JPS6349737Y2 - - Google Patents

Description

[Detailed explanation of the idea]

For example, in a detection device such as a fish finder, detection information is expressed as a single display line, and the display lines corresponding to multiple detections are sequentially arranged and displayed on a cathode ray tube. This relates to a device that displays a display on a cathode ray tube similar to that of the recording paper type detection device. For example, in a fish finder, information on one or more detections is collectively displayed as one display line in the vertical direction at one end of the display screen of a cathode ray tube display device, and a display line corresponding to the oldest detection information is displayed. A large number of display lines are arranged so that they are displayed as vertical display lines on the other end of the display screen, and corresponding to the frequency of detection, the oldest detection display lines are sequentially erased, and new detection information display lines are displayed. By always displaying at one end of the display screen, it is possible to display in a format similar to that of recording paper, and this has already been put into practical use. This display method uses a color cathode ray tube to display a large amount of information in different colors depending on the level of the detection signal, for example. For example, even in cases where there are small differences in reflection levels, such as schools of fish in a plankton layer, and they are hidden and difficult to distinguish when displayed on recording paper, signals with slight level differences are easily noticeable on a color cathode ray tube display. By displaying in a different color, it can be easily distinguished and readability can be significantly increased. Such a cathode ray tube display device not only displays a large amount of information and improves legibility;
Since images can be easily rewritten, erased, and combined, it is possible to divide the screen into multiple areas to display different information, change the movement of some display areas, or overlap characters, symbols, graphs, etc. It is possible to perform various display operations, such as displaying a single image or completely replacing the display on the screen, making it possible to realize an extremely convenient display device. The present invention relates to a water depth warning device using a color cathode ray tube display as described above. In other words, a fish finder using a color cathode ray tube (hereinafter referred to as a color fish finder) uses multiple colors to display a large amount of information on the color cathode ray tube. Instead, it is capable of numerically displaying the range, water depth, water temperature, etc., as well as displaying a variable range mark (hereinafter referred to as VRM), and is already in practical use. The present invention compares these displayed marks or set numbers with the depth numbers obtained by detection,
The system is designed to issue an alarm based on the relationship between the size and size of the fish, and even if you are not looking at the displayed image, you can know when you are approaching the target fish area and the shallow water, providing a safe and convenient color fish finder. It is. This will be explained in detail below using the drawings. FIG. 1 shows a system diagram of a color fish finder which is an example of the present invention. The output of the original oscillator 14 is divided by the frequency divider 15 and the frequency divider 20 to create a transmission pulse signal as shown in FIG. Fire it into the sea. The ultrasonic pulse signal is a reflected signal reflected by a school of fish 4 in the sea or the seabed 3, and is received by the same transducer 2 used for transmission. This signal is amplified and detected by the receiver 5, and as shown in FIG. 2B, a transmission trigger signal 2a, a fish school signal 4a, a seabed signal 3a, etc. The signal is converted into a digital code according to the level by the device 6. The correlation circuit 7 is a signal processing circuit for interference cancellation and the like, and after signal processing is performed here, the signal is guided to the buffer memory 8. The buffer memory 8 temporarily stores digitally encoded detection information, and this is stored over a period of time corresponding to the speed at which the ultrasonic wave propagates back and forth in seawater. That is, the time required to write and store information in the buffer memory 8 differs depending on the detection distance (or depth). When one piece of detection information has been written to the buffer memory 8, that information is subsequently transferred and written to the main memory 9, which has a storage capacity for one screen. This transfer is performed within the retrace period of the sub-scan of the cathode ray tube display 13, which performs surface scanning in the main scan and sub-scan. To explain this situation using the waveform in Figure 2, T ₂
indicates the period of one detection, and a rest period of _T3 is provided between the period _T1 until the next ultrasonic wave is emitted. FIG. 2E shows a clock signal for operating the buffer memory 8. The range selector switch 22 controls the clocks of various cycles generated by the frequency divider 18, and the selector 19 selects one of them to buffer the buffer memory. 8. The number of clock pulses in Figure 2E is, for example, 256.
The detection range is divided into 256 samples. When writing to the buffer memory 8 is completed, the sub-scanning signal shown in FIG. 2D is applied to the transfer controller 17 from the 16b terminal of the frequency divider 16, so that
