发明授权
- 专利标题: Detecting musical structures
- 专利标题(中): 检测音乐结构
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申请号: US12760522申请日: 2010-04-14
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公开(公告)号: US08983082B2公开(公告)日: 2015-03-17
- 发明人: Cynthia Maxwell , Frank Martin Ludwig Gunter Baumgarte
- 申请人: Cynthia Maxwell , Frank Martin Ludwig Gunter Baumgarte
- 申请人地址: US CA Cupertino
- 专利权人: Apple Inc.
- 当前专利权人: Apple Inc.
- 当前专利权人地址: US CA Cupertino
- 代理机构: Blakely, Sokoloff, Taylor & Zafman LLP
- 主分类号: H04R29/00
- IPC分类号: H04R29/00 ; G10H1/043 ; G10H1/40 ; H04R5/027 ; G10H1/36
摘要:
Among other things, techniques and systems are disclosed for detecting musical structures, such as downbeats. In one aspect, a method performed by a data processing device includes receiving an input audio signal. The method includes detecting a meter in the received audio signal. Detecting the meter includes generating an envelope of the received audio signal; generating an autocorrelation phase matrix having a two-dimensional array based on the generated envelope to identify a dominant periodicity in the received audio signal; and filtering both dimensions of the generated autocorrelation phase matrix to enhance peaks in the two-dimensional array. The meter represents a time signature of the input audio signal having multiple beats. Additionally, the method includes identifying a downbeat as a first beat in the detected meter.
公开/授权文献
- US20110255700A1 Detecting Musical Structures 公开/授权日:2011-10-20