JPH04357798A - Transmitter - Google Patents

Abstract

PURPOSE:To collect the voice of a speaker under noisy environment clearly and accurately by providing an vibration pickup converting a mechanical vibration in a hard part into an electric signal. CONSTITUTION:An vibration pickup is provided at the location connectable to a head part 2 in a helmet 3 as a head covering put on the head 2. An inner pad 7 is arranged so as to keep the space between the head 2 and the helmet 3 and protect the head 2. The inner pad 7 is made of, for example, light sponging agent such as styrene foam. In this case, the vibration pickup 1 is a converter converting the mechanical vibration into an electric signal, and used, for example, for an piezoelectric conversion element. Further, the vibration pickup 1 is installed on the hard part of the head part 2, which means the part directly connectable to the skeleton.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a telephone transmitter, and in particular,
The present invention relates to a transmitter suitable as a transmitting microphone for a wireless transmitter/receiver used in environments with extremely high noise levels such as automobile race tracks and construction sites.

0002

2. Description of the Related Art In automobile races, transceivers and the like are used for conversational communication between drivers and pitmen or directors during running. in this case,
The driver listens to the transmission from the pit through a small speaker, headphones, or earphones installed in the ear flaps installed in the helmet worn to protect the head, and listens to the transmission from the transmission microphone installed inside the helmet. You will be able to communicate your situation etc. However, the noise generated by a running racing car is higher than expected, reaching approximately 100 to 120 dB. Helmets cover the entire head and face, so they seem to have a sound-insulating effect, but at this level of noise, we can't expect much of that effect. In addition, regardless of the type of microphone, in general, microphones are designed to be used in low-noise environments and have a structure that converts air vibrations into electrical vibrations, so in high-noise environments the transmitted content is masked by external noise. The content that was originally intended to be transmitted will be lost.

0003

[Problems to be Solved by the Invention] As described above, since conventional microphones have a structure that exclusively collects sound waves, it is difficult to clearly collect the voice of a speaker under high noise conditions such as in a racing car. There was a problem that it was not possible to The above situation applies not only to automobile racetracks, but also to construction sites with high noise levels, engine rooms in ships, and the like.

[0004] An object of the present invention is to provide a transmitter that can reliably and clearly collect a speaker's voice under high noise conditions.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention according to claim 1 provides a mounting device that is attached to a human head, and a device that is capable of contacting a hard part of the head in the mounting device. a vibration pickup disposed at a position that converts mechanical vibration in the hard part into an electrical signal.

[0006] Furthermore, the invention according to claim 8 provides a mounting device to be attached to the head of a human body, a magnet piece to be attached to the head of the human body, and a position where the magnet piece is attached in the mounting device. and a vibration pickup arranged at a predetermined distance from the magnet piece to detect the magnetic field generated by the magnet piece and convert it into an electric signal.

[0007]

[Operation] According to the invention as claimed in claim 1, when the wearing device (for example, a helmet) is worn on the head of a human body, the vibration pickup attached to the predetermined position of the wearing device comes into contact with the hard part of the head. Then, the sound vibrations transmitted to the hard part are converted into electrical signals. In this way, instead of collecting sound waves caused by air vibrations, we collected solid vibrations (elastic vibrations) that propagate through the head, eliminating noise caused by air vibrations that exist in the surrounding environment. And only the voice can be collected clearly.

On the other hand, according to the invention as set forth in claim 8, when the wearing device (for example, a helmet) is attached to the head of a human body, the magnet piece attached to the head of the human body responds to the sound of the head. It vibrates mechanically due to the solid vibrations propagated to it. As a result, the magnetic field generated by the magnet pieces vibrates. In order to detect this magnetic field, a vibration pickup placed at a position of the wearing tool that does not contact the head and the magnet piece converts the vibration of the magnetic field into an electrical signal. In this way, the solid vibrations associated with the sound of the head can be collected in a non-contact manner through magnetic coupling, eliminating the noise of air vibrations existing in the surrounding environment without making direct contact with the head. And the voice can be collected clearly.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. (i) First Embodiment FIG. 1 shows an outline of a first embodiment of the present invention. As shown in FIG. 1, a vibration pickup 1 is provided in a helmet 3, which is a mounting tool worn on a head 2 of a human body, at a position where it can come into contact with the head 2. An inner pad 7 is provided on the inner surface of the helmet 3 to maintain a distance from the head 2 and protect the head. As the inner pad 7, for example, a lightweight foam material such as expanded polystyrene is used.

