JPS645306B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention, in a detection device such as a fish finder, displays detection information as a single display line, and sequentially arranges display lines corresponding to a large number of detection information to display a cathode ray tube. This relates to a device that displays on a cathode ray tube a display similar to that of a conventional 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 can display a large amount of information and increase the degree of discrimination, but also allows images to be easily rewritten, erased, combined, etc., making it possible to divide the screen into multiple areas. Various display operations are possible, such as displaying different information, changing the movement of only a portion of the display area, displaying overlapping characters, symbols, or graphs, and completely replacing the display on the screen. A very convenient display device can be realized.

The present invention relates to a color fish finder using a color cathode ray tube display as described above, and furthermore, like a sonar, the present invention relates to a color fish finder using a part of a transducer consisting of a plurality of transducers of the fish finder. By measuring the phase of the vibrator, the direction from the own ship is detected, and the detected detection information is used to display the direction between the marker line divisions in Figure 5A.

Also, this display section is updated every time a signal is detected, and the section B in Figure 5 moves from right to left every time a signal is detected, similar to the conventional colored fish schools. .

If this method is adopted as described above, the surface layer, middle layer,
Since the direction of a school of fish on the bottom relative to the own boat can be determined, a school of fish found once with a color fish finder that simply displays a detection signal as before will not be missed, providing an extremely convenient device for catching schools of fish. 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.

The above description is of a conventional color fish finder. Parts of the invention are shown in FIG. 3 and will be explained in detail below with reference to the drawings.

FIG. 6A shows the configuration of a transducer, which is composed of a large number of oscillators, and O indicates a normal transmitting/receiving drive winding. Also, a in Figure 6B,
Winding A is obtained by adding another winding to the vibrator shown in FIG. Similarly, Figure 6C
The windings c and d are for phase detection in the front and rear directions.

89 in FIG. 3 is an input signal from the transducer in FIG.

For example, FIG. 4A is the transmit trigger pulse, and FIG. 4B is the transmission trigger pulse shown in FIG.
etc. is the received amplified signal.

The signal whose waveform has been shaped in step 98 becomes as shown in FIG. 4D. Also, D is shown enlarged to make it easier to see a certain portion of the B signal. The output of FIG. 398 is differentiated by the differentiating circuit 102, and its waveform is as shown in FIG. 4E.

Figure 6. Transducer receiving signal winding a.
Similarly, the signals from C and E are 94, 95, and 9.
6,99,100,101,102,103,1
04 and 105 in the same manner as above.
Further, FIG. 4F is the differential output of FIG. 3 103.
On the other hand, FIG. 3 81 is the output of the receiving circuit 5 of FIG. 1, and the waveform is as shown in FIG. 4 C.

This detected waveform is shaped by a waveform shaping circuit 97 and gate circuits 106, 107, 108, 109
is supplied to Each gate circuit group has a first
It serves to open the gate when the signal received by the transducer of the general color fish finder shown in the figure exceeds a certain level. The above gate circuit group is input to phase detection circuits 110 and 111, and 1
10,111 directions are determined, each 4
One output is provided to buffer memory 112.
The phase detection circuits 110 and 111 are generally constructed from flip-flops and measure the interval between two differential pulses.

To simplify the explanation, in FIG. 3, the angle division has an accuracy of four full-width divisions. Also, the capacity of buffer memory 112 is naturally four times larger since there are four control signals from buffer memory 110 and 111. Further, as for the information in the buffer memory 112, a signal 116 which is a digital signal from the correlation circuit 7 in FIG. 1 is supplied to the buffer memory 112 in FIG. The operation of the buffer memory 112 is as shown in FIG.
The contents of the buffer memory 112 are transferred to the main memory 113 in FIG. 3 during the blanking period of the sub-scanning signal. The direction display marker generation circuit 114 in FIG. 3 is a circuit that generates a marker indicating the boundary line of the angle signal in each of the four directions as shown in FIG. 5A. Each line of the scanning signal is shown.

