JPS623362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote underwater detection and recording device used when recording detection signals from an underwater detection device attached to a fishing net using a tugboat.

When recording underwater detection signals from the fishing net side, it is possible to observe the trawl situation in great detail by simultaneously recording the detection signals from above as well as from below the fishing net.

The downward underwater detection signal and the upward underwater detection signal of the fishing net are transmitted in a time-division manner from the fishing net side. Therefore, on the towing boat side, the underwater detection signal is recorded by performing a recording operation in synchronization with this time-division signal. In other words, to record a downward underwater detection signal, the recording pen is moved downward from a specific position on the recording paper, and when to record an upward underwater detection signal, the recording pen is moved upward from that specific position. let In this case, a multi-needle electrode recording pen whose running operation is electronically performed is used as the recording pen.

In the conventional apparatus described above, the recording range for recording the downward underwater detection signal and the upward underwater detection signal on the recording paper is fixed in advance. Therefore,
If only one of the downward underwater detection signal and the upward underwater detection signal needs to be recorded, the recording paper is only partially used, which has the disadvantage that the recording paper is not used effectively.

The present invention makes effective use of the recording paper in the remote underwater detection device as described above by arbitrarily setting the recording start position of each underwater detection signal in the downward and upward directions on the recording paper. To provide a recording device that can

This will be explained below with reference to the embodiments shown in the drawings.

In FIG. 1, a receiver 1 receives an underwater detection signal transmitted as an ultrasonic signal from the fishing net side, and a receiver 2 reproduces and transmits the signal.

Figure 2a shows the underwater detection signal sent by the receiver 2, where S ₀ is the synchronization signal, S ₁ is the temperature signal, S ₂ is the downward detection pulse, S _2F is the fish reflection pulse, and S _2R is the seabed reflection pulse. , S ₃ is an upward detection pulse, S _3F is a fish reflected wave, and S _3R is a sea surface reflected wave.

This underwater detection signal a is sent to the synchronous wave selection circuit 3.

The synchronous wave selection circuit 3 selects the synchronous signal S ₀ from among the underwater detection signals a, and detection of the synchronous signal S ₀ is performed, for example, by integrating the underwater detection signal a. That is, the synchronization signal S ₀ is set in advance so that its pulse width is the longest. Therefore, when integrating the underwater detection signal a,
Since the integral waveform has the highest peak value for the synchronization signal _S0 , it can be detected by slicing the integral waveform at a constant level.

When the synchronous wave selection circuit 3 selects the synchronous signal _S0 , it sends out the selection pulse shown in FIG. 2b. This selection pulse b is sent to the set input of flip-flop 4 and activates flip-flop 4.

The startup output of the flip-flop 4 is the gate circuit 5.
clock pulse source 6 during its start-up period.
The clock pulse of

The clock pulse train that has passed through the gate circuit 5 is sent to a counter 7 and counted. Counter 7 counts the pulse train and sends the counting output to decoder 8.

The decoder 8 sequentially sends output pulses to the output terminals P ₁ , P ₂ , and P ₃ when the counter 7 counts the pulse train. When the counter 7 exceeds its counting capacity, the decoder 8 sends out an output pulse E ₄ (FIG. 2e) at the output P ₄ . This output pulse
_E4 is sent to the reset input of flip-flop 4, causing flip-flop 4 to be reset.

Therefore, the flip-flop 4 remains activated from the selection pulse b of the synchronizing signal _S0 to the output pulse _E4 of the decoder 8, as shown in FIG. 2c. During this start-up period T' ₀ , the clock pulse train is
The signal passes through the gate circuit 5 as shown in FIG. in this case,
The period of the clock pulse train and the counting capacity of the counter 7 are set so that the activation period T ₀ ' of the flip-flop 4 substantially coincides with one period T ₀ of the underwater detection signal a.

When the counter 7 counts the clock pulse train d, each of the output pulses E ₁ , E ₂ , E ₃ (FIG. 2e) sent by the decoder 8 to the output terminals P ₁ , P ₂ , P ₃ is applied to the flip-flop 9. , 10 and 11 separately.

