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JPS6236998

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DESCRIPTION JPS6236998
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
apparatus for transmitting sound waves into water, and more particularly to a transmission
apparatus capable of transmitting high quality signals to people in the water such as a diver.
[Background Art] Conventionally, in order to achieve high-fidelity conversion, this type of device
passes a signal output of a tape recorder or the like to a linear power amplifier, applies it to an
underwater speaker and transmits it as underwater sound. The thing was common. This is similar
to a normal audio device, and what corresponds to the speaker of the audio device is an
underwater speaker in the transmitting device. This underwater speaker operates on an
electroacoustic transducing principle called electrokinetic type. The electrodynamic type is based
on the same principle as an audio speaker, and has a special structure to maintain
watertightness, but it has a flat frequency-related frequency characteristic. This conventional
example will be described based on the block diagram shown in FIG. 2. The signal output from a
signal source 1 such as a tape recorder is applied to an electrodynamic underwater wave
transmitter 3 through a linear power amplifier 2, Transmit as underwater sound. [Problems to be
Solved by the Invention] However, such a conventional example can convert the signal output
from the signal source faithfully and transmit it, but if the human being is underwater, the
underwater sound will be water and There is a problem that the auditory sense can not be heard
as a faithful conversion because it is attenuated by the residual air in the outer ear. The present
invention has been made to solve the above problems, and its object is to eliminate the influence
of attenuation of underwater sound by water and residual air in the outer ear, and to faithfully
make various sound information It is to be able to communicate to the human hearing in the
water. [Means for Solving the Problems] In order to achieve the above object, the present
invention provides an electrodynamic underwater acoustic wave transmitter for transmitting an
output signal from a signal source with an electrodynamic underwater wave transmitter through
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a power amplifier. In view of the attenuation of underwater sound due to water and residual air
in the outer ear, the present invention is characterized in that it comprises an underwater
auditory sense correction equalizer for emphasizing the signal output from the attenuation signal
source. Specifically, it is characterized in that it has an equalizer having a frequency
characteristic of about 6 dB 10 Ct below about 3 KHz and about 18 dB / c + ct above about 3 KH
2. [Operation] The present invention having the above-mentioned features first performs highfrequency emphasis on the signal output from any signal source of the tape recorder or the like
and 6 dBloCt in the case of 3KH2 wandering by the underwater audio sense correction equalizer,
and 3 KHz In the above case, high frequency emphasis is performed with a frequency
characteristic of 18 dB 10 Ct. The high-frequency-emphasized output signal is amplified by a
power amplifier and transmitted to the water as an acoustic wave by an electrodynamic
underwater transmitter.
At this time, since the high frequency output signal is emphasized by the underwater audio sense
correction equalizer, the underwater sound is transmitted to the person in the water by auditory
sense. An embodiment of the present invention will be described below with reference to FIGS. 1
and 3. FIG. FIG. 1 is a block diagram showing an embodiment of an electrodynamic underwater
acoustic wave transmitter according to the present invention, and FIG. 3 is a chart showing
frequency characteristics of an underwater audiovisual correction equalizer used in the
embodiment of the present invention. In FIG. 1, 4 is a signal source such as a tape recorder, 5 is
an underwater hearing correction equalizer, and high-frequency-emphasis the signal output from
the signal source in view of the attenuation of underwater sound by water and residual air in the
outer ear. In this embodiment, as shown in FIG. 3, it has frequency characteristics of 6 dB 10 Ct
less than about 3 KH 2 and 18 dB lo c t more than 3 KH 2. 6 is a power amplifier and 7 is an
electrodynamic underwater transmitter. Next, the operation of the above configuration will be
described. First, the signal such as music recorded in cheap recorder etc. is outputted more than
the signal source 4. However, if the output signal is less than 3 KHz by the underwater auditory
sense correction equalizer 5, the high frequency emphasis is made with the frequency
characteristic of 6 dB / oct. In the case of 3KH2 or more, perform high-frequency emphasis with
the frequency characteristic of 18 dB 10at. The high-frequency-emphasized output signal is
amplified by the power amplifier 6 and transmitted by the electrodynamic underwater
transmitter 7 into the water as a sonic wave. Here, when a person is in the water, the underwater
sound is attenuated by the water and residual air in the outer ear. That is, it has a slope of -6 dB
10ct below 3 KH2 and -18 dB 10 Ct above 3 KH2. However, since the high frequency signal is
emphasized by the underwater auditory sense correction equalizer 5, the signal is transmitted to
the person in the water in a sense of hearing with a flat characteristic. In the case of an
electrodynamic underwater acoustic wave transmitter that transmits only a signal of 3 KH2 or
less when the signal source is not wide band and the electrodynamic underwater wave
transmitter is not wide band, the underwater auditory sense correction is performed. The
equalizer may not have an equalizer characteristic of 18 dB 10 Ct at 3 KHz or higher. As
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described above, according to the electrodynamic underwater acoustic wave transmitting
apparatus according to the present invention, in view of the attenuation of the underwater sound
due to the water and the residual air in the outer ear, the attenuation-equivalent underwater
auditory correction equalizer is a signal source In order to emphasize the signal output from the
high range, various voice information and music information can be faithfully transmitted to
humans in the water with aural sense. For example, when performing synchronized swimming in
the pool, you can play music of the same quality as the air in the water, or you can play
background music or emergency alert in a general pool or beach etc. As a source of loud noise, it
has the effect of being able to send high quality signals to people in the water.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block
diagram of a conventional example, and FIG. 3 is a chart showing frequency characteristics of an
underwater audiovisual correction equalizer used in the embodiment of the present invention.
4 иии Signal source 5 и и и и и и и и и и и и и и и и и и и и и и и и 5 signal source и и и и и и и и и и и и и и и power amplifier 7
и и и patented electric wave underwater wave transmitter Applicants Oki Electric Industry Co., Ltd.
Attorneys Patent attorney Kim Kura Book (Method) October 31, 1985
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