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AssigneeNippon Telegraph and Telephone Corporation
InventorsKazunori Kobayashi, Ryotaro Sato
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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 SP1, . . . , SPN, a first filter coefficient used to generate an input signal for a speaker SPn is denoted by Fn(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 SPn is denoted by {tilde over ( )}Fn(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 Sn as an input signal for the speaker SPn from a voice signal of the call by using the first filter coefficient Fn(ω); and a second local signal generation step of generating an acoustic signal An as an input signal for the speaker SPn from the call-time acoustic signal by using the second filter coefficient {tilde over ( )}Fn(ω).
A call environment generation method comprising, when speakers installed in an acoustic space are denoted by SP1, . . . , SPN, and positions to specify a call place in the acoustic space are denoted by P1, . . . , PM:
A call environment generation method comprising, when speakers installed in an automobile are denoted by SP1, . . . , SPN, a position of a driver seat in the automobile is denoted by P1, positions of seats other than the driver seat in the automobile are denoted by P2, . . . , PM, a filter coefficient used to generate an input signal for a speaker SPn (hereinafter, referred to as first filter coefficient) is denoted by Fn(ω) (n=1, . . . , N, where ω is frequency), and a filter coefficient that is different from the first filter coefficient and is used to generate an input signal for the speaker SPn (hereinafter, referred to as second filter coefficient) is denoted by {tilde over ( )}Fn(ω) (n=1, . . . , N, where ω is frequency):
A call environment generation method comprising, when speakers installed in an acoustic space are denoted by SP1, . . . , SPN, positions to specify a call place in the acoustic space are denoted by P1, . . . , PM, a filter coefficient to generate an input signal for a speaker SPn (hereinafter, referred to as first filter coefficient) is denoted by Fn(ω) (n=1, . . . , N, where ω is frequency), and a filter coefficient that is different from the first filter coefficient and is used to generate an input signal for the speaker SPn (hereinafter, referred to as second filter coefficient) is denoted by {tilde over ( )}Fn(ω) (n=1, . . . , N, where ω is frequency):
A call environment generation apparatus comprising, when speakers installed in an automobile are denoted by SP1, . . . , SPN, a position of a driver seat in the automobile is denoted by P1, positions of seats other than the driver seat in the automobile are denoted by P2, . . . , PM, a filter coefficient used to generate an input signal for a speaker SPn (hereinafter, referred to as first filter coefficient) is denoted by Fn(ω) (n=1, . . . , N, where ω is frequency), and a filter coefficient that is different from the first filter coefficient and is used to generate an input signal for the speaker SPn (hereinafter, referred to as second filter coefficient) is denoted by {tilde over ( )}Fn(ω) (n=1, . . . , N, where ω is frequency):
Dependencies are inferred from the claim text.