Among the sub-scanning signals following the trailing edge of the waveform, the signal shown in FIG. The contents of are transferred to the main memory 9. On the other hand, the cathode ray tube display 13 is surface-scanned by the main scanning synchronization signal taken out from the terminal 16a of the frequency divider 16 and the sub-scanning synchronization signal taken out from the terminal 16b. The information is obtained by repeatedly reading out the main memory 9 in which one screen worth of detection information is stored. Therefore, the main memory 9
In addition to the main scanning synchronization signal and sub-scanning synchronization signal,
An information reading clock signal is supplied from the output terminal 15a of the frequency divider 15. Between the main memory 9 and the cathode ray tube display 13, the contents of the main memory 9 are processed in various ways to display the cathode ray tube display 1.
3, a data processing circuit 10, a modulation circuit 11 for superimposing and displaying scales, numbers, etc. on the display screen, and a decoder 12 for converting digital code information into color signals for each display. There is. Display examples of the cathode ray tube display 13 are shown in FIGS. 3A and 3B.
, and the detection signal, for example, Fig. 2B, is 1
Since the books are displayed and arranged on one display line 38, the display line 38 of the transmission line as a whole changes over time.
5. Displays include a seabed display 36 and a school of fish display 37. Further, in order to easily read the depth of the displayed image, scales and characters as shown in FIG. 3B are displayed superimposed on the image in FIG. 3A. The above explanation is for a conventional color fish finder, but the depth warning device of the present invention compares the set depth of the VRM, which is superimposed on the detection information display screen, and the seabed depth obtained by detection. A warning is issued depending on the magnitude of the difference. First, we will explain in detail step by step the VRM depth settings. The shift switch 24 in Fig. 1 is used to set the amount of shift of the detection range, for example, the detection range from 0 to 100 meters is changed from 33 to
Used to shift and change to 133 meters. This type of usage is necessary when the depth of the water for detection exceeds the set detection range. In other words, if you change the detection range from 0 to 200 meters, the displayed image of detected fish schools etc. will be reduced, so you can shift the detection range to make it easier to compare the images with the same size without this happening. It is used to do. The set value of this shift switch 24 is determined by the frequency divider 2
0 and when the detection information is taken into the buffer memory 8, the timing of the start of taking in is controlled to be delayed. For example, in the image example shown in FIG. 3B, the output of the frequency divider 20 is controlled to be stopped for the time required for the ultrasonic waves to travel back and forth 33 meters underwater. On the other hand, the setting value of the shift switch 24 is also guided to the scale data processing circuit 26, and is used to display the display scale at a position corresponding to the detected image as shown in FIG. 3B. VRM (variable range mark) signal generation circuit 25
is the display depth setting circuit of the VRM41 in Fig. 3B, and the display depth setting circuit for each of the other depth scales 3 is set to any desired depth.
9 and 40 and are moved and displayed separately. The VRM 41 can be set by moving at a finer pitch than the fine scale depth line 39, and the VRM
The displayed depth of 41 is displayed numerically at the same time, so if you move the VRM 41 to the depth of the displayed image and overlap it, you can directly read the depth, which is extremely convenient. FIG. 4 shows the scale data processing circuit 26, electronic scale signal generation circuit 27, and scale position control circuit 28 in more detail. Shift amount information is input from the shift information input terminal 60, and the sub-scanning synchronization signal 5 shown in FIG. 5A is input to the down counter 61.
Loaded at the leading edge of 9a. Next, the frequency of the clock signal coming from the clock input terminal 66 is divided by the frequency divider 67, and the shift pulse 59b shown in FIG. 5B at the terminal 67a is sent to the down counter 61 and counted down. When a borrow signal is output from the down counter 61, the borrow signal resets the address counter 68 and counts up the clock signal at the clock input terminal 66, so that the address counter 68
Specify addresses of RAM 70 in sequence. At this time, the flip-flop 69 is simultaneously set by the borrow signal from the down counter 61, and the flip-flop 69 is reset by the output signal from the address counter 68. During this period, the output of the flip-flop 69 is the R/W signal 59 in FIG.
c, the RAM 70 is in the write state. On the other hand, from the output terminal 67b of the frequency divider 67, the fifth
A fine scale signal 59d as shown in FIG. D and a coarse scale signal 59e from the output terminal 67c are supplied as write signals to the RAM 70. The storage capacity of the RAM 70 is, for example, three columns of 256 address bits, and an example of the relationship between each signal clock frequency in this case is as shown in Table 1. Regarding the VRM, a pulse signal is generated from the pulse generation circuit 63 in response to a control signal from the VRM control terminal 62, and the up-down counter 64 is set to a certain value, for example, [72]. The numerical value [72] is loaded into the down counter 65, and is counted down by the clock pulse from the output terminal 67a of the frequency divider 67, and a borrow pulse is output.

