JPH036964A - Underwater communication equipment - Google Patents

Abstract

PURPOSE:To attain communication with stable sound volume and sound quality regardless of a shallow water depth by connecting a sensor detecting a change in a water pressure and sending an output signal in response to the change, and varying the amplification factor of an amplifier and the frequency characteristic or the like. CONSTITUTION:A pressure type sensor 4 is arranged, e.g. under water and subjected to a change in the water pressure attended with the water depth. Since an output of the pressure type sensor 4 changes with a change in the water pressure, the amplification factor and the frequency characteristic of the amplifier 2 are changed via a proper electronic circuit in response to the level of the output signal and the attenuation in the sensitivity and efficiency and the change in the frequency characteristic caused in the speaker 3 and the microphone 1 or the like due to the water pressure are corrected, thereby attaining the communication with nearly constant sound volume and sound quality even at the place of shallow or deep water depth.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an underwater communication device used by a dialer for underwater communication.

(Prior Art) Fig. 3 shows an example of a conventional underwater communication device, in which 1 is an underwater microphone that converts audio into an electrical signal, 2 is an amplifier that amplifies the output signal, and 3 is the output of the amplifier 2. It is a speaker that is added and generates sound.

When a Diaper speaks underwater, the microphone 1 can be installed in a saturation diving submersible, or a bone conduction microphone can be applied to the back of the head or throat to convert the sound into electrical signals. is amplified by amplifier 2 and amplified by speaker 3.

(Intelligence to be Solved by the Invention) However, as is well known, water pressure increases or decreases in proportion to the depth to which the diver dives.

This water pressure is also applied to the microphone 1 and speaker 3, increasing the number of additional purchases, so the conversion characteristics such as the conversion efficiency and frequency characteristics of the electroacoustic transducer change depending on the diving depth! Till! was there.

For these reasons, the conventional device is not easy to use and is also unfavorable from a safety standpoint.

The present invention was proposed in view of the above, and its purpose is to prevent the voice level and sound quality of conversations from changing depending on the depth of diving, to enable stable calls, and to ensure that the dialer is safe. To provide an underwater communication device which allows diving with peace of mind.

(Means for solving 1!!l!) The present invention provides an underwater communication system equipped with an underwater speaker that amplifies the output signal from an underwater microphone with an amplifier and reproduces sound using the output signal of this amplifier. In the device, the above purpose is achieved by connecting a sensor that detects changes in water pressure to the amplifier and sends out an output signal according to the change, and changing the amplification degree, frequency characteristics, etc. of the amplifier. Achieved.

(Function) By configuring as described above, the sensitivity and efficiency attenuation and frequency characteristics that occur in microphones, speakers, etc. due to water pressure are compensated for, and the volume is always kept almost constant even when the water depth changes.
I'm trying to get good sound quality.

(Embodiment) Fig. 1 shows an embodiment of the underwater communication device according to the present invention.
The main feature is that the amplification degree, frequency characteristics, etc. of the amplifier 2 are changed according to the water pressure sensed by the sensor.

That is, the pressure sensor 4 is placed, for example, under water, and is affected by changes in water pressure as the water depth changes. Therefore, the output of the pressure type sensor 4 changes according to the change in water pressure, so the amplification degree, frequency characteristics, etc. of the amplifier 2 are changed through an appropriate electronic circuit according to the level of the output signal, and the microphone 1 It is configured to compensate for sensitivity, attenuation in efficiency, and changes in frequency characteristics that occur in the speaker 3, etc., so that calls can be made with substantially constant volume and sound quality whether in shallow or deep water.

Note that the pressure sensor 4 does not necessarily need to be placed underwater; as long as it can quickly detect changes in water pressure, the pressure sensor 4 can be placed in a case or in a wetsuit, rather than underwater. Of course, it may be placed in an appropriate position.

FIG. 2 shows an example of application of the underwater communication device of the present invention.

In this example, a preamplifier 2° having a pressure sensor 4° is connected to the underwater microphone 1, and the output of the preamplifier 2° is applied to the mixer 5. Further, the output from the mixer 5 is applied to an amplifier 2 having a pressure sensor 4, and the output of the amplifier 2 is applied to a speaker 3.

In this case, the pressure sensor 4 is used to correct the electroacoustic conversion characteristics of the underwater speaker 2, and the pressure sensor 4' is used to correct the electroacoustic conversion characteristics of the microphone 1.

Thus, each sensor 4.4' detects the depth pressure of each of the underwater speaker 3 and microphone 1. Further, the mixer 5 is for controlling underwater-to-underwater and underwater-to-water (on board and on land) calls.

(Effects of the Invention) According to the present invention configured as described above, there is an effect that a call can be made with stable volume and sound quality even in deep and shallow water.

Therefore, the diver can dive with peace of mind.
It also has the effect of preventing accidents caused by poor communication and improving safety.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the basic configuration of an embodiment of the present invention;
The figure shows an application example similar to the above, and FIG. 3 shows a conventional example. l...Underwater microphone, 2...Amplifier, 2゛・
...Preamplifier 3...Speaker, 4°...Sensor 4...Sensor 5...Mixer

Claims (1)

[Claims] Amplifying the output signal from the underwater microphone with an amplifier,
In an underwater communication device equipped with an underwater speaker that reproduces sound using an output signal of this amplifier, a sensor that detects a change in water pressure and sends out an output signal in accordance with the change is connected to the amplifier, and the amplifier An underwater communication device characterized by changing the amplification degree, frequency characteristics, etc.