JPH0743424B2 - Fish finder - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a fish finder, and more particularly to a fish finder having a display feature on a display.

[Prior art]

FIG. 6 shows a display example on the display of the fish finder. For example, when the display area of the display is configured with 512 horizontal lines and 512 vertical dots, the right end of the area where the underwater exploration results are displayed is displayed.
There is one that can set a display area called "A scope" for the area of 128 lines (one of which is used as a partition line). The A-scope is a display that rewrites the search result into the latest data line by line, but the magnitude of the detected signal level is adjusted so that the strength of the detection signal for each line can be understood. Correspondingly, it is represented by the amplitude spread in the horizontal direction on the display and also displayed by color. Therefore, as shown in FIG. 7, the detection signal is divided into 16 levels (0 to F), and linearly changing amplitude data and 16 types of amplitude data are set for each level. It is provided with a table ROM that stores color data for displaying 16 gradations (or 8 gradations) by color. Therefore, as shown in the A scope of FIG. 6, the sea level X and the sea floor Z having a large detection level are displayed in a wide range as shown by the images x and z.

[Problems to be Solved by the Invention]

However, as shown in FIG. 6, the detection level of the fish Y ₁ detected in the middle layer (assuming it was a medium level) and the detection level of the bottomed fish Y ₂ near the seabed Z (low level) Is very low compared to the detection level of the seabed Z, and therefore the image y ₁ for the middle-layer fish Y ₁ is
Is small, and its identification is difficult, and the image y ₂ for the bottomed fish Y ₂ near the seabed Z is hidden by the image z for the detection level of the seabed Z, which makes it more difficult to identify. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fish finder that makes it easy to see a detection signal of a desired level such as a school of fish with an A scope.

[Means for Solving the Problems]

The first aspect of the present invention transmits an ultrasonic signal immediately below the ship at regular time intervals, whereby each echo is received.
With one line in the vertical direction on one end of the display, the received signal for one echo is displayed in different shades or colors according to the signal strength, and along with this display, the past display lines are sequentially displayed to the other end side. In a fish finder that displays a cross-sectional view directly below in the navigation direction of the ship by shifting by lines, based on the received signal for one line, corresponding to the level of the detection signal in the depth direction, Corresponding to each detection level divided into a plurality of levels, in order to display with a horizontal spread amplitude on a predetermined part of the display and to display the display by color according to the magnitude of the signal level. , Amplitude value and display color data as standard data
In addition to storing it in ROM, in order to emphasize and display the desired target, only the desired level among the level divisions whose amplitude value is made larger than the amplitude of the standard data is also added to the table. It is stored in the ROM, and the standard data or the emphasized data can be selectively read out from the table ROM. A second aspect of the invention transmits an ultrasonic signal in a direction directly below the ship at regular time intervals, whereby each echo is received.
With one line in the vertical direction on one end of the display, the received signal for one echo is displayed in different shades or colors according to the signal strength, and along with this display, the past display lines are sequentially displayed to the other end side. In a fish finder that displays a cross-sectional view directly below in the navigation direction of the ship by shifting by lines, based on the received signal for one line, corresponding to the level of the detection signal in the depth direction, Corresponding to each detection level divided into a plurality of levels, in order to display with a horizontal spread amplitude on a predetermined part of the display and to display the display by color according to the magnitude of the signal level. , Amplitude value and display color data as standard data
In order to emphasize the desired target while storing it in the ROM, the amplitude value for level display is maximized only for the desired level within the level division, and the amplitude value is deviated from the level as it deviates from the level. It is characterized in that the emphasized data with a smaller value is also stored in the table ROM, and the standard data or the emphasized data can be selectively read from the table ROM.

