The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 31, 2024
Filed:
Jun. 04, 2020
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Kazunori Kobayashi, Tokyo, JP;
Ryotaro Sato, Tokyo, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
Provided is a technique to generate a call environment that prevents call contents from being heard by a person other than a person speaking on the phone in a case where call voice is output from a speaker. Speakers installed in an automobile are denoted by SP, . . . , SP, a first filter coefficient used to generate an input signal for a speaker SPis denoted by F(ω), and a second filter coefficient that is different from the first filter coefficient and is used to generate an input signal for the speaker SPis denoted by {tilde over ( )}F(ω). A call environment generation method includes: an acoustic signal generation step of generating, when detecting a start signal of a call, a call-time acoustic signal that is obtained by adjusting volume of an acoustic signal to be reproduced during the call, by using a predetermined volume value; a first local signal generation step of generating a sound signal Sas an input signal for the speaker SPfrom a voice signal of the call by using the first filter coefficient F(ω); and a second local signal generation step of generating an acoustic signal Aas an input signal for the speaker SPfrom the call-time acoustic signal by using the second filter coefficient {tilde over ( )}F(ω).