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    • 8. 发明授权
    • Background noise eliminating apparatus and method, and storage medium storing program realizing such method
    • 背景噪声消除装置和方法以及实现这种方法的存储介质存储程序
    • US06760690B2
    • 2004-07-06
    • US09944239
    • 2001-08-31
    • Akio Takahashi
    • Akio Takahashi
    • H04B1500
    • G10K15/02H04S7/305
    • A CPU of an effector calculates envelopes of an impulse response waveform from sample data of impulse response waveform data supplied from a microphone via an A/D converter circuit. Next, CPU detects a section during which a slope of the detected envelopes takes a value near “0” during a predetermined time or longer. CPU calculates an average value of sample data during the detected section to correct a DC offset. Thereafter, CPU acquires a maximum value of absolute values among the sample data during the detected section, and determines this maximum value as a background noise component value. The background noise components are removed from each sample data constituting the impulse response waveform data.
    • 效应器的CPU通过A / D转换器电路从麦克风提供的脉冲响应波形数据的样本数据中计算脉冲响应波形的包络。 接下来,CPU在预定时间或更长时间内检测检测到的信封的斜率在“0”附近取值的部分。 CPU在检测到的部分中计算采样数据的平均值,以校正直流偏移。 此后,CPU在检测部分期间获取采样数据中的绝对值的最大值,并将该最大值确定为背景噪声分量值。 从构成脉冲响应波形数据的每个采样数据中去除背景噪声分量。