JP2002004128A - Helmet with loudspeaker unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a helmet with loudspeaker unit improved in vocal quality by suppressing howling. SOLUTION: The subject loudspeaker unit 2 set up in the front of the helmet 1 has a speaker housing 21 situated on the visor 3a of a headgear body 4 and a wrapping band 3 connected to both ends of the speaker housing 21; wherein the speaker housing 21 is held on the headgear body 4 by winding the band 3 about the outer circumferential surface of the rim of the headgear body 4 and closed except the front opening 28 while holding a speaker 2 inside the housing 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a microphone,
The present invention relates to a helmet with a loudspeaker in which a loudspeaker such as a speaker is attached to a helmet cap.

[0002]

2. Description of the Related Art In general, a loudspeaker is composed of a microphone, a speaker, an amplifier, a volume, a power supply, and the like. At the top of the
The microphone is placed near the mouth via the arm.

[0003]

However, the conventional helmet equipped with a loudspeaker has a problem in that the microphone picks up the sound of the loudspeaker and resonates to generate a high-frequency sound, which causes so-called howling which is uncomfortable.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a helmet equipped with a loudspeaker capable of improving howling by suppressing howling.

[0005]

A helmet with a loudspeaker according to the present invention for achieving the above object is provided with a speaker at the front of a cap of the helmet, and an arm of a microphone below the eaves of the cap. In the helmet equipped with a loudspeaker which is held so as to be adjustable in position, an opening is provided only in front of a case accommodating the speaker, and the other part of the case is sealed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiment. FIG. 1 is a perspective view of the embodiment, in which a speaker 2 of a loudspeaker 1 is arranged above a protruding portion 4 a of a cap 4 of a helmet 3 via a case 5. An outer band 6 is connected to the end of the case 5, and the outer band 6 is wound around the outer peripheral surface of the cap 4, thereby supporting the case 5 so as not to move with respect to the cap 4. . The displacement of the outer band 6 toward the top 4b of the cap 4 is prevented by, for example, a plurality of displacement prevention members 7. A wearing body (not shown) that supports the hat body 4 so as not to move with respect to the head is attached to the inside of the cap body 4, and ear cords 8 are connected to left and right of the wearing body. String 9
Are connected by

The microphone 10 of the loudspeaker 1 is supported at one end of the case 5 via an arm 11 and an angle adjusting means 12, and the speaker 2 and the microphone 10 are connected via a cable 13 to an amplifier (not shown) and a volume of the loudspeaker 1. , And a power supply.

Here, as shown in the partial sectional view of FIG.
The case 5 is provided with a speaker housing chamber 21 for housing the speaker 2. The speaker accommodation room 21 includes a front plate 22, a rear plate 23, a top plate 24, a bottom plate 25, a left plate 26,
An opening 28 is formed in the front plate 22 in front of the speaker 2, and the other parts are closed.

FIG. 3 is a graph showing a volume (electrical resistance) opening for generating howling for different shapes of the speaker accommodating chamber 21. Type A is a speaker accommodating chamber without the bottom plate 25. Side plates 26, 27
, The type C shows the speaker accommodation room with the top plate 24 omitted, and the type D shows the speaker accommodation room 21 with the shape of the present embodiment. As can be seen from this graph, when the speaker accommodating chamber 21 having the shape of the present embodiment is used, the volume opening that generates howling, that is, the sound pressure can be maximized.

FIG. 4 is a graph showing the degree of opening of the volume of the microphone 10 which causes howling with respect to different directivities.
Denotes an omnidirectional microphone, and type G denotes the microphone 10 of the present embodiment. As this graph diagram shows,
When the bidirectional microphone 10 having the shape of the present embodiment is used, the volume opening for generating howling, that is, the sound pressure can be maximized. This is because the sound sensitivity characteristics of the bidirectional microphone are large in the front-back direction and small in the vertical direction, so that it is difficult to pick up the sound pressure of the speaker 2 above.

As described above, in the present embodiment, the speaker 2
Only the front of the microphone is open to the outside and the microphone 1
Since bidirectionality is given to 5, it is possible to increase the volume opening at which the howling is generated, and suppress the howling to improve the sound quality.

Further, if a cylindrical guide for guiding sound pressure forward is formed inside the opening 28 of the speaker accommodating chamber 21, howling can be further reduced.

[0013]

As described above, in the helmet with a loudspeaker according to the present invention, the opening is provided only in front of the speaker case. Therefore, even if the microphone is arranged near the mouth, the sound pressure is changed from the speaker to the microphone. Return is reduced. Therefore, even if the volume is increased, the occurrence of howling can be suppressed, and the sound quality can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a partial cross-sectional view of the loudspeaker.

FIG. 3 is a graph of a volume opening that causes howling for speaker housings of different shapes.

FIG. 4 is a graph of a volume opening that causes howling for microphones having different directivities.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loudspeaker 2 Speaker 3 Helmet 4 Cap body 5 Case 6 Outer band 10 Microphone 21 Speaker accommodation room 22 Front plate 23 Rear plate 24 Top plate 25 Bottom plate 26, 27 Side plate 28 Opening

Claims (3)

[Claims] 1. A helmet equipped with a loudspeaker in which a helmet is provided with a speaker at a front portion of a cap and a microphone is held below an eaves portion of the helmet by an arm so as to be adjustable in position, in front of a case accommodating the speaker. A helmet with a loudspeaker, characterized in that only the opening is provided and the other part of the case is sealed. 2. The helmet with a loudspeaker according to claim 1, wherein the sound pressure of the speaker is not input to the microphone. 3. The helmet with a loudspeaker according to claim 2, wherein the microphone has a bidirectional characteristic and has low sensitivity to sound pressure from above.