[Table] In this situation, 59j in Fig. 5J is the input down pulse signal of the down counter 65, and Fig. 5K
59k from down counter 65, RAM70
is a borrow pulse supplied to The three types of input signals to the RAM70 are shown in Figure 3B.
The data is added to the timing corresponding to the relative position of each depth mark shown in FIG. 5C, and the period of the R/W signal 59c in FIG. In this way, writing to the RAM 70 is completed within the period of the sub-scanning synchronization signal shown in FIG. 5A. Reading from the RAM 70 is repeated every time in synchronization with the main scanning synchronization signal from the main scanning synchronization signal input terminal 76. These read signals correspond to the main scanning video period signal 59f in FIG.
9h, VRM display signal 59l. Among the signals read out from the RAM 70, signals for displaying fine scale and coarse scale are controlled by a gate 71 so as to be read out only for a certain period of time. This is a gate that controls the display so that it is displayed as a dotted line not on the entire left and right sides but on a part, like the fine scale depth line 39 and the coarse scale depth line 40 in FIG. 3B. FIG. 6 is a waveform diagram showing this situation. 59m in FIG. 6A is a sub-scanning synchronization signal, and from its trailing edge to the monostable multivibrator 7 in FIG.
4 works. The time constant of this monostable multivibrator 74 is controlled by a variable resistor 78. The output of this monostable multivibrator 74 is 5 in Fig. 6B.
The counter 73 is operated at the trailing edge of 9n to count the main scanning synchronizing signal to obtain signals with waveforms as shown at 59p in FIG. 6C and 59q in FIG. 6D.
By controlling the gate 71 with the output of the counter 73 created in this way and changing the time constant of the monostable multivibrator 74 that creates the desired depth scale indicated by the dotted line, the depth scale shown in FIG. 3B can be changed. Needless to say, the position can be moved left and right. Further, the VRM signal, which is one of the outputs of the RAM 70, is led directly to the latch 72 without passing through the gate 71, and is displayed on the entire left and right sides as shown in the VRM 41 of FIG. 3B. The latch 72 is used for waveform shaping of each signal read from the RAM 70. The output of latch 72 is provided via output terminal 77 to modulation circuit 11 of FIG. In the modulation circuit 11, fine scale, coarse scale,
Each display signal of the VRM is modulated so as to be displayed in different colors, for example, fine scale is green-blue, coarse scale is yellow, and VRM is green. Note that the display of numbers can be easily realized by supplying the load information to the down counters 61 and 65 in FIG. 4 to the character generator 32 in FIG. 1. The above is an explanation of the electronic scale and VRM, but the water depth alarm device of the present invention guides the value of the up-down counter 64 shown in FIG. 4, that is, the set depth value of the VRM, to the magnitude comparison circuit 57 shown in FIG. , a seabed detection circuit 79, an alarm 58, and other parts. As shown in FIG. 2B, the seabed detection circuit 79 detects the strongest signal, especially after removing the transmission trigger signal 2a, because the seabed signal 3a is generally stronger than the fish school signal 4a. Furthermore, in order to avoid false bottom detection in the event that a signal stronger than the bottom signal is present due to a large school of fish, the seabed depth information detected by repeated detections is memorized, and the seabed depth information detected by repeated detections is stored. A so-called seabed tracking detection method is used in which if the next detection signal exists within a certain depth range before and after, it is regarded as a seabed signal. The depth of the seabed signal 3a detected in this way is the time from the transmission trigger to the seafloor signal 3a, which is the basic time required for a sound wave to travel back and forth underwater (for example, it takes 1.33 milliseconds to travel 1 meter back and forth in seawater). It is measured using a periodic signal. The rotation detection circuit 79 leads the actually measured seabed depth number to the magnitude comparison circuit 57, where it is compared with another VRM display depth number given to the magnitude comparison circuit 57. The result is selected with the switch 80 and the alarm 58
For example, it can be used to set off a buzzer. For example, the switch 80 is selected to warn when the seabed becomes shallower than the VRM in order to prevent ships from running aground, and when a fishing boat heads to a fishing ground, it is selected to issue an alarm when the seabed becomes deeper than the VRM. It is used to give an alarm and let people know that they are approaching a fishing area. As mentioned above, according to this idea, the depth of the ocean floor and
A comparison circuit 57 compares the values with the VRM depth, and the magnitude relationship of the comparison result can be selected by a switch 80. This not only makes it possible to detect when the seabed depth is shallower than the set VRM depth, which can be used to prevent groundings, but also allows VRM
It is possible to issue a warning by selectively detecting states in which the seabed depth is shallower than the seabed depth and states in which the seabed depth is deeper than the seabed depth.For example, it is also possible to notify you that you are approaching a fishing ground depending on various types of fishing. be. Moreover, when you look at the display when these alarms occur, you will see that the VRM
is displayed horizontally with respect to the depth direction, and
It is very convenient to be able to visually read the intersecting condition with the VRM display immediately.

