JPH0432626Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) This invention is an underwater detection device that detects objects to be detected underwater using ultrasonic detection signals and displays the underwater situation on a cathode ray tube, for example, in black and white with a brightness that corresponds to the amplitude of the incoming signal. Regarding. (Prior Art) Conventional devices display images in such a way that the brightness becomes brighter in proportion to the magnitude of the amplitude of an incoming signal. (Problems to be Solved by the Invention) In the conventional device, the bottom line is displayed with the brightest brightness, and the school of bottom-based fish that generates a weak reflection signal is displayed with dark brightness. Therefore, the image of the bottom-dwelling fish school is affected by the bright display of the bottom line, making it difficult to identify the bottom-dwelling fish school. (Means for Solving the Problem) The underwater detection device according to this invention detects echo signals caused by a detection signal and reflected by the bottom of the water, a school of fish, etc. so that the magnitude thereof is proportional to the amplitude of these echo signals. Analog-to-digital conversion is performed, the obtained first digital signal is temporarily stored, and the signal read out from this storage is digital-to-analog converted by a digital-to-analog converter, and the obtained analog signal is converted according to the amplitude of the incoming signal. In an underwater detection device, when displaying the echo signal on a display device, the display brightness of the echo signal from the water bottom is lower than when displaying the first digital signal. Among the first digital signals, at least the digital signal representing the echo signal from the water bottom and the digital signal representing the echo signal from the fish school located near the water bottom are selected so that the display brightness of the echo signal from the fish school located near the water bottom is relatively high. a converter for converting a digital signal representing an echo signal into a second digital signal;
switching means for selectively supplying the analog converter;
A school of fish detection means that sends an output signal when a school of fish is detected based on the level of the incoming signal; a range signal generation means that generates a signal representing a depth range including the bottom; and a range signal generation means that changes the display surface of the display based on the depth range signal. A marker display means for displaying a marker representing a depth range in the depth direction at a predetermined position, and a control means for controlling the switching means based on the output signal of the fish school detection means and the output signal of the range signal generation means. Configure as follows. (Example) FIG. 1 shows an example of this invention. Based on the control signal supplied from the controller 2, the transmitter 1 transmits a carrier frequency such as
A 50kHz pulse signal is sent to the transducer 3. The transducer 3 emits an ultrasonic pulse signal into the water based on the input signal. The transducer 3 also captures reflected signals from the seabed, fish schools, etc., and sends them to an analog-to-digital converter (hereinafter referred to as "A-D converter") 5 via an amplifier 4. A-D converter 5
converts the input analog signal into, for example, a 2-bit digital signal (11,
10, 01, 00), and this converted signal is supplied to the input terminal of the memory device 6. The memory device 6 is composed of M 2-bit storage elements in the horizontal direction and N in the vertical direction. The memory device 6 is controlled by a memory controller 15 which is controlled by the controller 2, and the transducer 3
The reflected signals captured by the transducer 3 based on the - detection pulse signal emitted from the - are sequentially written into, for example, the m-th N memory elements. When the second detection pulse signal is emitted from the transducer 3 into the water, the accompanying reflected signal is written into the m+1th N memory elements. Similarly, as the j-th detection pulse signal is emitted into the water,
Reflected signals are sequentially written into the m+jth N memory elements. The controller 2 also sends a control signal to the memory controller 15 and a sweep control signal to the sweep circuit 7. Memory controller 15 supplies write control signals and read control signals to storage device 6 . The memory device 6 is controlled by the memory controller 15 and outputs a digital signal (output of the A-D converter 5) corresponding to the amplitude of the reflected signal, as shown in Table 1, in synchronization with the display operation of the display device 8. Send out.

[Table] This storage signal is passed through gate 9 as a digital signal.
Analog converter (hereinafter referred to as "D-A converter")
10. The DA converter 10 converts the digital input signal into an analog signal and supplies it to the display 8. For example, the number of display devices 8 is M in the horizontal direction.
It is composed of a cathode ray tube having N pixels in the vertical direction, and is controlled by a sweep circuit 7 to sweep the electron beam in the horizontal and vertical directions. The display 8 is the first
As shown in the table, when the digital output signal of the converter 5 is "11", the display brightness is "bright", when it is "10", the brightness is "medium", and when it is "01", it is "dark".
When it is “00”, it is displayed as “off”. The display 8 displays a black and white image as shown in FIG. 2 based on the signal read out from the memory 6. As shown in Table 1, the converter 11 converts the input signal "11" into "01", and similarly converts the input signal "10" into "01".
