US 12,219,330 B2
Sound output device
Chikara Yamamoto, Anjo (JP)
Assigned to DENSO ELECTRONICS CORPORATION, Anjo (JP)
Filed by DENSO ELECTRONICS CORPORATION, Anjo (JP)
Filed on Jun. 8, 2022, as Appl. No. 17/835,708.
Application 17/835,708 is a continuation of application No. PCT/JP2020/045101, filed on Dec. 3, 2020.
Claims priority of application No. 2019-235154 (JP), filed on Dec. 25, 2019.
Prior Publication US 2022/0303679 A1, Sep. 22, 2022
Int. Cl. H04R 3/04 (2006.01); B60Q 5/00 (2006.01); H04R 1/28 (2006.01)
CPC H04R 3/04 (2013.01) [B60Q 5/008 (2013.01); H04R 1/2803 (2013.01); H04R 2499/15 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A sound output device comprising:
a waveform output unit configured to
acquire information relative to a traveling state of a vehicle from an external sensor,
determine whether the vehicle is traveling at a speed lower than a predetermined speed based on the information relative to the traveling state,
in response to determining that the vehicle is traveling at the speed lower than the predetermined speed, determine a center frequency within an audible frequency band according to a frequency band in which a sound pressure is desired to be output as a notification sound for notifying approach of the vehicle, set a first waveform having the center frequency, widen a frequency of the first waveform by a frequency modulation to generate a second waveform having a frequency within the audible frequency band, and output a sound data indicating a sound waveform including the second waveform; and
a sounding body configured to receive a voltage or a current corresponding to the sound data, and generate a sound corresponding to the voltage or the current as the notification sound.