[Brief explanation of the drawing]

Figure 1 is a structural diagram of a color fish finder constructed using the present invention, Figures 2, 5 and 6 are waveform diagrams for explaining the present invention, and Figures 3A and B.
4 shows an example of a video display, and FIG. 4 shows an example of a detailed system diagram of the electronic scale creation section that constitutes the present invention. 1...Transmitter, 2...Transducer, 3...Seafloor,
4...Fish school, 5...Receiver, 6...A-D converter, 7...Correlation circuit, 8...Buffer memory, 9
...Main memory, 10...Data processing circuit, 11...
... Modulation circuit, 12 ... Decoder, 13 ... Cathode ray tube display, 14 ... Original oscillator, 15 ... Frequency divider,
16... Frequency divider, 17... Transfer controller, 18...
Frequency divider, 19...Selector, 20...Frequency divider, 2
DESCRIPTION OF SYMBOLS 1... Encoder, 22... Range selection switch, 23... Processing command switch, 24... Shift switch, 25... VRM signal generation circuit, 26...
... Scale data processing circuit, 27 ... Electronic scale signal generation circuit, 28 ... Scale position control circuit, 29 ... Water temperature information input terminal, 30 ... Data conversion circuit, 31
... Water temperature memory, 32 ... Character generator, 33 ... Data input terminal, 34 ... Display screen, 35 ... Display of transmission line, 36 ... Display of seabed, 37 ... Display of fish schools, 38 ... Display line, 39
...Fine scale depth line, 40...Coarse scale depth line, 41
... VRM, 42 ... Character display, 48 ... Display address designation circuit, 57 ... Size comparison circuit, 58
...Alarm, 59a-q...Various waveform diagrams, 60...
...Shift information input terminal, 61...Down counter, 62...VRM control terminal, 63...Pulse generation circuit, 64...Up-down counter, 65...
...Down counter, 66...Clock input terminal,
67... Frequency divider, 68... Address counter, 6
9...Flip-flop, 70...RAM, 71
... Gate, 72 ... Latch, 73 ... Counter, 74 ... Monostable multivibrator, 75 ...
... Sub-scan synchronization signal input terminal, 76 ... Main scan synchronization signal input terminal, 77 ... Output terminal, 78 ... Variable resistor, 79 ... Seabed detection circuit, 80 ... Switch.

Claims (1)

[Claims for Utility Model Registration] Repeatedly transmitting transmission pulses, receiving reflected waves from a reflecting object, capturing and storing the received detection signal as digital information in main memory, and storing the memory in the main memory. In a detection display device in which the received detection signal is repeatedly read out for one screen and supplied to the cathode ray tube display, and the received detection signal is displayed as one display line on the cathode ray tube display, and the display lines are arranged in chronological order, the display screen In addition, there is a means for displaying a variable range mark (VRM) that extends horizontally with respect to the depth direction, a means for obtaining the depth of the VRM as a numerical value, and a means for measuring the seabed depth from the detection signal and calculating the depth as a numerical value. a comparison circuit that compares the magnitude of numerical values; a switch that selects the magnitude result of the signal generated as a result of the magnitude comparison of the comparison circuit; and an alarm to which the comparison result selected by the switch is supplied. A water depth warning device equipped with.