JP3814734B2 - Fish finder - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fish finder that emits ultrasonic waves of one frequency into the water, and displays the fish underwater, the lake bottom, etc. in two according to the depth.
[0002]
[Prior art]
In black bass fishing, which has been popular as a sport fishing in recent years, black bass often lives on the bottom of a hard lake, so it is important information to distinguish the hardness of the bottom of the lake. In fish finder and dual-frequency fish finder, emphasis is placed on the display of underwater information, that is, information from the surface of the water to the bottom of the lake.
[0003]
[Problems to be solved by the invention]
By the way, when the ultrasonic wave is emitted toward the lake bottom, since the reflection of the ultrasonic wave is small on the soft lake bottom, even if the sensitivity is improved so much, it is possible to display the second and third reflected waves of the ultrasonic wave. Although difficult, when the ultrasonic wave is emitted toward the hard lake bottom, the reflected wave of the ultrasonic wave is large, and therefore the second and third reflected waves can be displayed.
[0004]
However, even if there is a case where it is desired to know the state of the bottom of the lake in detail by displaying the second and third reflected waves of the ultrasonic wave with the conventional dual-frequency parallel fish finder, the second reflection and the third from the bottom of the lake. If the depth range is deepened to see the reflected waves, the image from the water surface to the bottom of the lake is compressed, making it difficult to see the state of the water and the image of the fish, and shifting the screen to center on the second and third reflected waves When displayed, the image of the underwater or fish protrudes from the screen, and therefore there is a drawback that the underwater state and the state of the lake bottom cannot be seen at the same time.
[0005]
[Means for Solving the Problems]
The present invention applies an oscillation signal from one transmission circuit to one ultrasonic vibrator, irradiates the ultrasonic wave from the ultrasonic vibrator into water, receives a reflected wave from the water, and displays it on the display device. In the fish finder, the depth is automatically set with the first receiving circuit provided with the first depth setting circuit capable of setting the depth range in advance for the reflected wave signal received from the ultrasonic transducer from the water. The reflected echo signals received by the second receiving circuit provided with the second depth setting circuit and amplified by the first and second receiving circuits are respectively digital by the first and second A / D converters. The signal is converted into an echo signal, the digital echo signal is stored in the first and second memories, respectively, and the control signal from the digital echo signal stored in either the first or second memory is detected by the lake bottom detection circuit. The first reflected wave bottom desi Detecting a echo signal, calculating a multiple signal capable of detecting a secondary (tertiary) reflected wave signal from the lake bottom digital echo signal by a secondary (tertiary) arithmetic circuit, and inputting the same to the second depth setting circuit. Thus, the depth received by the second receiving circuit is automatically set by the second depth setting circuit, and the digital echo signal in the depth range set from the reflected wave signal from the ultrasonic transducer is The digital signal stored in the second memory and read from the first and second memories by the control device is read, and one screen of the display device is divided into two and displayed in respective depth ranges. Is.
[0006]
[Action]
In the present invention, first frequency ultrasonic waves are emitted into water, the reflected echoes are received by one ultrasonic transducer, and the depth range of the reflected echo signals from the ultrasonic transducers can be set in advance. The normal depth range is set by the depth setting circuit, the depth is appropriately set in advance by the second depth setting circuit, and the reflected echo signals are received in the depth ranges set by the first and second receiving circuits, respectively. The first and second A / D converters convert the reflected echo signals respectively amplified and amplified by the first and second receiving circuits to digital echo signals, and are stored in the first and second memories. The signal stored in either the first or second memory is read by the control device, the lake bottom digital echo signal is detected by the lake bottom detection circuit, and the secondary (3 ) A multiple signal capable of detecting a secondary (tertiary) reflected wave signal is calculated by the arithmetic circuit and input to the second depth setting circuit to set the depth, thereby setting the second depth setting circuit. The digital echo signal in the depth range is stored in the second memory, the signals stored in the first and second memories are read out by the control device, and the display screen of one display device is divided and displayed in parallel. By displaying the range from the water surface to the bottom of the lake on one screen, and displaying the secondary or tertiary reflected waves of ultrasonic waves on the other screen, And the soft state can be displayed simultaneously.
