公开(公告)号：US20140260912A1

公开(公告)日：2014-09-18

申请号：US14212022

申请日：2014-03-14

Applicant: YAMAHA CORPORATION

Inventor： Akira MAEZAWA

IPC: G10H1/40

CPC classification number: G10H1/40 ,  G10H7/00 ,  G10H2210/031 ,  G10H2210/051 ,  G10H2210/061 ,  G10H2210/076 ,  G10H2210/385 ,  G10H2220/081 ,  G10H2250/015

Abstract: A sound signal analysis apparatus 10 includes sound signal input portion for inputting a sound signal indicative of a musical piece; feature value calculation portion for calculating a first feature value indicative of a feature relating to existence of a beat in one of sections of the musical piece and a second feature value indicative of a feature relating to tempo in one of the sections of the musical piece; and estimation portion for concurrently estimating a beat position and a change in tempo in the musical piece by selecting, from among a plurality of probability models described as sequences of states q classified according to a combination of a physical quantity relating to existence of a beat in one of the sections of the musical piece and a physical quantity relating to tempo in one of the sections of the musical piece, a probability model whose sequence of observation likelihoods each indicative of a probability of concurrent observation of the first feature value and the second feature value in corresponding one of the sections of the musical piece satisfies a certain criterion.

Abstract translation: 声音信号分析装置10包括用于输入指示乐曲的声音信号的声音信号输入部分; 特征值计算部分，用于计算指示与音乐作品的一个部分中的节拍的存在有关的特征的第一特征值和指示与乐曲的其中一个部分中的节奏相关的特征的第二特征值; 以及估计部分，用于通过从被描述为根据与节拍存在有关的物理量的组合分类的状态序列q的多个概率模型中选择来同时估计节奏位置和节奏的改变 音乐作品的一部分和与乐曲的其中一部分相关的速度的物理量，概率模型，其观察似然性序列各自表示同时观察第一特征值的概率和第二特征 音乐作品的相应部分中的值满足一定的标准。