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DESCRIPTION JP2006042021

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DESCRIPTION JP2006042021
PROBLEM TO BE SOLVED: To provide a compact and easy-to-handle helmet speaker that can
listen to sound even in a noisy environment. SOLUTION: An electric signal obtained from a sound
source is converted into vibration energy to vibrate the movable device 3, and the vibration is
conducted to a helmet structure so that sound waves are emitted from the structure. At this time,
the signal amplification device 5 takes in an external sound, generates a signal having a phase
opposite to that of the taken-in external sound, cancels the influence of the external sound,
cancels the influence from the sound source, synthesizes it with voice and drives the movable
device 3 Do. [Selected figure] Figure 1
Helmet speaker
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
helmet speaker suitable for use in listening to voices in a noisy environment such as riding on a
motorcycle or at a construction site.
[0002]
When riding on a motorcycle, etc., or at a construction site, a site of a plant factory, etc., it is
mandatory to wear a helmet for safety.
By the way, in order to listen to the sound generated from the communication device or the audio
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device while wearing the helmet, wear an earphone etc. on the ear, cover it with a helmet from
above, or modify the interior of the helmet and hit the ear The speaker was attached to the
position.
[0003]
On the other hand, muffled headphones to which the principle of noise canceling is applied
appear (for example, refer to non-patent document 1), and those to which this is applied to a
helmet are also proposed (for example, refer to patent document 1). According to the techniques
disclosed in these documents, the built-in microphone spreads the ambient noise and produces
and outputs an anti-phase sound that acts in the opposite direction to the noise, so that the two
sounds cancel each other and the ambient noise Noise can be reduced (Non-Patent Document 1),
or a local silent area can be formed at the ear of a worker wearing a helmet (Patent Document 1).
"Headphone noise canceller" <Internet URL: http // niigata-jp. Nett / Tokyo // hannbai / noisec /
noisec. Html> (searched on June 26, 2004) JP-A-5-279903 (paragraph 0006) ", Figure 1)
[0004]
When the above-mentioned "earphone wearing" or "remodeling helmet" becomes necessary,
wearing of the helmet becomes necessary and intercepts the sound from the outside, or
depending on the individual difference, it can not be heard well depending on the position of the
ear There was such a problem. Moreover, in order to eliminate this, it is conceivable to mount the
bone conduction device at a position where it can be in contact with the human body, but in this
case, it was difficult to mount the full helmet. In addition, the helmet needs to be drilled, which
may reduce the strength or violate the legal regulations that accompany it. On the other hand,
according to the technology disclosed in Patent Document 1, although it is possible to improve
the noise environment in the vicinity of the worker, there is a problem that a closed speaker is
required.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the abovementioned circumstances, and it is an object of the present invention to provide a compact and
easy-to-handle helmet speaker which can listen to sound even in a noisy environment.
[0006]
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In order to solve the above-described problems, the helmet speaker according to the present
invention includes a sound source, and a movable device that converts an electrical signal
obtained from the sound source into vibration energy and vibrates at least a part of the helmet
structure. It is characterized by being equipped.
[0007]
Further, in the present invention, the movable device propagates the vibration with respect to the
helmet structure in a state where the vibration is in contact with one side and a pressure is
applied to the shock absorbing material absorbing the vibration from the other side. And sound
waves are emitted from the structure.
[0008]
Further, in the present invention, a signal amplification that amplifies an electrical signal
obtained from the sound source to a voltage level necessary to drive an electromagnetic coil or a
piezoelectric element constituting the movable device and converts it to a frequency suitable for
reproduction. And a device.
[0009]
Further, in the present invention, the signal amplification device is characterized in that the
sound outside the helmet structure is taken in and converted into an electric signal, and the
electric signal is inverted and amplified to be converted into a frequency suitable for the
reproduction. .
[0010]
Furthermore, the present invention is characterized by comprising a signal combining circuit that
combines the output of the signal amplification device and the electrical signal obtained from the
sound source and supplies the combined signal to the movable device.
[0011]
According to the present invention, a compact helmet speaker is obtained by converting an
electric signal obtained from a sound source into vibration energy, vibrating the movable device,
conducting vibration to the helmet structure, and emitting sound waves from the structure. Can
be provided.
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Also, at this time, the signal amplification device takes in the external sound, generates a signal of
the opposite phase to the taken-in external sound, cancels the influence of the external sound,
cancels the influence by the external sound, synthesizes it with the voice, and outputs it to the
movable device. By driving, noise such as wind noise and noise in the factory can be removed,
and in local space in the helmet, it is possible to facilitate the listening of the voice under the
noise environment.
[0012]
FIG. 1 is a diagram referred to in order to explain a schematic structure of a helmet speaker
according to an embodiment of the present invention.
[0013]
In FIG. 1, reference numeral 1 denotes a helmet, and in this case, a driver or an operator wears
the head.
Here, the frame 2 is attached to the outer shell of the helmet 1, and in this frame 2, the movable
device 3 configured with an electromagnetic coil or a piezoelectric element contacts one side
with the helmet etc. and buffers the other side. It is attached via the material (spring / cushion 4).