The vibration pickup 1 is a transducer that converts mechanical vibrations into electrical signals, and is constructed using, for example, a piezoelectric transducer element. The mounting position of the vibration pickup 1 is such that it can directly contact a hard part of the head 2, specifically, a bone part. In FIG. 1, an example is shown where it is placed on the top of the head 2. If sufficient contact is ensured at the head, it is possible to collect solid vibrations (elastic waves) corresponding to sound propagated through the bones of the head. However, when the vibration pickup 1 is placed on the helmet 3, it is preferably placed on the upper temporal region 4 or the lower temporal region 5, as shown in FIG. The reason for this is that the helmet 3 is generally made so as to press and pinch the temporal region of the head 2 as shown in FIG. As a result, the vibration pickup 1, which needs to be in close contact with the head 2, uses the pressing force of the helmet 3 to vibrate sound more effectively at the upper temporal region 4 or the lower temporal region 5 than at the top. This is because it is possible to collect

Next, an example of the fixing structure of the vibration pickup 1 is shown in FIG. As shown in FIG. 4, a recess 23 of an appropriate size is formed in the inner pad 7, and the vibration pickup 1 is housed in the recess. Vibration pickup 1
The vibration sensing surface of the pedestal 9 has a larger area than the sensing surface.
is installed. The reason for increasing the area of this pedestal 9 is to make it easier to collect more vibrations.
It works to improve sensitivity. The pedestal 9 is fixed to the opening end of the recess of the inner pad 7 via a cushioning material 8, and is fixed in an acoustically insulated state so that the vibration pickup 1 does not come into direct contact with the inner pad 7. Cushioning material 8
For example, a material with a large internal loss such as urethane foam or closed-cell polymer is preferable.

The joint between the base 9 and the inner pad 7 is preferably brought into intermittent contact as shown in FIG. That is, intermittent notches 11 are provided at the open end of the recess 23 of the inner pad 7, and the contact area is reduced as much as possible rather than contacting the base 9 over the entire opening of the recess 23. As a result, it is possible to reduce the mixing of disturbance noise component vibrations propagating to the pedestal 9 through the inner pad 7.

On the other hand, apart from providing the notches 11 intermittently to achieve acoustic insulation, as shown in FIG. The vibration pickup 1 may be supported with a net-like spring material 12 interposed therebetween. In this case, the noise and vibration components that are about to enter from the inner pad 7 are transmitted to the spring material 12.
5, the same effect as in FIG. 5 can be obtained.

FIG. 7 shows an example of another fixing structure for the vibration pickup 1. In this example, the recess 2 of the inner pad 7
A shield material 13 that acts as an acoustic low-pass filter is provided on the inner wall surface of the vibration pickup device 3, and the pedestal 9 and the vibration pickup 1 are fixed via the shield material 13 with a buffer support 14 such as urethane foam. The shielding material 13 is preferably made of a material that has a sufficiently higher mechanical impedance than the inner pad 7, that is, a material that is heavy and hard. For example, zinc, iron, etc. can be used. In this way, the heavy and hard shielding material 13
is not easily vibrated by unnecessary vibrations and acts as a low-pass filter. Therefore, noise vibrations are removed and only audio vibration components are collected through the pedestal 9, improving the S/N ratio.

FIG. 8 shows yet another example of a fixing structure for the vibration pickup 1. In this example, the base 9 is joined to the vibration shield ring 16 via the buffer support 17, and the vibration shield ring 16 is directly fixed to the helmet 3 via the buffer support 15. That is, the base 9 is separated from the inner pad 7 and is acoustically insulated. Urethane foam or the like is used for the buffer support 15 and the buffer support 17, and heavy zinc, iron, or the like is used for the vibration shield ring 16. By doing this, it is possible to prevent noise and vibration from entering, similar to FIG. 7.

FIG. 9 shows the lead wire 10 of the vibration pickup 1.
The wiring state inside the helmet 3 is shown. Lead wire 1
0 is wound around the vibration pickup 1. In this way, when the lead wire 10 is wound, the amount of noise and vibration that enters through the lead wire 10 can be reduced compared to when the lead wire 10 is wired in a straight line. That is, when the lead wire 10 is wired in a straight line, the lead wire 1
Lead wire 1 tends to vibrate due to noise and vibration, but lead wire 1
By bypassing 0, the effect of vibration impact is obtained. Also,
The wiring state of the lead wire 10 is not limited to the embodiment shown in FIG. It may be made to meander as shown in FIG.

