US 12,123,766 B2
Signal processing device, signal processing method, and program
Motoshi Takasu, Yokohama (JP); Toshifumi Kudo, Tokyo (JP); Yoshiyuki Hamaji, Yokohama (JP); and Takanori Kouou, Yokohama (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/762,462
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Sep. 25, 2020, PCT No. PCT/JP2020/036375
§ 371(c)(1), (2) Date Mar. 22, 2022,
PCT Pub. No. WO2021/060500, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-176601 (JP), filed on Sep. 27, 2019.
Prior Publication US 2022/0341772 A1, Oct. 27, 2022
Int. Cl. G01H 3/00 (2006.01); G01H 3/08 (2006.01); G10L 19/02 (2013.01); G10L 25/18 (2013.01); G10L 25/21 (2013.01); H04R 3/00 (2006.01)
CPC G01H 3/08 (2013.01) [G10L 19/0204 (2013.01); G10L 25/18 (2013.01); G10L 25/21 (2013.01); H04R 3/005 (2013.01); H04R 2410/01 (2013.01); H04R 2430/21 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A signal processing device comprising:
an acquisition unit that acquires an acoustic signal;
a measurement unit that measures an acoustic level of the acoustic signal for each of first frequency bands, which are a plurality of frequency bands related to a first bandwidth set in advance;
a calculation unit that specifies an acoustic feature quantity that indicates a degree of deviation from a normal value, of an acoustic level related to each of second frequency bands, which are a plurality of frequency bands related to a second bandwidth wider than the first bandwidth, based on a plurality of acoustic levels related to the first frequency bands;
a first determination unit that determines whether or not the acoustic level measured for each of the first frequency bands is equal to or higher than a first threshold value; and
a second determination unit that determines whether or not the acoustic feature quantity is equal to or larger than a second threshold value.