JPS6314510Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an information signal processing device, and is used to process information, especially by eliminating unspecified harmful waves and noise that are mixed into information signals sent at regular intervals, and by eliminating interference caused by interference. The object of this invention is to provide a device that eliminates interference and clearly extracts only information signals.

For example, in the purse seine fishing industry, we need to know the depth of the fishing net and water temperature from moment to moment, refer to this data, and appropriately maneuver the boat to guide the fishing net to the appropriate depth. This operation is effective in improving the fish catch rate, and for this purpose, a pressure sensor that detects water pressure and converts it to depth, a temperature sensor that detects a voltage proportional to water temperature, and the obtained depth and water temperature information signal are used. An underwater station equipped with a transmitter that modulates the frequency of the information, an ultrasonic transmitter that transmits the signal, etc. is attached to the bottom of the net, and the information signal is transmitted underwater to the ship, which is far from the net.

In this case, the situation when the net is stabilized at a predetermined position can be modeled as shown in Figure 1.
is a net, 2 is an underwater station, 3 is the ship, 4 is an ultrasonic receiver, 5 is another ship, 6 is a fish finder transducer, 7 is the sea surface,
8 is the ocean floor.

By the way, when an information signal is sent out from the underwater station 2, a direct wave P ₁ from the underwater station 2 and reflectors P ₂ and P ₃ reflected from the seabed arrive at the ultrasonic receiver 4 of the ship. . In addition, when another boat operates the fish finder in close proximity, interference waves such as those shown on page ₄ may arrive, and other noises such as noise caused by waves and vibrations of the boat may occur at completely unspecified times and cause problems. It causes

Only the information signal _P1 that arrives straight from the underwater station 2 is effective, and the others are an obstacle and are completely unnecessary. Therefore, in the present invention, the information signal that arrives as a direct wave is a regular wave sent at a fixed period. Focusing on the fact that the period T is 100 milliseconds, for example,
During that time, it counted 100 digits and memorized them sequentially starting from address 0, and when they finished memorizing, they memorized a new one in the next cycle. Using a ring counter configured to memorize 4 times in total, 4 times' worth of memorization was completed. Also, the stored signals for four times are taken out through an AND circuit, and unspecified signals with no periodicity are removed to obtain only periodic information.

Embodiments will be described in detail below with reference to drawings showing examples.

FIG. 2 is a block diagram of the receiving system processing device, and FIG. 3 is an explanatory diagram of the operation of each part in FIG.

When an information signal P ₁ (see P ₁ in Figures 1 and 3) with a period T is sent from the network side, the ultrasonic receiver 10 of the ship receives in addition to this information signal from the seabed as described above. Reflected waves from other ships, interference waves from other ships, noise, etc. are mixed in, and the output of the receiver amplifier 11 becomes like a continuous wave as shown in Figure 3 A, and when it passes through the bandpass amplifier 12, it has the same frequency as the signal. Only the component (see FIG. 3B) is obtained, which is then detected by the wave detector 13 and then passed through the Schmitt circuit 14 to become a rectangular wave of a constant level (see FIG. 3C).

Reference numeral 15 denotes a pulse width setting circuit which uses, for example, a monostable multivibrator to convert the output of the Schmitt circuit 14 into a pulse of a constant width (see FIG. 3D). Here, the width of the pulse is determined in advance to account for the fluctuation in the position of the ship and the net, assuming that the position of the ship and the net may change slightly momentarily due to the influence of waves, etc., so that even if the position changes, the signal can be received reliably. Please take this into consideration and set accordingly.

16 is a correlation circuit, as shown in detail in FIG. 4, which includes a clock oscillator 17, an address counter 1
8, rotary switch 19, memory 20.2
1, 22 and 23, an AND circuit 24, etc., and its operation is as follows.

The address counter 18 receives a clock pulse from the clock oscillator 17, and operates to sequentially specify addresses starting from 0 address and up to a set total address amount N during the cycle T of transmitting the information signal, and reaching the final address. The next address is 0, and addresses are designated again consecutively.

That is, while the address counter 18 is operating and sequentially designating addresses from the least significant bit LSB to the most significant bit MSB, the output of the pulse width designating circuit 15 shown in FIG. What is included is stored in memory 20.

Then, at the moment when the final address changes to the 0 address, move the rotary switch 19 one position from the illustrated position in the direction of the arrow. By repeating this operation, the memory 20 → 21 → 22 → 23
→20... and so on, and are stored in sequence by dividing them into T time intervals.

Next, the stored signal is read out using the AND circuit 24.
If the contents of the four memories and the current input signal are always processed at the same time via the can get.

In the above description, a mechanical rotary switch has been exemplified, but for the sake of convenience, it is easy to perform the switch action by electronic control.

As is clear from the above, the present invention makes use of the periodicity of signals to filter out unnecessary signals that come in irregularly and to effectively extract only the necessary signals at all times. The communication is reliable and extremely effective.

[Brief explanation of the drawing]

Figure 1 explains the situation of information transmission. Second
The figure is a block diagram of a receiving system processing device. FIG. 3 is an explanatory diagram of the operation. Figure 4 is a correlation circuit. 1...Net, 2...Underwater station, 3...Ship, 4...
Receiver, 5...Other ship, 6...Transducer, 10...
Receiver, 11... Reception amplifier, 12... Bandwidth wave detector, 13... Wave detector, 14... Schmitt circuit,
15...Pulse width setting circuit, 16...Correlation circuit,
17...Clock oscillator, 18...Address counter, 19...Rotary switch, 20.2
1, 22, 23...memory, 24...AND circuit.

Claims (1)

[Scope of utility model registration request] A band waver that limits the frequency band of the information signal sent out at a constant period T and various other signals that arrive in a mixed manner, and the output of the band waver is detected and converted into a rectangular wave of a certain level. A Schmitt circuit that sets the output of the Schmitt circuit to a constant pulse width, a pulse width setting circuit that sets the output of the Schmitt circuit to a constant pulse width, and the output of the pulse width setting circuit is alternately set at the address 0 specified by the address counter every cycle a plurality of memories that sequentially store data from , a switch that sequentially switches the memories at intervals of T, and a set of the plurality of memories that read out the stored signals;
1. An information signal processing device characterized in that it is configured to extract only information signals of a constant period stored at the same address via an AND circuit.