Pitch emphasis apparatus, method, program, and recording medium for the same
AssigneeNippon Telegraph and Telephone Corporation
InventorsYutaka KAMAMOTO, Ryosuke SUGIURA, Takehiro MORIYA
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Abstract
As pitch enhancement processing, a pitch enhancement apparatus obtains, for a time segment judged to be a time segment including a signal that is a consonant, for each time of the time segment, as an output signal, a signal including a signal obtained by adding a signal, which was obtained by multiplying a signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, the pitch gain σ0 of the time segment, a predetermined constant B0, and a value that is greater than 0 and less than 1, and a signal at the time.
Claims10
A pitch enhancement apparatus that obtains an output signal by performing, for each time segment, pitch enhancement processing on a signal derived from an input audio signal, the pitch enhancement apparatus comprising:
- processing circuitry configured to:
- perform, as the pitch enhancement processing,
- for a time segment judged to be a time segment including the signal that is a consonant, for each time of the time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, a predetermined constant B0, and a value that is greater than 0 and less than 1, and
- the signal at the time, and
- for a time segment judged to be a time segment including the signal that is not a consonant, for each time of the time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, and a predetermined constant B0, and
- the signal at the time.
A pitch enhancement apparatus that obtains an output signal by performing, for each time segment, pitch enhancement processing on a signal derived from an input audio signal, the pitch enhancement apparatus comprising:
- processing circuitry configured to:
- perform, as the pitch enhancement processing, for each time n of each time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time n by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, and a value that becomes smaller as the consonant-likeness of the time segment becomes higher, and
- the signal at the time n.
A pitch enhancement apparatus that obtains an output signal by performing, for each time segment, pitch enhancement processing on a signal derived from an input audio signal, the pitch enhancement apparatus comprising:
- processing circuitry configured to:
- perform, as the pitch enhancement processing,
- for a time segment judged to be a time segment including the signal that is a consonant or/and the signal whose spectral envelope is flat, for each time of the time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, a predetermined constant B0, and a value that is greater than 0 and less than 1, and
- the signal at the time, and
- for a time segment about which a judgment other than that described above has been made, for each time of the time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, and a predetermined constant B0, and
- the signal at the time.
A pitch enhancement apparatus that obtains an output signal by performing, for each time segment, pitch enhancement processing on a signal derived from an input audio signal, the pitch enhancement apparatus comprising:
- processing circuitry configured to:
- perform, as the pitch enhancement processing, for each time n of each time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time n by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, and a value that becomes smaller as the consonant-likeness of the time segment becomes higher and that becomes smaller as the flatness of a spectral envelope of the time segment becomes higher, and
- the signal at the time n.
A pitch enhancement method for obtaining an output signal by performing, for each time segment, pitch enhancement processing on a signal derived from an input audio signal, the pitch enhancement method, implemented by a pitch enhancement apparatus that includes processing circuitry, comprising:
- a pitch enhancement step in which the processing circuitry performs, as the pitch enhancement processing,
- for a time segment judged to be a time segment including the signal that is a consonant, for each time of the time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, a predetermined constant B0, and a value that is greater than 0 and less than 1, and
- the signal at the time, and
- for a time segment judged to be a time segment including the signal that is not a consonant, for each time of the time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, and a predetermined constant B0, and
- the signal at the time.
A pitch enhancement method for obtaining an output signal by performing, for each time segment, pitch enhancement processing on a signal derived from an input audio signal, the pitch enhancement method, implemented by a pitch enhancement apparatus that includes processing circuitry, comprising:
- a pitch enhancement step in which the processing circuitry performs, as the pitch enhancement processing, for each time n of each time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time n by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, and a value that becomes smaller as the consonant-likeness of the time segment becomes higher, and
- the signal at the time n.
A pitch enhancement method for obtaining an output signal by performing, for each time segment, pitch enhancement processing on a signal derived from an input audio signal, the pitch enhancement method, implemented by a pitch enhancement apparatus that includes processing circuitry, comprising:
- a pitch enhancement step in which the processing circuitry performs, as the pitch enhancement processing,
- for a time segment judged to be a time segment including the signal that is a consonant or/and the signal whose spectral envelope is flat, for each time of the time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, a predetermined constant B0, and a value that is greater than 0 and less than 1, and
- the signal at the time, and
- for a time segment about which a judgment other than that described above has been made, for each time of the time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, and a predetermined constant B0, and
- the signal at the time.
A pitch enhancement method for obtaining an output signal by performing, for each time segment, pitch enhancement processing on a signal derived from an input audio signal, the pitch enhancement method, implemented by a pitch enhancement apparatus that includes processing circuitry, comprising:
- a pitch enhancement step in which the processing circuitry performs, as the pitch enhancement processing, for each time n of each time segment, processing to obtain, as an output signal, a signal including a signal obtained by adding
- a signal, which was obtained by multiplying the signal at a time that is an earlier time than the time n by the number of samples T0 corresponding to a pitch period of the time segment, pitch gain σ0 of the time segment, and a value that becomes smaller as the consonant-likeness of the time segment becomes higher and that becomes smaller as the flatness of a spectral envelope of the time segment becomes higher, and
- the signal at the time n.
(canceled)
Dependencies are inferred from the claim text.