US 12,248,550 B2
Detection of attachment problem of apparatus being worn by user
Takayuki Arakawa, Tokyo (JP); and Takafumi Koshinaka, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on Oct. 6, 2023, as Appl. No. 18/482,245.
Application 18/482,245 is a continuation of application No. 18/070,875, filed on Nov. 29, 2022, granted, now 11,977,617.
Application 18/070,875 is a continuation of application No. 16/325,849, granted, now 11,537,695, issued on Dec. 27, 2022, previously published as PCT/JP2017/028531, filed on Aug. 7, 2017.
Claims priority of application No. 2016-161413 (JP), filed on Aug. 19, 2016.
Prior Publication US 2024/0045938 A1, Feb. 8, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 21/32 (2013.01); A61B 5/1171 (2016.01); G06F 21/34 (2013.01); G10L 17/02 (2013.01); G10L 19/02 (2013.01); G10L 25/06 (2013.01); G10L 25/51 (2013.01); H04R 1/10 (2006.01); H04R 1/26 (2006.01); H04R 1/46 (2006.01); H04R 3/00 (2006.01)
CPC G06F 21/32 (2013.01) [A61B 5/1171 (2016.02); G06F 21/34 (2013.01); G10L 17/02 (2013.01); G10L 19/02 (2013.01); G10L 25/06 (2013.01); G10L 25/51 (2013.01); H04R 1/10 (2013.01); H04R 1/1041 (2013.01); H04R 1/1091 (2013.01); H04R 1/26 (2013.01); H04R 1/46 (2013.01); H04R 3/00 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A personal authentication device worn by a user to be authenticated, the personal authentication device comprising:
a memory storing instructions; and
at least one processor configured to execute the instructions to perform:
determining whether an acoustic characteristic of the user or a feature value extracted from the acoustic characteristic satisfies a predetermined condition in accordance with an attachment trouble rule; and
detecting that there is an attachment trouble of the personal authentication device when the acoustic characteristic or the feature value satisfies a predetermined attachment trouble rule, wherein
the attachment trouble rule includes
(i) sound pressure at natural vibration wavelength corresponding to a distance between an earphone and an eardrum of the user is a constant multiple or half of a predetermined reference, or
(ii) maximum peak value of sound pressure within a frequency band corresponding to the distance between the earphone and the eardrum of the user is a constant multiple or half of a predetermined reference, and the maximum peak value of sound pressure is higher than two adjacent peaks within the frequency band corresponding to the distance from the earphone to the eardrum of the user.