【Example】

FIG. 1 is a control block diagram showing an embodiment of the device of the present invention. Reference numeral 1 denotes a wave transmitter / receiver, which transmits an ultrasonic wave from a transmission signal from a transmission unit 3 via a transmission / reception switch 2 and receives an echo thereof. Reference numeral 4 is a receiving unit for detecting a reception signal from the wave transceiver 1 via the transmission / reception switch 2. 5 is an 8-bit A / D converter that converts the output signal from the receiving unit 4 from analog to digital, and 6 is an 8-bit signal output from the A / D converter 5 (256 kinds of signals (Including a level signal) is converted into 4 bits in order to divide the signal level into 16 levels. 7 is a latch circuit for latching the signal converted by the bit converter 6, and 8
Is a DMA (Direct Memory Access), which directly reads a signal for one line from the latch circuit 7 (without passing through the CPU) and writes it in the SRAM (Static RAM) 9. Reference numeral 10 is a table ROM, which is data for A scope display (standard data) shown in FIG. 7 and data of FIGS. 2 and 3 (emphasized data 1 and 2) relating to the present invention. Is stored as a table. Reference numeral 11 denotes a CPU, which creates data for A scope display by referring to the data read from the table ROM 10 for the signal from the SRAM 9. Reference numeral 12 is a ROM that stores a processing program executed by the CPU 11. 13 is C via the input unit 14
This is a control panel connected to PU11, and this control panel 13
Switch is used to select whether or not to display the A scope, and which data is referred to from the table ROM 10 when the A scope is displayed. Reference numeral 15 denotes a controller that converts the display signal for the signal A scope processed by the CPU 11 and the signal of the original search result into image data. 16 is a VRAM that stores image data processed by the controller 15
(Video Lamb). Reference numeral 17 is a D / A converter that reads from the VRAM 16 and converts it into an analog signal.
Is a CRT for displaying image data from the D / A converter 17.
Is. Next, the operation of the apparatus having the above configuration will be described. It is assumed that when standard data is selected for the A scope by the switch on the operation panel 13, the search result is displayed on the CRT 18 and the A scope display as shown in FIG. 6 is obtained at the right end of the display area. . In this A scope display, the image y ₂ of the bottomed fish is difficult to identify, so it is assumed that the emphasis data 1 shown in FIG. 2 is selected. In this case, as can be seen by comparing with the standard data of FIG. 7, the amplitude value for the low level is large in the emphasized data 1 of FIG.
Only the low-level detection signal is enlarged in the horizontal direction and displayed to obtain the A-scope display as shown in FIG. As can be seen in FIG. 4, only the image for the low level bottomed fish Y ₂ (indicated by y ₂ ′) is highlighted for easier identification. Next, when it is desired to see in detail the image y ₁ for the middle-class fish Y ₁ at the intermediate level shown in FIG. 6, the emphasis data 2 as shown in FIG. 3 is selected. As can be seen from comparison with the standard data of FIG. 7, the emphasized data 2 is such that the middle-level detection signal is enlarged and displayed, and conversely, the high-level detection signal is displayed small in the horizontal direction. The A scope display is obtained as shown in the figure. In FIG. 5, the high level images of the sea surface X and the seabed Z (indicated by x ', z') are displayed in a small size, and conversely, the image of the middle-level fish Y ₁ at the intermediate level (indicated by y ₁ '). Is highlighted.

【The invention's effect】

As described above, in the present invention, in the table ROM for A scope display, the amplitude value of the display image with respect to the level of the detection signal is arbitrarily set, so that, for example, a low level fish school is emphasized and displayed, or unnecessary. The high-level seabed can be displayed in a small size and the probed object can be accurately detected.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a fish finder of the present invention, and FIGS. 2 and 3 are emphasized data 1 and emphasized data for A scope display stored in the table ROM of FIG. 2 shows the table of FIG. 2, and FIG. 4 shows A when using the emphasis data 1 shown in FIG.
The figure which shows the example of a scope display, FIG. 5 is A when using the emphasis data 2 shown in FIG.
FIG. 6 is a diagram showing a scope display example, FIG. 6 is a diagram showing a display example on a fish finder, and FIG. 7 is a diagram showing a data conversion table used for conventional A scope display. DESCRIPTION OF SYMBOLS 1 ... Transceiver, 2 ... Transmission / reception switcher, 3 ... Transmission part, 4 ... Reception part, 5 ... A / D converter, 6 ... Bit converter, 7 ... Latch circuit, 8 ... DMA, 9 ... SRAM, 10 … Table ROM, 11… CPU, 1
2 ... ROM, 13 ... operation panel, 14 ... input section, 15 ... controller, 16 ... VRAM, 17 ... D / A converter, 18 ... CRT.

Claims (2)

[Claims] 1. An ultrasonic signal is transmitted immediately below the ship at fixed time intervals, whereby each echo is received.
With one line in the vertical direction on one end of the display, the received signal for one echo is displayed in different shades or colors according to the signal strength, and along with this display, the past display lines are sequentially displayed to the other end side. In a fish finder that displays a cross-sectional view directly below in the navigation direction of the ship by shifting by lines, based on the received signal for one line, corresponding to the level of the detection signal in the depth direction, Corresponding to each detection level divided into a plurality of levels, in order to display with a horizontal spread amplitude on a predetermined part of the display and to display the display by color according to the magnitude of the signal level. , Amplitude value and display color data as standard data
In addition to storing in the ROM, the emphasized data in which the amplitude value is made larger than the amplitude value of the standard data for only the desired level in the level division is also displayed in order to emphasize and display the desired target. A fish finder which is stored in a table ROM and is capable of selectively reading standard data or emphasized data from the table ROM. 2. An ultrasonic signal is transmitted in a direction directly below the ship at a constant time interval, whereby each echo is received.
With one line in the vertical direction on one end of the display, the received signal for one echo is displayed in different shades or colors according to the signal strength, and along with this display, the past display lines are sequentially displayed to the other end side. In a fish finder that displays a cross-sectional view directly below in the navigation direction of the ship by shifting by lines, based on the received signal for one line, corresponding to the level of the detection signal in the depth direction, Corresponding to each detection level divided into a plurality of levels, in order to display with a horizontal spread amplitude on a predetermined part of the display and to display the display by color according to the magnitude of the signal level. , Amplitude value and display color data as standard data
In order to emphasize the desired target while storing it in the ROM, the amplitude value for level display is maximized only for the desired level within the level division, and the amplitude value is deviated from the level as it deviates from the level. The fish finder characterized in that the enhanced data with reduced size is also stored in the table ROM, and the standard data or the enhanced data can be selectively read from the table ROM.