Patent ID: 11894013
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC G  H  B | IPC B  G  H

Claim 2:
3. An acoustic signal processing method using an acoustic signal processing apparatus that includes processing circuitry and is installed in a vehicle,
wherein at least a sound pickup position and a sound amplification position are assumed to be present in the vehicle,
the method comprising:
a control step of the processing circuitry performing control such that (i) when an opening portion of the vehicle is closed by opening and closing means disposed at the opening portion, an acoustic signal based on a sound pickup signal obtained from a microphone that collects sound emitted from the sound pickup position is played back from a speaker at the sound amplification position, and (ii) when the opening portion is open, the acoustic signal is not played back from the speaker to stop a sound amplification function in order to prevent propagating unintended sound.