When the flip-flop 9 is first activated based on the output pulse _E1 , this activation output is sent to the gate circuit 13 via the OR circuit 12, making the gate circuit 13 conductive. The gate circuit 13 passes a clock pulse train of an appropriate period sent out by the counter 7, in fact, a frequency-divided pulse train of the clock pulse train d. Then, the pulse train that has passed through the gate circuit 13 is guided to an addition terminal of a reversible counter 15 via an OR circuit 14, where it is added and counted. Note that the count value of the reversible counter 15 is reset in advance by the selection pulse b when the synchronous wave selection circuit 3 selects the synchronous signal _S0 .

Therefore, the reversible counter 15 sequentially adds and counts from zero at the same time as the flip-flop 9 is activated. The counting output of the reversible counter 15 is sent to the decoder 16
sent to. The decoder 16 sends an output pulse to the output terminal corresponding to the count value of the reversible counter 15 among the output terminals 1 to n. This output pulse is then sent to the gate circuit 17 and sent to the corresponding recording pen among the multi-needle electrode recording pens 1 to n.
It guides the underwater detection signal sent from the receiver 2.

The reversible counter 15 performs addition counting as described above, and when the count value reaches i, the decoder 1
6 sends an output pulse Fi (FIG. 2e) to the i-th output. This output pulse Fi is sent to the reset input of flip-flop 9 and causes flip-flop 9 to be reset. Therefore, the flip-flop 9 is activated from the output pulse E ₁ of the decoder 8 to the output pulse Fi of the decoder 16 _, as shown in FIG. 2 g ₁ , and during this period, as shown in FIG. clock pulses in the gate circuit 13
pass through.

In the underwater detection signal a, the temperature signal S ₁ appears within ΔT _{1 hour after T 1 hour} after the synchronization signal S ₀ .
Then, within this Δt ₁ hour, the appearance position of the temperature signal S ₁ changes according to the water temperature on the fishing net side. Therefore, the activation period of the flip-flop 9 (g ₁ in FIG. 2) is defined as the appearance time △t ₁ of the temperature signal S ₁
, a temperature recording line 19 is recorded on the recording paper 18 within the recording range W ₁ of the first to i-th recording pens.

On the other hand, the startup output _g1 of flip-flop 9 is OR
It is sent out via circuit 12 to monostable circuit 21 .
The monostable circuit 21 is activated at the falling edge of the starting output _g1 , that is, when the flip-flop 9 is reset, and sends out the starting output _q1 in FIG. 2 as a gate wave to the gate circuit 22. monostable circuit 21
The activation period Td can be changed arbitrarily by a knob 23.

The gate circuit 22 is conductive during the start-up period of the monostable circuit 21 and passes the clock pulse train of the clock pulse source 6 as shown in FIG. 2 _γ1 .

Example of clock pulse γ passing through gate circuit 22
₁ is led to the addition terminal of the reversible counter 15 via the OR circuit 14, where addition and counting is performed.

In the above, when temperature recording 19 is performed, reversible counter 15 counts i clock pulse trains _h1 . Therefore, when the clock pulse train _r1 is sent out from the gate circuit 22, the reversible counter 15
performs addition counting sequentially starting from the count value i. and,
Assuming that k clock pulses are sent during the startup period Td of the monostable circuit 21, the count value j of the reversible counter 15 after startup is j=i+k (1).

After starting the monostable circuit 21, the decoder 8
Send pulse wave E ₂ to P ₂ . This pulse wave E ₂
is transmitted so as to approximately coincide with the downward underwater detection pulse S ₂ that appears ₂ hours after the synchronization signal S ₀ . Note that the activation period Td of the monostable circuit 21 is varied from the time when the activation output _g1 of the flip-flop 9 falls to the time when the pulse wave _E2 appears.

Pulse wave E ₂ is sent to the set input of flip-flop 10, activating flip-flop 10. The activation output of flip-flop 10 is sent to gate circuit 13 via OR circuit 12, making gate circuit 13 conductive. The gate circuit 13 allows the clock pulse train of the counter 7 to pass through, and causes the reversible counter 15 to add and count the passed clock pulses in the same manner as when the flip-flop 9 is activated.

