • SOUND SIGNAL PROCESSING APPARATUS
    • 声信号处理装置
    • US20090041264A1
    • 2009-02-12
    • US12187576
    • 2008-08-07
    • Yasunori YAMAMOTO
    • Yasunori YAMAMOTO
    • H04B15/00
    • H03K7/08H03F3/217
    • An audio signal processing apparatus for outputting an input digital audio signal as a positive phase PWM signal and a negative phase PWM signal. The resolution of the input digital audio signal is converted to a low resolution and noise shaping is performed to generate a positive phase digital signal (REF_P) and a negative phase digital signal (REF_N). Both signal patterns are compared at a buffer and pattern comparator section when muting. If the signal patterns match, a selector outputs a set value having 50% duty instead of the digital signals to optimize timing for switching to 50% duty when muting.
    • 一种用于输出输入数字音频信号作为正相PWM信号和负相位PWM信号的音频信号处理装置。 输入数字音频信号的分辨率被转换为低分辨率,并执行噪声整形以产生正相数字信号(REF_P)和负相位数字信号(REF_N)。 当静音时,两个信号模式在缓冲器和模式比较器部分进行比较。 如果信号模式匹配,选择器输出具有50%占空比的设置值而不是数字信号,以优化当静音时切换到50%占空比的定时。