JPH11211826A - Fish detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously display inhabit of fish in water and a hard and soft conditions of lake bottom by setting the depth of the respective reflection echo due to high frequency ultrasonic wave and low frequency ultrasonic wave, and dividedly displaying them on a display screen. SOLUTION: When a high frequency signal is impressed from a transmitting circuit 1 on an ultrasonic vibrator 2, and a low frequency signal is impressed from a transmitting circuit 3 on an ultrasonic vibrator 4, reflection echo in the water and the lake bottom are respectively received by the ultrasonic vibrators 2, 4, and the reflection echo from the ultrasonic vibrators 2, 4 are input to receiving circuits 5, 6. The receiving circuits 5, 6 are respectively connected to depth setting circuits 7, 8, and depth is set so that the receiving circuit 5 receives the high frequency reflection echo signal from the water surface to the lake bottom, and the receiving circuit 6 receives the low frequency relection echo signal from the lake bottom. By setting depth of high frequency and low frequency reflection echo signals received from the ultrasonic vibrators 2, 4 by the respective depth setting circuits 7,8 and receiving them, the screen of a display device 14 is divided int two and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic wave of one frequency which emits high-frequency and low-frequency ultrasonic waves into water to display the state of the underwater, and an ultrasonic wave of the other frequency displays the bottom of a lake or the like. The present invention relates to a fish finder which is divided into two and displayed.

[0002]

2. Description of the Related Art In recent years, in black bass fishing, which has become popular as sport fishing, since black bass often live on a hard lake bottom, it is important to determine the hardness of the lake bottom, etc. In the conventional single-frequency fish finder and dual-frequency parallel fish finder, the emphasis has been placed on displaying underwater information, that is, information from the water surface to the lake bottom.

[0003]

By the way, when ultrasonic waves are emitted toward the bottom of the lake, the reflection of the ultrasonic waves is small on the soft bottom of the lake.
And it is difficult to display the third reflected wave, but when the ultrasonic wave is emitted toward the hard lake bottom, the reflected wave of the ultrasonic wave is large, so that the second and third reflected waves can be displayed. .

[0004] However, even if it is desired to know the state of the lake bottom 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 from the lake bottom may be required. If the depth range is increased to see the third reflected wave, the image from the water surface to the lake bottom is compressed, making it difficult to see the underwater condition and the image of the fish, and shifting the screen to reduce the second and third reflected waves. If the image is displayed in the center, the image of the underwater or the fish protrudes from the screen, so that there is a drawback that the state of the underwater and the state of the lake bottom cannot be seen at the same time.

[0005]

According to the present invention, a high-frequency signal and a low-frequency signal are applied to an ultrasonic vibrator connected to a high-frequency transmitting circuit and a low-frequency transmitting circuit, respectively. First and second depth-circuits for emitting sound waves and low-frequency ultrasonic waves into water and connecting high-frequency reflection echoes and low-frequency reflection echoes from the water received by the ultrasonic vibrator to set a depth range. The first and second A / D converters respectively receive a high-frequency reflected echo signal and a low-frequency reflected echo signal amplified by the first and second receiving circuits. And converts the high-frequency digital echo signal and the low-frequency digital echo signal into first and second memories, respectively, and the controller stores the first and second notes. The high-frequency digital echo signal and the low-frequency digital echo signal stored in the memory are read out, and one screen of the display device is divided into two, and the underwater state is displayed by the digital echo signal of one frequency, and the other frequency is used. The state of the lake bottom is displayed by the digital echo signal of the above.

[0006]

According to the present invention, high-frequency ultrasonic waves and low-frequency ultrasonic waves are respectively emitted into water, and high-frequency reflected echoes and low-frequency reflected echoes are received by respective ultrasonic transducers. The first and second receiving circuits whose depth ranges are set by a depth setting circuit that can set a depth range receive and amplify the high frequency reflection echo signal and the low frequency reflection echo signal from the first and second reception circuits, respectively. The high-frequency reflection echo signal and the low-frequency reflection echo signal amplified by the second receiving circuit are converted into a high-frequency digital echo signal and a low-frequency digital echo signal by first and second A / D converters. Second, the high frequency digital echo signal and the low frequency digital echo signal stored in the first and second memories are read out by the control device,
By dividing the display screen of one display device and juxtaposing, a screen displaying a digital echo signal of one frequency displays a range from the water surface to the lake bottom, and a screen displaying a digital echo signal of the other frequency. Then, the second ultrasonic
By displaying the third reflected wave, it is possible to simultaneously display the inhabitation of the black bath in water and the hard and soft states of the lake bottom by displaying the second and third reflected waves of the ultrasonic waves.

[0007]

FIG. 1 is a block diagram of a fish finder according to one embodiment of the present invention. An ultrasonic transducer 2 is connected to a transmission circuit 1, and FIG.
The ultrasonic vibrator 4 is connected to the transmitting circuit 3 and connected to the input terminals of the first and second receiving circuits 5 and 6. The first and second receiving circuits 5 and 6 have a depth range. Depth setting circuits 7 and 8 that can be set are connected respectively, and
Output terminals of the second receiving circuits 5 and 6 are provided with first and second A
The input terminals of the A / D converters 9 and 10 are connected, and the output terminals of the first and second A / D converters 9 and 10 are connected to the first and second memories 11 and 12, respectively. Further, a control device 13 is connected to the first and second memories 11 and 12, and a display device 14 is connected to the control device 13.