Convert “01” and “00” to “11”, “10”, and “00” respectively. These converted digital signals are supplied to the DA converter 10 via the gate 12. D
The -A converter 10 converts the input signal into an analog signal and supplies it to the input terminal of the display 8. As a result, as shown in Table 1, when the output signal of the A-D converter 5 is "11", the display brightness of the display 8 is set to "dark".
When the value is "10", the brightness is "bright", when it is "01", the brightness is "medium", and when it is "00", the brightness is "off". The switch 13 selects the gate 9 or 12 and opens it to allow the digital signal to pass. FIG. 2 shows a black and white image on the display surface of the display 8. When the switch 13 selects and opens the gate 9 and the output signal of the A-D converter 5 shown in Table 1 is supplied to the D-A converter 10, a message appears on the display screen. The oscillation line 20 and submarine line 21 are “bright”
Displayed at a brightness of The fish school 22 is at "medium" brightness, and the bottom-attached fish school 23 is at "dark" brightness.
In addition, a portion 25 where no other object to be detected is present is displayed with "off" brightness. On the other hand, the switch 13 selects the gate 12 and selects the first
When the output of the converter 11 shown in the table is supplied to the D-A converter 10, an oscillation line 20 and a submarine line 21 are displayed on the display screen based on the same signal read out from the memory 6. School of fish 2 at “dark” brightness
2 is displayed in black and white with a brightness of "bright", a school of bottom fish 23 with a brightness of "medium", and other parts 25 with a brightness of "off". First, the case where the switch 13 selects the gate 9 to pass a signal will be explained. A detection pulse signal generated by the transmitter 1 based on a control signal from the controller 2 is emitted into the water by the transducer 3. The reflected signal is captured by the transducer 3, amplified by the amplifier 4, converted into a digital signal by the A-D converter 5, and then sequentially sent to N memory elements arranged in the vertical direction of the memory 6. written. Similarly,
Each time a probe pulse signal is launched into the water, the reflected signal is written to a new column of storage elements. The storage signal read from the storage device 6 is supplied to the DA converter 10 via the gate 9, converted into an analog signal, and supplied to the input terminal of the display 8. At this time, the image shown in FIG. 2 is displayed on the display screen. The oscillation line 20 and the seabed line 21 show a school of fish 22 at a brightness level of "medium" and a school of bottom-based fish 23.
is displayed with "dark" brightness. In cases where it is difficult to identify the bottom fish school 23, the gate 12 is selected using the switch 13. The signal read out from the memory 6 is sent to the converter 11 and the gate 1.
2. The signal is supplied to the display 8 via the DA converter 10. In this case, the output signal of the memory 6 is
Since the conversion is performed as shown in the figure, the fish school 22 is displayed with "bright" brightness, and the bottom-attached fish school 23 is displayed with "medium" brightness. At this time, the submarine line 21 is “dark”
Since it is displayed at a brightness of , the group of bottom-attached fish 23 is displayed brighter and highlighted. Therefore, the bottom-attaching fish school 23 can be easily identified. When selecting gate 9, the bottom line 21 is displayed in "bright" and the bottom fish school 23 is displayed in "dark" brightness, so the display of the bottom fish school 23 does not affect the bottom line 21. and is difficult to identify. FIG. 3 shows a block diagram of another embodiment of the invention. Hereinafter, parts labeled with the same symbols or numbers as those of the above-mentioned embodiment shown in FIG. 1 perform the same functions. In FIG. 3, the digital output signal from the A/D converter 5 is supplied to the input terminal of the memory 6 and also to the input terminal of the converter 11.
Converter 11 receives digital input signals “11” and “10”
“01” and “00” are each digital signal “01”
Convert to “11”, “10” and “00”. The converted digital signal is supplied to the input terminal of memory 16. The storage device 16 has the same configuration as the storage device 6,
perform the same function. The digital output signal of the converter 11 is sequentially written into the m-th N memory elements in the memory 16 under the control of the memory controller 15;
It also sends the storage signal to the read gate 12.
The underwater situation is as shown in Table 1.
3, i.e., on the display 8 based on the output signal of the A-D converter 5 or the converter 11. Is displayed. In the above embodiment, the underwater situation is displayed on the entire display surface of the display 8 as one group consisting of different brightness, but as shown in FIG. It is also possible to simultaneously display two pictures representing the same underwater situation adjacent to each other on the display screen based on the signal. In FIG. 4, a picture based on the output signal of the AD converter 5 is displayed on the right half of the display surface of the display 8. That is, the oscillation line 20 and the submarine line 2
1 is displayed with "bright" brightness, the school of fish 23 is displayed with "dark" brightness, and the other parts of the display surface are displayed with "off" brightness. On the left half of the display surface of the display device 8, the oscillation line 20 and the seafloor line 21 are displayed with "dark" brightness, the fish school 23 is displayed with "medium" brightness, and the other part of the display surface is displayed with "medium" brightness. Displayed with “off” brightness.
