Signal processing device, signal processing method, and program

Details Signal processing device, signal processing method, and program Signal processing device, signal processing method, and program

2011-01-04

2011-01-04

Enad, Elvin G (Department: 2832)

Music

Instruments

Electrical musical tone generation

C084S601000, C084S603000

Reexamination Certificate

active

07863512

ABSTRACT:
There is provided a signal processing device for processing an audio signal, the signal processing device including: an onset time detection unit for detecting an onset time based on a level of the audio signal; and a beat length calculation unit for obtaining a beat length Q by: setting an objective function P(Q|X) and an auxiliary function, the objective function P(Q|X) representing a probability that, when an interval X between the onset times is given, the interval X is the beat length Q, the auxiliary function being for inducing an update of both the beat length Q and a tempo Z that results in a monotonous increase of the objective function P(Q|X); and repeating maximization of the auxiliary function to have the auxiliary function converge.

REFERENCES:
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patent: 2005-274708 (2005-10-01), None
patent: 2006-251712 (2006-09-01), None
T. Otsuki et al., “Musical Rhythm Recognition Using HMM and NoteN-gram”, Information Processing Society Memoir, vol. 2001, No. 103, Information Processing Society of Japan, pp. 61-68 (2001).
H. Takeda et al., “Joint Estimating of Rhythm and Tempo of Polyphonic MIDI Performance Using Tempo Curve and Hidden Markov Models”, Information Processing Society of Japan, vol. 48, No. 1, pp. 237-247 (2007).
Notification of Reasons for Refusal dated Dec. 14, 2009, (Issued on Dec. 22, 2009) in Japanese Application No. 2007-317722.

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