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2007 Multimedia System Final Paper Presentation Music Recognition. 492410021 蘇冠年 492410070 蔡尚穎. Introduction. In future, the problem is not anymore how to get access to multimedia content, the task is how to find what I’m looking for…. Music Recognition System. Data Base. Input Data.
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2007 Multimedia System Final Paper PresentationMusic Recognition 492410021 蘇冠年 492410070 蔡尚穎
Introduction • In future, the problem is not anymore how to get access to multimedia content, the task is how to find what I’m looking for…
Music Recognition System Data Base Input Data Training Recognition Result
Before the Algorithm • Practical Problems - Disturbance of noise - Disturbance of Harmonic - Singer and instrument - …
Algorithm I • Pitch detection - notes, chords … • Based on frequency domain - according to music characteristics, it analyzed spectrum at the music pitches - using Wavelet Transform and DTFT (Discrete-Time Fourier Transform)
Frequency Analysis • Music signal is of typical time-frequency distribution and hasshort-time steadyproperty
Frequency Analysis • Wavelet Transform - Daub4 Wavelet base by Mallet Algorithm • DTFT to calculate amplitude - pitch frequency as parameter ω
Frequency Analysis • Analyzed result
Notes Recognition • Step 1: Note Voting - 1. analyzed each data by wavelet transform in frequency domain. - 2. picked out a numbers of notes that have biggest amplitudes in a data as candidate notes. - 3. count of the appearance times of the candidate notes in several neighbor dada • Step 2 : denote the different segments of the music • Step 3 : selected the note that appears most and has the biggest average amplitude
- A piece of music - Wave form of the data
Chords Recognition • What is the chord ? • The chord components always have the similar amplitude in frequency domain
Chords Recognition • Step 1 : define as a set of candidate notes and as the amplitude of the notes p • Step 2 : calculate likelihood coefficientof each note • Step 3 : coefficient L is the average likelihood coefficient among the notes in a candidate chord
- A piece of music - Wave form of the data
Algorithm II • Items of recognizing • Single-pitched melody • Multiple-instrument melody
Adaptive Template-matching • Phase Tracking • Template Filtering
Phase Tracking z : input signal r , i : possible sound p : narrow-band filter
Phase Tracking • fs : sampling frequency • fc : center frequency of the band-pass filter
Template Filtering • minimization of J z(k) : input sum of template waveforms hn(m) : convolution of the filter coefficients rn(k) : phase-adjusted waveform
Music Stream Networks • Problem of local information • Bayesian probabilistic network
Reference • Zheng Cao, Shengxiao Guan, Zengfu Wang.“A Real-time Algorithm for Music Recognition Based on Wavelet Transform”IEEEJune 21 - 23, 2006, Dalian, China 2. Kunio Kashino ,Hiroshi Murase.“Music Recognition using Note Transition Context” IEEE1998, NTT Basic Research Laboratories 3. Karlheinz Brandenburg. “Digital Entertainment: Media technologies for the future” IEEE 2006 , Fraunhofer IDMT & Technische Universität Ilmenau 4. Chen Genfand, Xia Shunren. “The study and prototype system of printed music recognition”. IEEE 2003 • D Bainbridge , T C Bell. “Dealing with superimposed objects in optical music recognition” IEEE15-17 July 1997 Universities of Waikato and Canterbury, New Zealand 6. MALLAT'S FAST WAVELET ALGORITHM: RECURSIVE COMPUTATION OF CONTINUOUS-TIME WAVELET COEFFICIENTS