JPS6220509B2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) This invention displays the level of a detection signal by brightness,
This invention relates to a detection device that obtains detection scanning images on a cathode ray tube (hereinafter abbreviated as CRT).

(Purpose of the Invention) To display only the target detected object image while changing it two-dimensionally or three-dimensionally, so that it can be easily observed even from a somewhat distant place.

(Structure and operation of the invention) An embodiment of a fish finder will be described.
In the figure, transducer 1 has a deeper period than transmitter 3.
A transmission pulse P ₁ given every T ₁ is transmitted, and the resulting reflected wave is received and amplified by the receiver 2 to obtain a detection signal a.

The AD converter 4 converts the level (for example, amplitude value or frequency deviation value) of the detection signal a into a digital value g.
(for example, a 3-digit binary value) to create a digitized detection signal e.

The period selector 6 selects a desired detection scanning period T ₂ within the detection period T ₁ using the transmission pulse P ₁ as a synchronization reference.

The memory device 5 sequentially stores the digitized detection signal e during the detection scanning period _T2 for the number of scans required for raster display described below, and thereafter erases the one corresponding to the oldest detection signal and stores the latest detection signal. It memorizes while updating it like registering something.

A raster scanner 8 generates a so-called horizontal scanning signal h and a vertical scanning signal v for scanning a raster display similar to that of a general television receiver on a CRT 7, and also synchronizes the raster scanning with the contents stored in a memory device 5. Readout control is performed to read out and obtain a readout signal.

The AD converter 9 receives the read output signal of the memory 5,
The digital value is converted into a corresponding analog value to generate a restored detection signal b.

The restored detection signal b is applied to the brightness controller 10 of the CRT 7, and for example, modulates the brightness of the monochromatic raster display of the CRT 7 to create a detection scanning image as shown in FIG.

The detection device with the above configuration judges the strength of the brightness of each displayed image as the level of the detection signal, searches for an image of a specific level among the detection images of various levels, and searches for the target detection object. For example, it is detected as "squid" or "tuna" in plankton. Therefore, this detection requires a considerable amount of gaze effort, and the observer's visual acuity is strained.

During the memory read output, the level selector 11 selects
A detection signal m is generated by detecting a portion that matches a specific level value set in the selection level setter 12.

The fluctuation controller 13 moves the storage position of the storage content corresponding to the readout signal at the time of detection only when the detection signal m is applied.

This movement is a position where the display of the memory content is changed to such an extent that it can be observed as moving relative to the display of other memory content (for example, a position one address ahead or one address behind from the memory position of the corresponding scanning point). ).

After performing this movement operation, the storage movement control is performed so that the operation of returning to the original storage position is repeated as follows.

This repetition is repeated several times ( For example, every 3 to 4 doses) to several doses (5 to 6 doses)
The above storage position movement is carried out over the course of 1 batch).

Therefore, when viewed on the display screen, several rasters are displayed at the moved storage position, and several rasters are displayed at the original storage position, and the same display is repeated.

In the detection device with the above configuration, if the selection level setter 12 is set to the desired position, only the target object image x in the detection scanning image can be moved from the normal display position to the It can be highlighted as a fluctuating image that repeatedly moves slightly in the direction.

Next, the operation of each part will be explained with reference to signal waveform diagrams.

In FIG. 3, the transmitted pulse P has a detection period T ₁
The detection signal a obtained by this is transmitted by
It is applied to the AD converter 4, converted into a digital value g, and applied to the memory 5, but only the amount corresponding to the detection signal a during the detection scanning period _T2 selected by the period selector 6 is stored in the memory. 5 will be stored.

The time interval at which the AD converter 4 performs digital conversion, that is, the sampling pitch t for AD conversion, is determined by the degree of change in the signal obtained within the period _T2 .
It is appropriately selected in consideration of the relationship with the pixel density of the display screen of the CRT 7.

The digitized detection signal e converted to the digital value g is stored in the memory 5 sequentially over the number of scans required for the raster display in FIG. 2, that is, during one period of the detection signal a. T ₂ minutes = 1 scan line,
For example, if the memory contents corresponding to the vertical scanning lines in Fig. 2 are stored sequentially, and one screen is stored, the oldest detection signal a, for example, the one at the left end of Fig. 2, is stored sequentially. One vertical scanning line is erased.

Therefore, the read output signal (digitized detection signal e
) is given to the DA converter 9, and the signals corresponding to the period _T2 of the original detection signal a are sequentially restored, and the scanning lines of the CRT 7 are modulated in brightness.
Display the detection image as shown in Figure 2.

To make the display image in Figure 2 easier to understand, rotate the figure 90 degrees counterclockwise and consider it as a raster scan screen of a television receiver, with scan width A in the horizontal scanning direction and scan width B in the vertical scanning direction. If you look at it like this, it makes sense.

Then, if the AD converter 4 converts the digital value g into three binary digits, that is, divides the analog level into eight levels, the digital value g of each signal in the detection signal a is, for example, the third As shown in column g of the figure,
The transmitted signal k ₁ is [111], the fish school signal x is [010], the submarine signal k ₃ is [100], the plankton signal k ₂ is [001],
Also, areas where there is no signal or where the signal level is less than one binary digit will be marked as [000], and as mentioned above, the memory of these digital values g will last for the number of scans required for raster display. In other words, each of the binary values of the above-mentioned digital value g is stored in a memory portion stored with the same vertical and horizontal addresses as when one screen is subdivided by the pixels as shown in Fig. 2. A certain memory is stored in the memory device 5 for each digit.

