Information processing apparatus, melody line extraction method, bass line extraction method, and program
AssigneeSony Corporation
InventorYoshiyuki Kobayashi
Life of this patent
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Abstract
An information processing apparatus is provided which includes a signal conversion unit for converting an audio signal to a pitch signal indicating a signal intensity of each pitch, a melody probability estimation unit for estimating for each frame a probability of each pitch being a melody note, based on the audio signal, and a melody line determination unit for detecting a maximum likelihood path from among paths of pitches from a start frame to an end frame of the audio signal, and for determining the maximum likelihood path as a melody line, based on the probability of each pitch being a melody note, the probability being estimated for each frame by the melody probability estimation unit.
Claims12
An information processing apparatus comprising:
- a signal conversion unit for converting an audio signal to a pitch signal indicating a signal intensity of each pitch;
- a melody probability estimation unit for estimating for each frame a probability of each pitch being a melody note, based on the audio signal;
- and
- a melody line determination unit for detecting a maximum likelihood path from among paths of pitches from a start frame to an end frame of the audio signal, and for determining the maximum likelihood path as a melody line, based on the probability of each pitch being a melody note, the probability being estimated for each frame by the melody probability estimation unit.
An information processing apparatus comprising:
- a signal conversion unit for converting an audio signal to a pitch signal indicating a signal intensity of each pitch;
- a bass probability estimation unit for estimating for each frame a probability of each pitch being a bass note, based on the audio signal;
- and
- a bass line determination unit for detecting a maximum likelihood path from among paths of pitches from a start frame to an end frame of the audio signal, and for determining the maximum likelihood path as a bass line, based on the probability of each pitch being a bass note, the probability being estimated for each frame by the bass probability estimation unit.
A melody line extraction method, comprising the steps of:
- converting an audio signal to a pitch signal indicating a signal intensity of each pitch;
- estimating for each frame a probability of each pitch being a melody note, based on the audio signal;
- and
- detecting a maximum likelihood path from among paths of pitches from a start frame to an end frame of the audio signal, and determining the maximum likelihood path as a melody line, based on the probability of each pitch being a melody note, the probability being estimated for each frame by the step of estimating a probability of each pitch being a melody note,
- wherein
- the steps are performed by an information processing apparatus.
A bass line extraction method, comprising the steps of:
- converting an audio signal to a pitch signal indicating a signal intensity of each pitch;
- estimating for each frame a probability of each pitch being a bass note, based on the audio signal;
- and
- detecting a maximum likelihood path from among paths of pitches from a start frame to an end frame of the audio signal, and determining the maximum likelihood path as a bass line, based on the probability of each pitch being a bass note, the probability being estimated for each frame by the step of estimating a probability of each pitch being a bass note,
- wherein
- the steps are performed by an information processing apparatus.
A non-transitory computer-readable storage device storing a computer program, which when executed by a computer, performs a method comprising the steps of:
- converting an audio signal to a pitch signal indicating a signal intensity of each pitch;
- estimating for each frame a probability of each pitch being a melody note, based on the audio signal;
- and
- detecting a maximum likelihood path from among paths of pitches from a start frame to an end frame of the audio signal, and determining the maximum likelihood path as a melody line, based on the probability of each pitch being a melody note, the probability being estimated for each frame by the step of estimating a probability of each pitch being a melody note.
A non-transitory computer-readable storage device storing a computer program, which when executed by a computer, performs a method comprising the steps of:
- converting an audio signal to a pitch signal indicating a signal intensity of each pitch;
- estimating for each frame a probability of each pitch being a bass note, based on the audio signal;
- and
- detecting a maximum likelihood path from among paths of pitches from a start frame to an end frame of the audio signal, and determining the maximum likelihood path as a bass line, based on the probability of each pitch being a bass note, the probability being estimated for each frame by the step of estimating a probability of each pitch being a bass note.
Dependencies are inferred from the claim text.