SOUND DETERMINATION DEVICE, SOUND DETECTION DEVICE, AND SOUND DETERMINATION METHOD
First Claim
1. A sound determination device, comprising:
- a frequency analysis unit configured to receive a mixed sound including a to-be-extracted sound and a noise, and to obtain a frequency signal of the mixed sound for each of a plurality of times included in a predetermined duration; and
a to-be-extracted sound determination unit configured to determine, when the number of the frequency signals at the plurality of times included in the predetermined duration is equal to or larger than a first threshold value and a phase distance between the frequency signals out of the frequency signals at the plurality of times is equal to or smaller than a second threshold value, each of the frequency signals with the phase distance as a frequency signal of the to-be-extracted sound,wherein the phase distance is a distance between phases of the frequency signals when a phase of a frequency signal at a time t is ψ
(t) (radian) and the phase is represented by ψ
′
(t)=mod 2π
(ψ
(t)−
2π
ft) (where f is an analysis-target frequency).
3 Assignments
0 Petitions
Accused Products
Abstract
A sound determination device (100) includes: an FFT unit (2402) which receives a mixed sound including a to-be-extracted sound and a noise, and obtains a frequency signal of the mixed sound for each of a plurality of times included in a predetermined duration; and a to-be-extracted sound determination unit (101 (j)) which determines, when the number of the frequency signals at the plurality of times included in the predetermined duration is equal to or larger than a first threshold value and a phase distance between the frequency signals out of the frequency signals at the plurality of times is equal to or smaller than a second threshold value, each of the frequency signals with the phase distance as a frequency signal of the to-be-extracted sound. The phase distance is a distance between phases of the frequency signals when a phase of a frequency signal at a time t is ψ(t) (radian) and the phase is represented by ψ′(t)=mod 2π(ψ(t)−2πft) (where f is an analysis-target frequency).
74 Citations
10 Claims
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1. A sound determination device, comprising:
-
a frequency analysis unit configured to receive a mixed sound including a to-be-extracted sound and a noise, and to obtain a frequency signal of the mixed sound for each of a plurality of times included in a predetermined duration; and a to-be-extracted sound determination unit configured to determine, when the number of the frequency signals at the plurality of times included in the predetermined duration is equal to or larger than a first threshold value and a phase distance between the frequency signals out of the frequency signals at the plurality of times is equal to or smaller than a second threshold value, each of the frequency signals with the phase distance as a frequency signal of the to-be-extracted sound, wherein the phase distance is a distance between phases of the frequency signals when a phase of a frequency signal at a time t is ψ
(t) (radian) and the phase is represented by ψ
′
(t)=mod 2π
(ψ
(t)−
2π
ft) (where f is an analysis-target frequency). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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-
9. A sound determination method, comprising:
-
receiving a mixed sound including a to-be-extracted sound and a noise and obtaining a frequency signal of the mixed sound for each of a plurality of times included in a predetermined duration; and determining, when the number of the frequency signals at the plurality of times included in the predetermined duration is equal to or larger than a first threshold value and a phase distance between the frequency signals out of the frequency signals at the plurality of times is equal to or smaller than a second threshold value, each of the frequency signals with the phase distance as a frequency signal of the to-be-extracted sound, wherein the phase distance is a distance between phases of the frequency signals when a phase of a frequency signal at a time t is ψ
(t) (radian) and the phase is represented by ψ
′
(t)=mod 2π
(ψ
(t)−
2π
ft) (where f is an analysis-target frequency).
-
-
10. A sound determination program causing a computer to execute:
-
receiving a mixed sound including a to-be-extracted sound and a noise and obtaining a frequency signal of the mixed sound for each of a plurality of times included in a predetermined duration; and determining, when the number of the frequency signals at the plurality of times included in the predetermined duration is equal to or larger than a first threshold value and a phase distance between the frequency signals out of the frequency signals at the plurality of times is equal to or smaller than a second threshold value, each of the frequency signals with the phase distance as a frequency signal of the to-be-extracted sound, wherein the phase distance is a distance between phases of the frequency signals when a phase of a frequency signal at a time t is ψ
(t) (radian) and the phase is represented by ψ
′
(t)=mod 2π
(ψ
(t)−
2π
ft) (where f is an analysis-target frequency).
-
Specification