(ii) Second Embodiment FIG. 11 shows a second embodiment of the present invention. This second embodiment is characterized in that the sound vibrations of the head 2 are not collected directly from the head 2, but are collected indirectly using magnetic coupling. As shown in FIG. 11, a vibration pickup 24 consisting of a magnetic detector is provided at a suitable portion of the head 2, for example, at a position corresponding to the upper temporal region 4 or the lower temporal region 5 in FIG. The vibration pickup 24 includes a yoke 18 provided within a buffer support 17 such as urethane foam fixed to the inner pad 7, and a pickup coil 20 wound around a center piece 19 of the yoke 18. However, the tip end surface of the vibration pickup 24 is located inside the open end of the recess 23, that is, the inner wall surface of the inner pad 7, and is fixed at an appropriate distance so as not to come into direct contact with the head 2.

In use, the helmet 3 is worn with the magnetic piece 22 attached to the head 2 corresponding to the vibration pickup 24. At this time, the magnetic piece 22 and the vibration pickup 24 face each other. Then, the magnetic piece 22 vibrates due to the solid vibration accompanying the utterance of the voice. When the magnetic piece 22 vibrates, the induced voltage induced in the pickup coil 20 oscillates due to a change in the intensity of the magnetic field generated by the magnetic piece 22, and is extracted to the lead wire 10 as a voltage change. This change in voltage corresponds to solid vibration accompanying sound, so it becomes possible to collect sound indirectly.

[0019] In this way, since the sound can be collected indirectly, it is not affected much by the wearing condition of the helmet.
Furthermore, it is possible to reliably and clearly collect and transmit voices without being affected by noise and vibrations that enter through the inner pad 7.

[0020]

As described above, according to the present invention, since solid vibrations are collected, the voice of the speaker can be collected reliably and clearly in a high-noise environment without collecting noise.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the arrangement position of a vibration pickup.

FIG. 3 is an explanatory diagram of the pressed state of the helmet.

FIG. 4 is a sectional view showing the fixing structure of the vibration pickup.

FIG. 5 is a sectional view taken along line AA in FIG. 4 showing the pickup fixing structure.

FIG. 6 is a sectional view showing another fixing structure of the pickup.

FIG. 7 is a sectional view showing another fixing structure of the pickup.

FIG. 8 is a sectional view showing another fixing structure of the pickup.

FIG. 9 is a plan view showing the wiring state of the lead wires of the pickup.

FIG. 10 is a plan view showing another wiring state of the lead wires of the pickup.

FIG. 11 is a sectional view showing a vibration pickup structure according to a second embodiment.

[Explanation of symbols]

1...Vibration pickup 2...Head 3...Helmet 4... Upper temporal region 5...Lower temporal region 6...Ears 7...Inner pad 8...Buffer material 9...Pedestal 10...Lead wire 11...Notch 12...Spring material 13...Shield material 14...Buffer support 15...Buffer support 16...Vibration shield ring 17...Buffer support 18...Yoke 19...Centerpiece 20...Pickup coil 21...Face mask 22...Magnetic piece 23...Concavity 24...Vibration pickup

Claims (8)

[Claims] 1. A mounting device that is attached to a human head, and a vibration device that is arranged in a position where it can come into contact with a hard part of the head in the mounting tool, and that converts mechanical vibrations in the hard part into electrical signals. A transmitter characterized by being equipped with a pickup. 2. The transmitter according to claim 1, wherein the vibration pickup is arranged at a position corresponding to the temporal region of the human head. 3. The transmitter according to claim 1, wherein the vibration pickup is attached to a mounting tool via a vibration damping material. 4. The transmitter according to claim 1, 2 or 3, wherein a pedestal having an area larger than the area of the vibration detection surface of the vibration pickup is attached to the vibration detection surface of the vibration pickup. Transmitter. 5. The transmitter according to claim 1, 2, 3, or 4, wherein the vibration pickup is attached to the attachment tool intermittently in contact with the vibration pickup. 6. The transmitter according to claim 1, wherein a lead wire for deriving an electrical output signal is connected to the vibration pickup, and the lead wire has a meandering shape. Alternatively, a transmitter characterized in that it is wound and wired inside a mounting device. 7. The transmitter according to claim 1, wherein a plurality of said vibration pickups are provided at different positions. 8. A mounting device to be attached to the head of a human body, a magnet piece affixed to the head of the human body, and a predetermined distance from the magnet piece corresponding to the affixing position of the magnet piece on the mounting device. a vibration pickup that is placed at a position where the magnet piece detects the magnetic field generated by the magnet piece and converts it into an electric signal.