The above configuration is a conventional technique known from Japanese Patent Application Laid-Open No. 51-75550 or Toshiba Review (Vol. 27, No. 7, 1972). In such a detection and display device, the following operations are added in the configuration of the present invention.

Now, if the signal level of the target detection target to be displayed in a variable manner is the level [010] of the fish school signal x, this level [010] is set in the level selector 11 by the selection level setter 12. Then, among the signals corresponding to the digitized detection signal e read out from the memory 5, the digital value g is [010]
When the fish school signal x is detected, a signal corresponding to the set digital value [010] is given to the fluctuation controller 13 as the detection signal m.

The fluctuation controller 13 displays the location where the detected [010] is stored in the memory 5 so that the signal image x _{in FIG} . (for example, as described above, an address shifted horizontally or vertically by one address). That is, for example the signal
Remove the memory of [010] from the original memory location using m′ (for example, change the memory to [000]),
When [010] is stored in the memory location of the position to be moved, the control is performed as described above, and then, as described above, the raster number signal r outputted from the raster scanner 8 every time one raster is completed is calculated for 5 to 6 times. is left as is until it is given to the variation controller 13, and when it is given, a control operation that is completely opposite to the above-mentioned memory movement is performed to return the memory position to the original state, and then the raster number signal r is After 3 to 4 times are given to the fluctuation display 13, the storage position is moved again as described above, and every 3 to 4 times of the raster number signal r, 5 of the raster number signal
The control to move the storage position is repeated for ~6 times.

Therefore, the displayed image of the fish school signal x will be displayed flickering between x and x ₁ or x and x ₂ .

On the other hand, since the digital value g of the plankton signal k ₂ , transmission signal k ₁ , and submarine signal k ₃ is not [010], they are not detected by the level selector 11. Since the above-mentioned storage position movement is not performed, these displayed images do not flicker, and in the end, only the image of the signal corresponding to the target level [010] set in the level setting device 12 is displayed in a fluctuating manner. This means that it will be done.

(Effects of the Invention) According to the present invention, the situation of the entire detection target can be grasped using the entire detection scanning image, and at the same time, only a specific object to be detected can be detected by a kind of "flicker" caused by planar fluctuations. Even if you are observing from a somewhat distant place, you can easily know whether it exists or not. In addition, when the movement operation by the fluctuation controller 13 is in the left and right direction, only one eye of the observer can see it. If a light-reducing filter (for example, wearing glasses with gray sunglasses on only one eye) is applied, only the target object can be detected due to the optical illusion effect of the so-called "Bulfritzg pendulum phenomenon".
It has the advantage of being able to observe three-dimensional changes, such as only the target image moving forward or backward on the screen.

(Modified configuration of the invention) This invention allows the following modified configurations.

(1) A detection device that obtains a color detection scanning image by converting the level of the detection signal a into a color code and controlling the brightness of each color of a color CRT, is configured by adding the same corresponding parts as in the embodiment. .

(2) Three-dimensional image when the movement operation of the fluctuation controller 13 is accelerated (for example, the number of movement addresses is increased or decreased every few rasters) and observed using the optical illusion effect due to the "Bulfritzg pendulum phenomenon". Emphasize the fluctuations.

(3) The detection scan is a polar coordinate scan (for example, PPI scope scan), and the CRT display scan is configured with a means corresponding to the scan.

(4) Eliminate interlaced scanning in raster scanning,
Assume that each raster is completely synchronized.

(5) The memory device 5 is constructed of an analog type.

[Brief explanation of the drawing]

The drawings show an embodiment, and FIG. 1 is a block configuration diagram, FIG. 2 is a display image diagram, and FIG. 3 is a main part signal waveform diagram. 1... Transducer/receiver, 2... Receiver, 3... Transmitter, 4...
AD converter, 5...memory device, 6...period selector, 7...
CRT, 8...Raster scanner, 9...DA converter, 1
0...Brightness controller, 11...Level selector, 12...Selection level setter, 13...Variation controller.

Claims (1)

[Scope of Claims] 1. A device that displays a detection signal on a CRT display screen by display scanning such as raster scanning, which converts the detection signal according to the level and converts the signal to the extent required for the scanning display. In a detection and display device that performs the display by controlling the brightness of a single color or each color of the CRT using a signal stored in a memory and read out from the memory contents, the detection and display device comprises: (a) a setting means for setting a specific level of a target detection target; , b detecting means for detecting the specific level in the read signal to obtain a detection signal, and d storing a plurality of signals obtained every time the display scan ends based on the detection signal as described below. a repetition control means that performs control to alternately repeat the position movement means and the storage position return means described below; a storage position moving means for moving and storing data to a storage position that can be observed in a moving manner with respect to the display of other storage contents; 1. A detection and display device comprising: a position return means, so that only the desired detection target can be highlighted as a variable image.