As described later, the movable device 3 has a role as a vibrating portion that converts an electric
signal generated by a sound source into vibration energy and vibrates the helmet 1 (b in the
drawing).
At this time, the shock absorbing material (spring / cushion 4) absorbs the vibration and vibrates
the helmet 1 by bringing the opposite side of the movable device 3 into contact with the helmet
1 in a state where pressure is appropriately applied by the spring and cushion components. The
vibration of the helmet can be transmitted as a sound wave in the space inside the helmet 1 (a in
the figure), and the driver or worker wearing the helmet 1 can listen to the intended sound.
[0014]
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The movable device 3 is driven by the signal amplification device 5.
The signal amplification device 5 is supplied with, for example, an audio signal serving as a
sound source, and the audio signal is amplified to a voltage level necessary to drive an
electromagnetic coil or a piezoelectric element constituting the movable device 3. , Convert to a
frequency suitable for playback.
An example of the internal circuit configuration is shown in FIG. 3 and FIG.
[0015]
The signal amplification device 5 shown in FIG. 3 includes a sensor such as a microphone that
takes in external sound and converts it into an electric signal, and a phase inversion amplification
and frequency characteristic adjustment circuit 51 that generates an opposite phase signal by
inverting and amplifying the electric signal. It consists of
In FIG. 3, the wind noise and noise in the factory are canceled by the signal of the opposite phase
generated by the phase inversion amplification and frequency characteristic adjustment circuit
51, and the movable device 3 is driven by the signal from the sound source (not shown). can do.
As a result, the outer shell of the helmet 1 vibrates, and the driver or worker can listen to the
noise-reduced audio signal by the sound wave emitted through the helmet 1.
[0016]
At this time, depending on the audio signal from the sound source (not shown), the phase
inversion amplification and frequency characteristic adjustment circuit 51 can automatically
follow the frequency characteristic suitable for reproduction so as to be adjustable. Do.
[0017]
In FIG. 4, based on the signal amplification device 5 shown in FIG. 3, from the signal that has
been inverted and amplified and subjected to frequency characteristic adjustment, and from the
sound source amplified and amplified through the frequency adjustment circuit 52 and
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frequency characteristic adjusted. Are combined by the combination, amplification, and
frequency characteristic adjustment circuit 53 to drive the movable device 3.
According to the above-described configuration, it is possible to reduce external noise heard by
the driver or worker wearing the helmet 1 and to listen to the target audio signal more clearly.
[0018]
FIG. 2 is a diagram cited to explain the schematic structure of a helmet speaker according to
another embodiment of the present invention. The difference from the embodiment shown in FIG.
1 is that the outer shell (1a) of the helmet 1 is vibrated in FIG. 1, while the double structure
helmet is illustrated here so that the internal structure (1b) is vibrated. It's about doing it. For this
reason, the spring / cushion 4 is attached to the inside of the helmet shell 1a. The spring /
cushion 4 absorbs the vibration generated by the movable device 3 and brings the opposite side
of the movable device 3 into contact with the structure (1b) inside the helmet in a state where
pressure is appropriately applied by the spring and cushion components. The structure (1b)
inside the helmet can be vibrated. The vibration propagates the space inside the helmet as a
sound wave (a), and as in the embodiment shown in FIG. 1, the driver or worker wearing the
helmet 1 can listen to the target voice.
[0019]
As described above, according to the present invention, the electric signal obtained from the
sound source is converted into vibration energy to vibrate the movable device 3, and the
vibration is conducted to the helmet structure (the outer shell 1a or the inner side 1b). It emits
sound waves. At this time, the signal amplification device 5 takes in the external sound, generates
a signal having a phase opposite to that of the taken-in external sound, cancels the influence of
the external sound, cancels the influence from the sound source, synthesizes it with the voice,
and outputs the movable device 3 By driving, noise such as wind noise and noise in the factory
can be removed, and in local space in the helmet, listening of voice under noise environment is
facilitated. According to the above-described embodiment of the present invention, the vibration
target is the outer shell of the helmet or the internal structure in the dual structure helmet, but
may be a partial structure. Although the frequency characteristic adjustment has been described
as being performed automatically, a method may also be considered in which the user manually
performs the adjustment by volume adjustment of a remote control on hand.
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[0020]
It is the figure quoted in order to demonstrate the schematic structure of the speaker for helmets
concerning this invention embodiment. It is a figure quoted in order to explain the outline
structure of the speaker for helmets concerning other embodiments of the present invention. It is
a block diagram which shows the example of an internal structure of the signal amplification
apparatus shown to FIG. 1, FIG. It is a block diagram which shows the example of an internal
structure of the signal amplification apparatus shown to FIG. 1, FIG.
Explanation of sign
[0021]
DESCRIPTION OF SYMBOLS 1 ... Helmet (1a, 1b ... helmet structure), 2 ... Frame, 3 ... Movable, 4 ...
Spring / cushion, 5 ... Signal amplification apparatus, 51 ... Phase inversion amplification,
frequency characteristic adjustment circuit, 52 ... amplification, frequency Characteristic
adjustment circuit, 53 ... synthesis, amplification, frequency characteristic adjustment circuit,
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