The outputs of 113 and 114 in FIG.
5, where they are each synthesized and further added to the modulation circuit 11 in FIG. 1, and the contents of the main memory 9 and another main memory 113 are switched and displayed on the color cathode ray tube as shown in FIG. .

FIG. 5 is displayed on a portion of the right side of one screen, and B on the left side is an image of a conventional color fish finder. The latest detection information is gated with angle information between each mark A on the right side, and is displayed as a signal corresponding to four directions in the same manner as in part B. Further, in the above explanation, the angle division is four divisions, but the same idea can be considered even if this is divided into multiple divisions and displayed.

For example, if you want to divide the angle into 8,
A phase comparator circuit for comparing the phase amounts of the outputs of the phase detection circuits 110 and 111 in FIG. 3 is shown in FIG.
11 and the buffer memory 112, and obtains outputs divided into eight from the phase comparator circuit.
This can be realized by supplying the output 116 of the D converter 6 to a buffer memory 112 which has eight channels added, and further dividing and displaying the display A in FIG. 5 into eight sections via the main memory 113. .

[Brief explanation of drawings]

FIG. 1 is a general configuration diagram of a color fish finder constructed using the present invention, FIG. 2 is a waveform diagram explaining the operation and principle of FIG. 1, and FIG. 3 is a configuration diagram of the part of the present invention. FIG. 4 is a waveform diagram illustrating the operation and principle of FIG. 3, and FIG. 5 is an example of an image displayed on a color cathode ray tube according to the present invention. FIG. 6 shows an example of the configuration of a transducer used in 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, 21 ... Encoder, 22 ... Range selection switch, 23 ... Processing command switch, 24 ... Shift switch, 25 ... VRM signal generation circuit ,2
6... 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, 48...Display addressing circuit, 81...Receiver detection output, 82...Output of frequency divider 20, 83... Microwave clock, 84...Memory transfer clock,
85... Frequency divider 15a output clock, 86... Sub-scanning signal, 87... Main scanning signal, 88... Direction display data, 89... Output of Fig. 6A, 90...
Output of Figure 6 A, 91... Output of Figure 6 C, 92
...Output of Figure 6D, 93...Receiver of Figure 6A, 94...Receiver of Figure 6B, 95...Receiver of Figure 6C, 96...Receiver of Figure 6D Receiver, 97...
... Waveform shaping circuit, 98... Waveform shaping circuit, 99...
... Waveform shaping circuit, 100 ... Waveform shaping circuit, 10
1...Waveform shaping circuit, 102...Differentiating circuit, 10
3... Differential circuit, 104... Differential circuit, 105...
... Differential circuit, 106 ... Gate circuit, 107 ...
Gate circuit, 108... Gate circuit, 109...
Gate circuit, 110... Phase detection circuit, 111...
...Phase detection circuit, 112...Buffer memory, 1
13...Main memory, 114...Direction display marker generation circuit, 115...Composition circuit, 116...A-
Output of D converter 6.

Claims (1)

[Claims] 1. Repeatedly transmitting ultrasonic pulses into the water via a transducer (transducer), receiving reflected waves from a reflecting object via the transducer, and converting the received detection signal into digital information. It is converted and stored in the main memory for displaying one screen via the buffer memory, and the main memory is repeatedly read out and supplied to the color cathode ray tube display.
In a detection display device in which a received detection signal is displayed as one display line on the color cathode ray tube display, and the display lines are arranged in chronological order, a receiving winding for phase detection is installed in a partial element of the transducer. are provided in two orthogonal pairs, the phase of the incoming signal between each pair of windings is detected, and the two types of phase detection outputs obtained from the two pairs are separated into at least four types according to the polarity and phase amount. gate the digital signal with a signal, take the gated signal into another main memory through a buffer memory different from the buffer memory, and transfer the information stored in these two main memories to a color cathode ray tube display. When displaying, 1
An ultrasonic color cathode ray tube detection and display device characterized in that a display screen is divided into two areas along a display line and the display is switched between the two areas.