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    • 1. 发明申请
    • FAST FREQUENCY-DOMAIN PITCH ESTIMATION
    • 快速频域点估计
    • WO0207363A3
    • 2002-05-16
    • PCT/IL0100644
    • 2001-07-12
    • IBMCHAZAN DANZIBULSKI MEIRHOORY RON
    • CHAZAN DANZIBULSKI MEIRHOORY RON
    • G10L25/90G10L11/04
    • G10L25/90
    • A method for estimating a pitch frequency of an audio signal includes computing a first transform of the signal to a frequency domain over a first time interval (42), and computing a second transform of the signal of the frequency domain over a second time interval (44), which contains the first time interval. A line spectrum of the signal is found, based on the first and second transforms, the spectrum including spectral lines having respective line amplitudes and line frequencies. A utility function (130) that is periodic in the frequencies of the lines in the spectrum is then computed. This function is indicative (158), for each candidate pitch frequency in a given pitch frequency range, of a compatibility of the spectrum with the candidate pitch frequency. The pitch frequency of the speech signal is estimated responsive to the utility function (176, 178).
    • 一种用于估计音频信号的音调频率的方法包括:在第一时间间隔(42)上计算信号到频域的第一变换(42),以及在第二时间间隔上计算频域信号的第二变换( 44),其包含第一时间间隔。 基于第一和第二变换,发现包括具有各自线路幅度和线路频率的谱线的频谱的信号线谱。 然后计算在频谱中的线的频率中周期性的效用函数(130)。 对于给定音调频率范围内的每个候选音调频率,该功能指示(158)频谱与候选音调频率的兼容性。 响应于效用函数来估计语音信号的音调频率(176,178)。