JP3082299B2 - Underwater intercom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater communication device for transmitting and receiving signals via a transducer.

[0002]

2. Description of the Related Art Conventionally, when making a call with a submerged submarine or the like using an underwater communication device, first, sound waves are transmitted to a target ship via a transceiver, and the target ship receiving the sound waves transmits the sound wave from the target ship. The communication is started after receiving the response sound wave.

[0003]

However, the communicable range is limited by the sound pressure level of the sound wave transmitted from the underwater communication device. Therefore, when starting a call with a submerged submarine, etc., if the target ship is at a distance beyond the communicable range, the transmitted sound waves will not be received by the target ship, so there will be wasted time in calling. There is a problem that it is wasteful and inefficient.

[0004] It is an object of the present invention to provide an underwater communication device capable of confirming a separation distance from a target ship and efficiently starting a telephone call.

[0005]

The underwater telephone according to the present invention comprises:
In an underwater communication device that performs transmission / reception via a transmitter / receiver, a pulse generation unit for generating a pulse for distance measurement, a clock generation unit for generating a clock having a frequency higher than an audio signal, and a distance measurement for inputting the clock Gate means for gated and output with a pulse for use, a first switch for sending a pulse for distance measurement generated by the pulse generation means to the gate means at the time of distance measurement, and an output of the gate means at a predetermined frequency. A transmitting means for converting the signal into a signal, amplifying and transmitting the signal to the transducer, a pulse detecting means for detecting the distance measuring pulse from a signal received via the transducer, and the pulse generating means. Distance calculation display means for calculating and displaying a distance from a time difference between the pulse for distance measurement and the pulse for distance measurement detected by the pulse detection means; and a distance measurement pulse detected by the pulse detection means. The a scan during normal sent to said gate means, second the distance measurement to be sent to the distance calculation display means
And a switch.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which both ships making a call are equipped with the same underwater communication device.

In a talking state, a sound wave of 8 to 11 kHz transmitted from the other ship into the water is received via the transmission / reception unit 1 and the transmission / reception switching unit 2, demodulated by the reception unit 3 and listened to by the speaker 4. I do. Further, the audio signal from the microphone 5 is converted into a signal of 8 to 11 kHz band by the transmission unit 6 and transmitted to the other ship via the transmission / reception switching unit 2 and the transmission / reception unit 1.

When a call is started, the distance between the ship and the other ship is measured, and it is checked whether the call is possible. Therefore, a distance measuring pulse generator 7 for generating a distance measuring pulse P1, a distance measuring switch 8 for switching at the time of distance measuring, a clock generator 9 for generating a clock C, and a gate circuit 10
And a ranging pulse detector 1 for detecting the received ranging pulse.
1 and a distance calculation display section 12 for calculating and displaying the distance.

Next, the operation will be described.

When starting a call, first, the distance measuring switch 8
Is switched to the distance measurement ON side as shown in FIG. 1, the distance measurement pulse P1 from the distance measurement pulse generator 7 is applied to the gate circuit 10.
Supplied to The gate circuit 10 calculates the product of the clock C from the clock generator 9 and the distance measuring pulse P1, and calculates the signal P
2 is output. Here, the frequency of the clock C is set to be higher than the frequency band of the audio signal (100 to 3100 Hz). After the signal P2 is frequency-converted and amplified by the transmission unit 6, the transmission / reception switching unit 2 and the transmission / reception unit 1
Is launched into the water as sound waves.

The receiving section 3 is always in a receiving state, demodulates a signal received via the transmitting / receiving section 1 and the transmitting / receiving switching section 2, sends an audio signal component to the speaker 4, and outputs a distance measuring pulse. The component is sent to the distance measurement pulse detection unit 11.

The underwater communication device mounted on the other ship has the same configuration as that of FIG. 1. Here, the operation of the underwater communication device on the other ship side will be described with reference to FIG. Normally, the distance measuring switch 8 on the other ship is set to the distance measuring off side, and when receiving the distance measuring pulse propagating in the water, the distance measuring pulse detecting unit 11 is activated.
Detects the distance measurement pulse component, shapes the waveform, and sends it as a response distance measurement pulse to the gate circuit 10 via the distance measurement switch 8. This response distance measuring pulse is the distance measuring pulse P described above.
As in the case of No. 1, it is emitted into the water via the transmitting and receiving unit 1.

By receiving the response ranging pulse transmitted from the other ship in this way, the ranging pulse detector 1
1 can be obtained as a response ranging pulse Pr. The distance calculation display unit 12 receives the response distance measurement pulse Pr and the distance measurement pulse P1 via the switch 8, and measures the time difference between the two pulses using the clock C. Further, the distance is calculated from the time difference and displayed. After confirming the displayed distance, the correspondent sets the distance measurement switch 8 to the distance measurement off side, and starts a telephone call if the distance is within the communication distance.

[0015]

As described above, according to the present invention, the distance measuring pulse is transmitted by switching the switch to the distance measuring ON side, and the distance measuring pulse is transmitted back from the underwater communication device of the other ship receiving the distance measuring pulse. By adding a function that detects the response pulse, measures the time difference between the transmitted ranging pulse and the detected pulse, and calculates and displays the distance, you can check the separation distance from the partner ship when you start a call In this case, the call can be started in the case of the communicable distance, so that the call can be started efficiently without wasting time for calling.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmitting / receiving section 3 receiving section 6 transmitting section 7 distance measuring pulse generating section 8 distance measuring switch 9 clock generating section 10 gate circuit 11 distance measuring pulse detecting section 12 distance calculating display section C clock P1 distance measuring pulse Pr response distance measuring pulse

Claims (1)

(57) [Claims] 1. An underwater communication device for transmitting and receiving signals via a transmitter / receiver, a pulse generator for generating a pulse for distance measurement, a clock generator for generating a clock having a higher frequency than an audio signal, and the clock A gate for outputting a distance measurement pulse generated by the pulse generation means at the time of distance measurement; a first switch for transmitting the distance measurement pulse generated by the pulse generation means to the gate means at the time of distance measurement; Transmitting means for converting an output into a signal of a predetermined frequency, amplifying and transmitting the signal to the transducer, pulse detecting means for detecting the distance measuring pulse from a signal received via the transducer, and the pulse Distance calculating and displaying means for calculating and displaying a distance from a time difference between the distance measuring pulse generated by the generating means and the distance measuring pulse detected by the pulse detecting means; and A second switch for transmitting a pulse for distance measurement to the gate means during normal operation and transmitting the pulse to the distance calculation display means during distance measurement.