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Sound wave generator

A sound wave generator and loudspeaker technology, which is applied in the direction of sound-emitting devices, instruments, and vehicle safety arrangements, and can solve problems such as difficulty in using large speakers, difficulty in using large speakers with woofers, difficulty in including low-pitched sounds, etc.

Inactive Publication Date: 2012-08-01
DENSO CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In fact, due to loading limitations, it is difficult to adopt a large speaker such as a woofer as a speaker for sending notification sounds to an external area of ​​the vehicle
On the other hand, if a small speaker (micro speaker) is used to generate a pseudo engine sound, it is difficult to include a low-pitched sound having a frequency of 400 Hz or lower
That is, in the vehicle approach notification device, it is difficult to adopt a large speaker due to the limitation of loading, and thus it is difficult to generate a notification sound including a low-pitched sound.

Method used

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Examples

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no. 1 example

[0025] will refer to Figure 1-4B The first embodiment will be described.

[0026] The vehicle approach notification device is typically equipped in a vehicle driven by an electric motor and running quietly. For example, vehicle approach notification devices are equipped in electric vehicles, hybrid vehicles, and the like. Depending on driving conditions or when a sensor detects a person such as a pedestrian, the vehicle approach notification device emits a notification sound to an area outside the vehicle, thereby notifying the periphery of the vehicle of the presence of the vehicle.

[0027] Such as image 3 As shown, the vehicle approach notification device includes a vehicular horn 2 serving as a dynamic speaker and a speaker control circuit 4 for controlling the operation of the vehicular horn 2 .

[0028] (Description of car horn 2)

[0029] The vehicle horn 2 is an electromagnetic alarm sound generating device that emits an alarm sound to an area outside the vehicle...

no. 2 example

[0069] will refer to Figure 5 and 6 The second embodiment will be described. Hereinafter, similar components are designated by similar reference numerals.

[0070] As an example of a dynamic speaker, similarly to the first embodiment, the car horn 2 generates an alarm sound having a fundamental tone of 500 Hz. Thus, it is difficult to generate a low pitch (250 Hz) lower than the fundamental tone.

[0071] Therefore, in general techniques, for example, to generate a sound whose average melody is "do" as an example of notification sound, frequencies equal to or higher than 500 Hz (that is, 500 Hz, 1 kHz, 2 kHz, and 4 kHz) generated by the car horn 2 are used. A frequency signal that includes a "do" frequency, such as Figure 5 Shown in the comparative example in (a).

[0072] In this embodiment, on the other hand, the target generation frequency is provided as "250 Hz" ("do" sound in an octave lower than 500 Hz) as an example of A Hz. Therefore, if Figure 5 As shown in ...

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Abstract

A sound wave generator includes a speaker control circuit (4) and a speaker (2). The speaker control circuit includes a signal generating unit (3) that is configured to generate an electric signal having a humming frequency property. The humming frequency property includes a plurality of frequencies that have an overtone relationship with respect to A Hz and are pitched at the A Hz, the A Hz being a target generation frequency and corresponding to a low pitch frequency in an audible range. The speaker (2) generates a sound wave from the electric signal by applying the electric signal to a vibration plate (1) that produces the sound wave.

Description

technical field [0001] The present invention relates to a sound wave generator. Background technique [0002] Typically, speakers with large diaphragms, such as woofers, are used to generate low pitch sound. However, it is difficult to adopt such a loudspeaker with a large diaphragm if there is any limitation on loading and cost. On the other hand, in a sound wave generator having a small speaker (microspeaker), it is difficult to generate low-pitched sound. Therefore, only sounds with lower pitch tones are generated. [0003] For example, an acoustic wave generator is used in a vehicle approach notification device for notifying the presence of a vehicle with a quiet running sound, such as an electric vehicle, a fuel cell vehicle, and a hybrid vehicle. As an example, the above-mentioned disadvantages will be explained with respect to a case where a vehicle approaching a notification device that generates a notification sound to notify a person such as a pedestrian of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/18
CPCH04R2499/13H04R3/04B06B2201/70B60R21/00B06B2201/53B06B1/0276
Inventor 中山利明林俊男樱井公二
Owner DENSO CORP
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