[0007]
【Example】
FIG. 1 is a block diagram of a fish detector according to an embodiment of the present invention. A transmitter circuit 1 is connected to an ultrasonic transducer 2 and connected to input terminals of first and second receiver circuits 3 and 4. The first receiving circuit 3 is connected to a first depth setting circuit 5 that can set a normal underwater depth in advance and incorporates a sensitivity setting circuit in which sensitivity is set as appropriate. The second receiving circuit 4 A depth range can be set as appropriate, and a second depth setting circuit 6 including a sensitivity setting circuit in which sensitivity is set as appropriate is connected. The output terminals of the first and second receiving circuits 3 and 4 are connected to the first The input terminals of the first and second A / D converters 7 and 8 are connected, and the output terminals of the first and second A / D converters 7 and 8 are connected to the first and second memories 9. 10 is connected, the control device 11 is connected to the first and second memories 9, 10, and the control device 11 The device 12 is connected, and the control device 11 is connected to a lake bottom detection circuit 13 that can detect a lake bottom digital echo signal from a digital echo signal read from either the first or second memory 9 or 10. The lake bottom detection circuit 13 is connected to a secondary (tertiary) arithmetic circuit 14 for calculating a multiple signal capable of detecting a secondary (tertiary) reflected wave signal. The received signal is input to the second depth setting circuit 6 to automatically set the depth.
[0008]
In the fish finder according to the present embodiment configured as described above, when a signal of one frequency from the transmission circuit 1 is applied to the ultrasonic transducer 2, reflected echoes in the water and the bottom of the lake are reflected by the ultrasonic transducer 2. The received echo signal from the ultrasonic transducer 2 is input to the first and second receiving circuits 3 and 4.
[0009]
Here, since the first depth setting circuit 5 is configured to set a normal underwater depth in advance, the first receiving circuit 3 receives a reflected echo signal from the ultrasonic transducer 2 to the lake surface from the water surface. , And the reflected echo signal received and amplified by the first receiving circuit 3 is converted into a digital echo signal by the A / D converter 7 and stored in the first memory 9.
[0010]
Therefore, the digital echo signal stored in the first memory 9 is read out by the control device 11 composed of the CPU, whereby the lake bottom digital echo signal is detected from the digital echo signal by the lake bottom detection circuit 13, and the lake bottom digital signal is By calculating a multiple signal that can be input to the secondary (third order) arithmetic circuit 14 and capable of detecting the secondary (third order) reflected signal, and inputting the multiple signal to the second depth setting circuit 6, The depth setting circuit 6 automatically sets the depth at which the second receiving circuit 4 can receive the reflected signal from the reflected bottom echo signal of the reflected echo signal input from the ultrasonic transducer 2 to the subsequent secondary or tertiary antireflection signal. The reflected echo signal that is set, received by the second receiving circuit 4 and amplified is converted into a digital echo signal by the second A / D converter 8 and stored in the second memory 10.
[0011]
Then, the digital echo signal sequentially read from the first and second memories 9 and 10 by the control device 11 divides the screen 15 of the display device 12 into two screens 15a and 15b as shown in FIG. In this divided screen 15a, the underwater state from the water surface 16a to the lake bottom 16b is displayed as set by the first depth setting circuit 5, and the divided screen 15b As set by the second depth setting circuit 6, the lake bottom 17c by the second reflected wave and the lake bottom 17d by the third reflected wave are displayed outside the water surface 17a and the lake bottom 17b of the primary reflected wave. The place where the lake bottom 17c and the lake bottom 17d are displayed can be regarded as a hard lake bottom, and the portion where the tertiary reflected wave is not displayed until the second order can be regarded as a soft lake bottom.
[0012]
As described above, in the present invention, the digital echo signal stored in the first memory 9 is read by the control device 11, the lake bottom digital echo signal is detected by the lake bottom detection circuit 13, and the secondary (tertiary) arithmetic circuit 14 performs the detection. By calculating a multiple signal that can detect a secondary (tertiary) reflected signal and inputting the multiple signal to the second depth setting circuit 6, the second receiving circuit 4 can automatically set the depth. In addition, since the screen 15 of one display device 12 is divided into the display screens 15a and 15b and displayed, the underwater information can be confirmed on the display screen 15a as a normal image. By displaying up to the second and third reflected echo signals of the lake bottom, the portion where the second and third reflected echo signals are displayed is the hard lake bottom, so that the hard and soft state of the lake bottom can always be determined.
