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    • 2. 发明授权
    • Recording or playback apparatus and musical piece detecting apparatus
    • 记录或播放装置和乐曲检测装置
    • US07745714B2
    • 2010-06-29
    • US12053647
    • 2008-03-24
    • Satoru MatsumotoYuji YamamotoTatsuo Koga
    • Satoru MatsumotoYuji YamamotoTatsuo Koga
    • G10H1/00
    • G10H1/0008G10H2210/046G10H2210/066G10H2240/061
    • Provided is a recording or playback apparatus capable of separating a musical piece from an audio including the musical piece and a speech through a simple arithmetic process. A cut point detector detects, as a cut point, a time point at which an audio signal level or an amount of change in the audio signal level is not lower than a predetermined value. A frequency characteristic amount calculator calculates a characteristic amount in a frequency area of the audio signal only at each cut point and in its proximity. A cut point judging unit judges an attribute of the cut point on a basis of the calculated characteristic amount of the frequency. A music section detector detects a start and end points of each music section on a basis of the attribute and an interval between sampling points.
    • 提供了一种能够通过简单的算术处理将音乐作品与包括音乐作品的音频和语音分离的记录或重放装置。 切点检测器检测音频信号电平或音频信号电平的变化量不低于预定值的时间点作为切点。 频率特征量计算器仅在每个切割点和其接近处计算音频信号的频率区域中的特征量。 切点判定部基于计算出的频率特征量来判断切断点的属性。 音乐部分检测器基于属性和采样点之间的间隔检测每个音乐部分的开始和结束点。