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JPH08102989

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DESCRIPTION JPH08102989
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater conversation apparatus used in scuba diving and the like.
[0002]
2. Description of the Related Art Conventionally, as shown in FIG. 3, the communicator 5 has put
on the mouth a device in which the output of the microphone 1 is sent to the ultrasonic speaker
13 via the ultrasonic modulator 12.
[0003]
Also, the receiver 6 has put on the head a device in which the output of the ultrasonic
microphone 14 is sent to the diaphragm via the demodulator 15.
[0004]
In the above, when the caller 5 speaks, it is converted into an electric signal by the microphone 1
and output from the ultrasonic speaker 13 as a carrier wave of the ultrasonic wave modulated by
the ultrasonic modulator 12.
[0005]
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The receiver 6 receives the sound by the ultrasonic microphone 14 and the diaphragm 16
vibrates by the voice signal demodulated by the demodulator 15.
Thus, the skull of the receiver 6 is vibrated and recognized as voice.
[0006]
Since the human ear stimulates the auditory nerve by the vibration of the eardrum and perceives
the voice, the acoustic impedance is higher in the water than in the air, and even at the same
sound pressure, the shake is generated. small.
Therefore, the sensitivity to the tympanic membrane is low, and the speech perception in water is
unfavorable.
[0007]
For this reason, the conventional apparatus transmits an ultrasonic wave which can easily
increase the sound pressure, transmits the sound, vibrates the skull by the sound signal with the
diaphragm, stimulates the auditory nerve, and recognizes the sound. The
[0008]
However, in the conventional apparatus, a human can not recognize ultrasonic waves, and it is
necessary to mount a diaphragm on the head, which makes the wearing feeling uncomfortable.
[0009]
Further, it is inconvenient when only a person wearing the diaphragm can talk, and when there
are a plurality of persons.
[0010]
The present invention takes the following means in order to solve the above problems.
[0011]
That is, as an underwater communication device, a microphone provided in a breathing regulator,
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a frequency converter for receiving an output of the microphone and multiplying an audio
frequency by a predetermined amount, an amplifier for receiving an output of the frequency
converter, Providing an underwater speaker for receiving the output of the amplifier.
[0012]
According to the above-mentioned invention, when the talker with the breathing regulator
attached to the mouth in the water speaks a word, it is converted into an electric signal by the
microphone and sent to the frequency converter.
The frequency converter multiplies the audio frequency of the input by a predetermined amount
and outputs the result to the amplifier.
The amplifier amplifies the input and outputs it as an acoustic wave through the underwater
speaker.
[0013]
At this time, in the case of the same sound source intensity, since the sound pressure to be
output is proportional to the square of the frequency, the underwater sound wave is transmitted
far.
The receiver can perceive this underwater sound wave through the tympanic membrane and the
skull and can recognize it as a word as it is.
[0014]
It is because, since the skull has high acoustic impedance, it is easy to propagate when the
frequency is high, and it is easy to be perceived.
[0015]
In this way, underwater calls can be made easily.
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[0016]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention described above will be described with reference to FIGS. 1 and 2. FIG.
The output of the microphone 1 provided in the breathing regulator 7 is sent to the underwater
speaker 4 through the frequency converter 2 and the signal amplifier 3 sequentially.
The frequency converter 2, the signal amplifier 3 and the speaker 4 are mounted outside the
regulator 7.
[0017]
When the caller 5 places the above-described device on the mouth and speaks, the microphone 1
converts it into an electric signal and sends it to the frequency converter 2.
The frequency converter 2 raises the audio frequency of the input by a predetermined factor, for
example, 2 octaves (4 times) and outputs the result to the amplifier 3.
The amplifier 3 amplifies the input and outputs it as an acoustic wave through the underwater
speaker 4.
[0018]
At this time, in the case of the same sound source intensity, the sound pressure to be output is
proportional to the square of the frequency, so the underwater sound wave is transmitted far.
The receiver 6 can sense this underwater sound wave through the tympanic membrane and the
skull and can recognize it as a word as it is. The skull has a high acoustic impedance, so it has a
high frequency, but it is easy to propagate and be susceptible.
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[0019]
In this way, it is possible to easily make underwater calls. Also, since the receiver 6 does not need
to wear the receiver, there is no discomfort due to the wear. Furthermore, it is possible to make
calls to a plurality of listeners 6.
[0020]
As described above, according to the present invention, it is possible to facilitate underwater
communication, and the receiver is expensive and does not need to have a receiver with
discomfort. Also, you can talk to multiple listeners at the same time.
[0021]
Brief description of the drawings
[0022]
1 is a block diagram of an embodiment of the present invention.
[0023]
2 is a side view of the same embodiment.
[0024]
3 is a structural diagram of a conventional example.
[0025]
Explanation of sign
[0026]
1 microphone 2 frequency converter 3 signal amplifier 4 underwater speaker 5 talker 6 receiver
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