Sound propagation characteristics correction apparatus, sound propagation characteristics correction method, and program

Patent metadata

Field	Value
Publication number	US-2026032402-A1
Application number	US-202218997283-A
Country	US
Kind code	A1
Filing date	Jul 28, 2022
Priority date	Jul 28, 2022
Publication date	Jan 29, 2026
Grant date	—

Abstract

A sound propagation characteristics correction apparatus includes: a pseudo inverse filter generation unit that generates a pseudo inverse filter by a function that smooths sound propagation characteristics from a speaker driver of a wearable open-ear speaker to an ear canal entrance; and an acoustic signal correction unit that corrects an acoustic signal on the basis of the pseudo inverse filter and transmits the corrected acoustic signal to the wearable open-ear speaker.

First claim

1 . A sound propagation characteristics correction apparatus comprising:
processing circuitry configured to generate a pseudo inverse filter by a function that smooths sound propagation characteristics from a speaker driver of a wearable open-ear speaker to an ear canal entrance; and correct an acoustic signal on a basis of the pseudo inverse filter and transmits the corrected acoustic signal to the wearable open-ear speaker.

2 . The sound propagation characteristics correction apparatus according to claim 1 , the processing circuitry configured to generate a kernel ridge pseudo inverse filter that is a pseudo inverse filter using kernel ridge regression.

3 . The sound propagation characteristics correction apparatus according to claim 1 , the processing circuitry configured to
generate a mollifier pseudo inverse filter that is a pseudo inverse filter using a mollifier.

4 . The sound propagation characteristics correction apparatus according to claim 1 , the processing circuitry configured to take a moving average of the sound propagation characteristics, and generates a low-pass ensuring pseudo inverse filter that is a pseudo inverse filter that ensures passage of a low frequency range of an inverse filter capable of designating strength of regularization for each frequency.

5 . The sound propagation characteristics correction apparatus according to claim 4 ,
the processing circuitry configured to generate low-pass filter-processed sound propagation characteristics obtained by applying a low-pass filter to sound propagation characteristics after a moving average, and band-pass filter-processed sound propagation characteristics obtained by applying a band-pass filter, generate an inverse filter capable of designating strength of regularization for each frequency from the band-pass filter-processed sound propagation characteristics, multiply the low-pass filter-processed sound propagation characteristics by a constant so that a value of a high-pass end point of the low-pass filter-processed sound propagation characteristics matches a value of a low-pass end point of the band-pass filter-processed sound propagation characteristics, and generate the low-pass ensuring pseudo inverse filter by combining an inverse filter generated from the band-pass filter-processed sound propagation characteristics with the low-pass filter-processed sound propagation characteristics multiplied by the constant.

6 . A sound propagation characteristics correction method executed by a sound propagation characteristics correction apparatus, the sound propagation characteristics correction method comprising:
generating a pseudo inverse filter by a function that smooths sound propagation characteristics from a speaker driver of a wearable open-ear speaker to an ear canal entrance; and correcting an acoustic signal on a basis of the pseudo inverse filter and transmitting the corrected acoustic signal to the wearable open-ear speaker.

7 . A non-transitory computer readable medium storing a computer program for causing a computer to function as the sound propagation characteristics correction apparatus according to claim 1 .

Assignees

• Nippon Telegraph & Telephone

Inventors

• Kozuka Shihori
• Ito Hiroaki
• Noguchi Kenichi
• Kako Tatsuya
• Chiba Hironobu

Classifications

• H04S2420/07

  Synergistic effects of band splitting and sub-band processing · CPC title

• H04R2430/03

  Synergistic effects of band splitting and sub-band processing · CPC title

• H04R5/04

  Circuit arrangements, {e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments (combinations of amplifiers H03F3/68; stereophonic systems H04S)} · CPC title

• H04R5/033

  Headphones for stereophonic communication {(details thereof, e.g. relating to batteries, cables or control elements H04R1/10)} · CPC title

• H04R3/04

  for correcting frequency response · CPC title