[0013]
In the description of the above embodiment, the digital echo signal amplified by the first receiving circuit 3 and stored in the first memory 9 by setting the depth from the water surface to the lake bottom by the first depth setting circuit 5. The lake bottom digital echo signal is detected by the lake bottom detection circuit 13, the normal depth in the water is set by the second depth setting circuit 6, and is input from the ultrasonic transducer 2 by the second reception circuit 4. The ultrasonic echo signal is amplified, converted into a digital echo signal by the A / D converter 8 and stored in the second memory 10, and the digital echo signal is read out from the second memory 10 by the control device 11. The detection circuit 13 detects the lake bottom digital echo signal, and inputs the lake bottom digital echo signal to the secondary (third order) arithmetic circuit 14 to calculate a multiple signal that can detect the secondary (third order) reflected echo signal. By inputting this multiple signal to the depth setting circuit 5, the depth setting circuit 5 automatically sets a depth at which a secondary (tertiary) reflected echo signal can be detected, and the first receiving circuit 3 sets the secondary (3 Next, the reflected echo signal is detected, converted into a digital echo signal by the A / D converter 7 and stored in the first memory 9, and the control device 11 receives the digital echo signal from the first and second memories 9 and 10. May be read sequentially.
[0015]
【The invention's effect】
As described above, in the fish finder of the present invention, the normal depth from the water surface to the lake bottom is set by the first or second depth setting circuit in which the depth of the reflected echo signal by one ultrasonic wave is set, A lake bottom digital echo signal is detected by the lake bottom detection circuit from the digital echo signal detected at the set depth, and a secondary (third order) reflected echo signal is detected from the lake bottom digital echo signal by a secondary (third order) arithmetic circuit. By calculating a multiple signal that can be performed, the depth of the second depth setting circuit is automatically set by the calculated multiple signal, and according to the respective depths set by the first and second depth setting circuits. The digital echo signal detected in this way can be displayed by dividing the display screen of one display device into two, and a normal image can be displayed on one of the divided screens to check underwater information. In the other split screen, the second and third reflected echo signals of the lake bottom are displayed, and the portion where the second and third reflected echo signals are displayed is the hard lake bottom. There is an advantage that the state of can be determined.
[Brief description of the drawings]
FIG. 1 is a block diagram of a fish finder according to an embodiment of the present invention.
FIG. 2 is a diagram showing a display screen of the display device of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission circuit 2 Ultrasonic transducer 3 1st receiving circuit 4 2nd receiving circuit 5 1st depth setting circuit 6 2nd depth setting circuit 7 1st A / D converter 8 2nd A / D Converter 9 First memory 10 Second memory 11 Control device 12 Display device 13 Lake bottom detection circuit 14 Secondary (tertiary) arithmetic circuit

Claims (2)

An oscillation signal is applied to one ultrasonic transducer from one transmission circuit, ultrasonic waves are irradiated from the ultrasonic transducer into the water, and a reflected wave from the water is received and displayed on the display device. In the fish finder, a first receiving circuit provided with a first depth setting circuit capable of setting a depth range in advance for a reflected wave signal received from the ultrasonic wave received by the ultrasonic transducer and a second in which the depth is automatically set The reflected echo signals received by the second receiving circuit provided with the depth setting circuit and amplified by the first and second receiving circuits are converted into digital echo signals by the first and second A / D converters, respectively. The digital echo signal is stored in the first and second memories, respectively, and the first reflected wave is detected by the lake bottom detection circuit from the digital echo signal stored in one of the first and second memories by the control device. Lake bottom digital echo And a multiple signal that can detect a secondary (third) reflected wave signal from the lake bottom digital echo signal by a secondary (tertiary) arithmetic circuit, and inputs it to the second depth setting circuit. The depth received by the second receiving circuit is automatically set by the second depth setting circuit, and the digital echo signal in the depth range set from the reflected wave signal from the ultrasonic transducer is set in the first 2, and the control device reads out the digital signals stored in the first and second memories, respectively, and divides one screen of the display device into two, which are displayed in respective depth ranges. A fish finder characterized by. The fish finder according to claim 1, wherein the first and second depth setting circuits include sensitivity setting circuits.

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