US 12,069,448 B2
Frequency characteristics converting apparatus, method and program for the same
Kazunori Kobayashi, Tokyo (JP); and Shoichiro Saito, Tokyo (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/600,057
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Mar. 23, 2020, PCT No. PCT/JP2020/012575
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/203383, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-071876 (JP), filed on Apr. 4, 2019.
Prior Publication US 2022/0191614 A1, Jun. 16, 2022
Int. Cl. H04R 3/02 (2006.01); B60Q 9/00 (2006.01); G06F 3/16 (2006.01); H04R 1/02 (2006.01); H04R 29/00 (2006.01)
CPC H04R 3/02 (2013.01) [B60Q 9/00 (2013.01); G06F 3/165 (2013.01); H04R 1/025 (2013.01); H04R 29/001 (2013.01); H04R 2430/01 (2013.01); H04R 2499/13 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A frequency characteristics converting apparatus comprising processing circuitry configured to, in response to an increase in magnitude of noise at a first position in a vehicle, increase volume of a target sound in emitting the target sound by a sound emitter and increase a degree of a signal processing applied to the target sound, the sound emitter being located at the first position, the target sound being collected by a sound collector installed at a second position, wherein the signal processing includes concurrent processing of preventing howling of the target sound and equalizing frequency characteristics of the target sound from the sound collector and to the sound emitter.