Therefore, the reversible counter 15 performs addition counting again from the count value j in equation (1), and the decoder 16 sends out output pulses in order from the j-th output terminal. During this time, the downward underwater detection pulse S ₂ , the fish school reflected wave S _2F , the seabed reflected wave S _2R , etc. sent from the receiver 2 are sequentially applied to the j-th to n-th multi-needle electrode recording pens.

As a result, a downward oscillation line 24, a fish school record 25, a sea bottom line 26, etc. are recorded on the recording paper 18 within the recording range _W3 from the j-th recording pen position to the n-th recording pen position.

After the downward underwater detection signal is recorded, an output pulse Fn is sent to the nth output of the decoder 16, and this output pulse Fn is sent to the reset input of the flip-flop 10, causing the flip-flop 10 to be reset. Therefore, the flip-flop 10 is connected to the decoder ₈ as shown in FIG.
from the pulse wave E ₂ of the decoder 16 to the pulse wave Fn of the decoder 16
Start up until. And during this startup period,
(n-j) clock pulse trains are connected to gate circuit 1.
3 (Fig. 2 h ₂ ).

The output pulse Fn of the decoder 16 resets the flip-flop 10 and is also sent to the preset terminal of the reversible counter 15, presetting the count value of the reversible counter 15 to the set value i' of the value setter 27. .

On the other hand, the starting output g ₂ of the flip-flop 10 is
The signal is also sent to the monostable circuit 21 via the OR circuit 12, and the monostable circuit 21 is activated when the signal falls.

The monostable circuit 21 is activated for the time Td in the same way as when the flip-flop 9 is reset, and as shown in FIG _.
The activation output of the gate circuit 22 is sent to the gate circuit 22. The gate circuit 22 conducts during this start-up period Td and sends k clock pulse trains _γ2 to the reversible counter 15.
The reversible counter 15 adds and counts this pulse train _r2 . Therefore, the count value j' after addition and counting is j'=i'+k (2).

In the above, the monostable circuit 21 is activated every time the flip-flops 9 and 10 are reset.
At each activation, the reversible counter 15 adds and counts k clock pulses, but the decoder 16 does not operate during this time.
That is, the activation outputs g ₁ and g ₂ of flip-flops 9 and 10 are sent from the OR circuit 12 to the decoder 16, and the decoder 16 operates only while the activation outputs g ₁ and g ₂ continue.

After the reversible counter 15 has counted up to the count value j', the decoder 8 sends out a pulse wave E ₃ (FIG. 2e) to the output terminal P ₃ . This pulse wave E ₃ is a synchronization signal
It is sent out to approximately coincide with the upward underwater detection pulse S ₃ that appears after T ₃ hours from S ₀ (FIG. 2a). And the pulse wave E ₃ is the flip-flop 1
1 to the set input of flip-flop 11.
Activate.

The activation output of the flip-flop 11 is sent to the gate circuit 28, and the gate circuit 28 is activated during activation.
conduction. The gate circuit 28 is the gate circuit 1
3, the clock pulse train sent from the counter 7 is passed while the flip-flop 11 is activated. The clock pulse train that has passed through the gate circuit 28 is sent to the subtraction terminal of the reversible counter 15.

Therefore, the reversible counter 15 performs subtraction counting from the count value j', and the decoder 16 sends out an output pulse in the opposite direction from the j'th output terminal. Then, the upward underwater detection pulse S ₃ sent from the receiver 2,
The fish school reflected wave S _3F , the sea surface reflected wave S _3R, etc. are distributed to each recording pen in the opposite direction from the j'-th multi-needle electrode recording pen. As a result, on the recording paper 18, a sea surface direction oscillation line 29, a fish school record 30, a sea surface line 31, etc. are recorded from the j'-th recording pen position toward the left.

The decoder 16 sends an output pulse in the opposite direction to each output terminal in accordance with the subtraction count of the reversible counter 15, and outputs the output pulse Fi' to the output terminal i (FIG. 2 f).
Send out. This output pulse Fi' is sent to the reset input of flip-flop 11 to reset flip-flop 11.