These operations are performed by controlling the switch 13 and selecting the gate 9 or 12 based on a control signal supplied from the controller 2. In this case, when the gate 9 is selected, the memory 6 starts reading out the stored digital signal, and when the gate 12 is selected, the memory 6 stops the read operation, and the memory 16 starts reading out the stored digital signal. Start reading the stored signal. Note that the switch 13 can also be operated automatically. In FIG. 5, the A-D converter 5
The digital output signal of is supplied to the input terminal of the memory device 6, and the fish school detector 31 is composed of, for example, a comparator, and when the digital input signal indicating the amplitude of the reflected signal is less than a predetermined value, an AND gate 32 The output signal is sent to one input terminal of the . The marker signal generator 33 is composed of, for example, a single-shot multivibrator and a flip-flop circuit connected thereto. The single-shot multivibrator generates pulse signals with different pulse widths depending on the signal supplied from the controller 2. This pulse width is adjusted using regulator 34. The falling portion of this pulse drives a flip-flop circuit to generate a marker signal. This marker signal is supplied to the other input terminal of the AND gate 32 and to the input terminal of the memory 6. The marker signal is controlled by the memory controller 15 and is stored in and read out from the memory 6 such that the vertical marker 30 is displayed at the right edge of the display. The length of this vertical marker 30 is adjusted by an adjuster 30. and gate 32
supplies a pulse signal to the timer 35 when receiving a reflected signal from a school of fish located within the depth range corresponding to the vertical marker 30. timer 35
generates a pulse signal lasting, for example, 5 seconds, in response to an input signal. The switch 13 opens the gate 12 while the output signal from the timer 35 is being supplied to the switch 13 . Therefore, the switch 13
is automatically driven. When there is no school of fish within the depth range represented by the vertical marker 30, the bottom line 21 is displayed with "bright" brightness. When a school of fish 23 is detected, the switch 13 selects the gate 12 to pass the output signal of the converter 11, thereby placing the school of fish 23 at "medium" brightness and the seabed line at "dark" brightness. indicate. Incidentally, a buffer memory 38 can also be provided between the AD converter 5 and the memory 6. The buffer memory 38 is controlled by the controller 2 and/or the memory controller 15, temporarily stores the reflected signal caused by the detection signal, supplies it to the memory 6, and further supplies it to the converter 11. In this case, memory devices 6 and 1
The display operation of reading out signals from the probe 6 and displaying these signals on the display 8 is performed independently of the detection operation of emitting detection signals into the water and receiving reflected waves. In FIG. 4, the display surface of the display device is divided into two equal parts, but it is also possible to widen or narrow the width of one picture. In this case, the width of the other pictures narrows or widens accordingly. (Effects of the invention) According to this invention, when displaying by increasing the brightness of the display in sequence according to the magnitude of the amplitude of the incoming signal, it is possible to reproduce and display the underwater situation as it is, and When a school of fish existing within a predetermined depth range is detected, the correspondence between the amplitude of the incoming signal and the display brightness can be changed to emphasize and display the school of bottom-based fish. Can be easily identified.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of this invention. 2 and 4 are examples of display on the display surface of the display device. FIG. 3 is a block diagram of another embodiment of this invention. FIG. 5 is a partial block diagram of an embodiment of this invention.

Claims (1)

[Claim for Utility Model Registration] The first product obtained by converting echo signals caused by detection signals and reflected by the bottom of the water, schools of fish, etc. from analog to digital so that the magnitude thereof is proportional to the amplitude of these echo signals. Temporarily memorize the digital signal of
In an underwater detection device that displays the analog signal obtained by digital-to-analog conversion of the signal read from the memory by a digital-to-analog converter on a display with different brightness depending on the amplitude of the incoming signal, the echo signal is When displayed on the display, the display brightness of the echo signal from the school of fish located near the water bottom is relatively higher than the display brightness of the echo signal from the water bottom, compared to when the first digital signal is displayed. a converter for converting at least a digital signal representing an echo signal from the water bottom and a digital signal representing an echo signal from a school of fish located near the water bottom into a second digital signal among the first digital signals; switching means for selectively supplying a first digital signal read from the storage device or a second digital signal sent from the converter to the digital-to-analog converter; and detecting a school of fish based on the level of the incoming signal. a range signal generating means that generates a signal representing a depth range including the bottom of the water; and a range signal generating means that generates a signal representing a depth range including the bottom of the water; An underwater detection device comprising: marker display means for displaying a marker representing the school of fish; and control means for controlling the switching means based on the output signal of the fish school detection means and the output signal of the range signal generation means.