In the fish finder of the present embodiment configured as described above, a high frequency signal is applied from the transmission circuit 1 to the ultrasonic vibrator 2, and a low frequency signal is applied from the transmission circuit 3 to the ultrasonic vibrator 4. Then, the reflected echoes of the underwater and the lake bottom are received by the ultrasonic transducers 2 and 4, respectively.
The first and second receiving circuits 5, 6
Is input to

Here, since the first and second receiving circuits 5 and 6 are connected to the depth setting circuits 7 and 8, respectively, the first receiving circuit 5 has a high-frequency reflection from the water surface to the lake bottom. The depth range is set by the depth setting circuit 7 so that the echo signal is input, and the second receiving circuit 8 receives the second and third low-frequency reflection echo signals from the lake bottom. The sensitivity is set by the depth setting circuit 8, and each of the depth setting circuits 7 and 8 has a built-in sensitivity setting circuit for individually setting the sensitivity.

The high-frequency reflection echo signal and the low-frequency reflection echo signal received and amplified by the first and second receiving circuits 5 and 6 are converted by the A / D converters 9 and 10 into high-frequency digital echo signals. Signal and a low-frequency digital echo signal, and converted into first and second memories 11 and 12, respectively.
Is stored.

The high-frequency digital echo signal and the low-frequency digital echo signal stored in the first and second memories 11 and 12 are sequentially read out by a control device 13 comprising a CPU, as shown in FIG. Display device 1
4 is divided into two screens 15a and 15b, and the divided screen 15a displays the underwater state from the water surface 16a to the lake bottom 16b as set by the depth setting circuit 7. Screen 15b
The water surface 17a as set by the depth setting circuit 8.
In addition to the lake bottom 17b of the primary reflected wave and the lake bottom 17c of the secondary reflected wave and the lake bottom 17d of the tertiary reflected wave,
Accordingly, the place where the lake bottom 17c and the lake bottom 17d are displayed is a hard lake bottom, and the part where only the lake bottom 17c of the secondary reflected wave is displayed without displaying the lake bottom 17d of the tertiary reflected wave and 2
The part where the lake bottom of the next reflected wave is not displayed can be regarded as a soft lake bottom.

As described above, according to the present invention, the transmitting devices 1, 3
To transmit the high-frequency signal and the low-frequency signal to the ultrasonic vibrators 2 and 4, respectively, so that the high-frequency reflected echo signal and the low-frequency echo signal received by the ultrasonic vibrators 2 and 4 are transmitted to the first and second ultrasonic vibrators. Since the depth setting circuits 7 and 8 of the receiving circuits 5 and 6 set and receive the depth, the screen 15 of one display device 14 is divided and displayed on the display screens 15a and 15b. For example,
The directivity angle is narrow and the display screen 15 is
In a, the underwater information can be confirmed in a normal image, and the display screen 1 is formed by a low-frequency signal having a wide directional angle and low attenuation.
By displaying the secondary and tertiary reflected echo signals of the lake bottom in 5b, the resolution of the reflected echo signal is improved, and the hard and soft state of the lake bottom can be displayed more clearly, and the state of the lake bottom can be determined more clearly. There is an advantage that can be. .

[0013] In the above embodiment. Underwater condition is displayed by high frequency ultrasonic wave, and secondary and 3rd of lake bottom is displayed by low frequency ultrasonic wave.
Next, the reflected echo signal is displayed. However, the underwater state may be displayed using low-frequency ultrasonic waves, and the secondary and tertiary reflection of the lake bottom may be displayed using high-frequency ultrasonic waves.

As described above, in the fish finder according to the present invention, the depth of each of the reflected echo signals of the high-frequency ultrasonic wave and the low-frequency ultrasonic wave is set, so that the display screen of one display device can be displayed in two. In one split screen, a normal image can be displayed to check underwater information. In the other split screen, the second and third lake bottoms can be viewed.
By displaying even the reflected echo signal, the second and third
Since the portion where the reflected echo signal is displayed is a hard lake bottom, there is an advantage that the hard / soft state of the lake bottom can always be determined.

[Brief description of the drawings]

FIG. 1 is a block diagram of a fish finder according to one embodiment of the present invention.

FIG. 2 is a diagram showing a display screen of the display device of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmission circuit 2 ultrasonic transducer 3 transmission circuit 4 ultrasonic transducer 5 first receiving circuit 6 second receiving circuit 7 first depth setting circuit 8 second depth setting circuit 9 first A / D conversion Device 10 Second A / D converter 11 First memory 12 Second memory 13 Control device 14 Display device

 ──────────────────────────────────────────────────の Continued on front page (72) Inventor Kenji Moriya 20 Oyama-cho, Oiwa-cho, Toyohashi-city, Aichi Prefecture Inside Honda Electronics Co., Ltd. Honda Electronics Co., Ltd.

Claims (2)

[Claims] A high-frequency signal and a low-frequency signal are applied to ultrasonic transducers connected to a high-frequency transmission circuit and a low-frequency transmission circuit, respectively, and high-frequency ultrasonic waves and low-frequency ultrasonic waves are respectively transmitted from the ultrasonic transducers to the underwater. The first and second receiving circuits respectively connected to a depth setting circuit capable of setting a depth range receive high-frequency reflection echoes and low-frequency reflection echoes from underwater received by the ultrasonic transducer, 1st, 2nd
The first and second A / D converters respectively convert the high-frequency reflection echo signal and the low-frequency reflection echo signal amplified by the receiving circuit into a high-frequency digital echo signal and a low-frequency digital echo signal, respectively. And the low-frequency digital echo signal are stored in first and second memories, respectively, and the control device reads out and displays the high-frequency digital echo signal and the low-frequency digital echo signal stored in the first and second memories, respectively. A fish finder, wherein one screen of the device is divided into two, and a state of underwater is displayed by a digital echo signal of one frequency, and a state of a lake bottom is displayed by a digital echo signal of the other frequency. 2. The fish finder according to claim 1, wherein said depth setting device has a built-in sensitivity setting device.