Therefore, the flip-flop 11 is activated from the output pulse _E3 of the decoder 8 to the output pulse Fi' of the decoder 16, as shown in FIG. _2g3 .
The gate circuit 28 passes the (j'-i) pulse train h ₃ (FIG. 2). As a result, an oscillation line 29, a fish school record 30, and a sea surface line 3 are recorded on the recording paper 18.
The first grade is recorded in the W ₂ recording range from the j'th to the ith point of the multi-needle electrode recording pen.

As a result of the above, among the underwater detection signals in Figure 2a,
The temperature signal S ₁ is recorded in the range W ₁ on the recording paper 18 corresponding to the first to i-th recording pens. Then, the downward underwater detection signals S ₂ , S _2F , S _2r
etc. are recorded in the recording range W ₃ from the jth recording pen position to the right. Also, upward underwater detection signal
S ₃ , S _3F , S _3r etc. are i from the j'th recording pen position.
Recording is performed in the W ₂ recording range in the direction of the th recording pen position.

In the above, the j-th recording pen position at which recording of the downward underwater detection signal starts is determined by the activation period Td of the monostable circuit 21, as is clear from equation (1).
It changes depending on the number k of pulse trains passing through the gate circuit 22. Therefore, by changing the activation period Td of the monostable circuit 21 using the knob 23, the recording start position of the downward underwater detection signal, that is, the recording position of the oscillation line 24 can be arbitrarily changed. Also, when recording the downward underwater detection signal in the recording range of _W3 , the recording can be made to any size by appropriately changing the period of the clock pulse sent from the gate circuit 13 to the addition terminal of the reversible counter 15. It is possible to enlarge or reduce the size.

Next, the recording start position of the underwater detection signal in the upward direction
As is clear from equation (2), j′ is also the monostable circuit 21
It is determined by the number k of pulse trains passing through the gate circuit 22 during the activation period Td. Therefore, when changing the recording start position j of the downward underwater detection signal,
In conjunction with this, the upward recording start position also changes.
At this time, the set value of the value setter 27
When i′ is set to i′=i, j′=j from equations (1) and (2). Therefore, in this case, since the recording start positions of the downward underwater detection record and the upward underwater detection record coincide, the downward oscillation line 2 appears on the recording paper 18.
4 and the upward oscillation line 29 are recorded in duplicate.
Therefore, by setting the set value i' of the numerical value setter 27 slightly smaller than i, the recording position of the upward oscillation line 29 will be slightly to the left of the downward oscillation line 24 when recording the upward direction detection signal. It can be recorded at a displaced position.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows a waveform diagram for explaining its operation.

Claims (1)

[Claims] 1. A synchronization pulse transmitted from a remote location underwater;
A recording device that receives and records an information signal in which second and third underwater information are arranged in a time-division manner, comprising: a receiver that receives the information signal; and a multi-handle that records the time-division information signal. an electrode recording pen; a synchronization pulse selection circuit that selects the synchronization pulse; and a clock pulse train that counts clock pulse trains based on the selected output of the synchronization pulse, and the counted value is used as each of the first, second, and third underwater information. a counting circuit that sends out each of the first, second, and third pulses each time a value corresponding to the expected appearance position of is reached; and when the first and second pulses are sent out, a clock pulse train is added and counted. When the third pulse is sent out, a reversible counting circuit subtracts and counts the clock pulse train, and the information signal output from the receiver is converted into a count value of the reversible counting circuit of the multi-needle electrode recording pen. a gate circuit that leads to the recording pen corresponding to the recording pen; and a gate circuit that leads to the recording pen corresponding to the third
a presetting circuit that presets the count value of the reversible counting circuit to a specific value until the pulse is sent out;
and a pulse train sending circuit that sends out a specific number of pulse trains to the addition terminal of the reversible counting circuit until the pulse is sent out and after the end of the preset until the third pulse is sent out. Underwater remote recording device. 2. The underwater remote recording device according to claim 1, wherein the preset value of the preset circuit is set to be slightly different from the number of clock pulses for adding and counting using the first pulse.