JP3925823B2

JP3925823B2 - Fish finder

Info

Publication number: JP3925823B2
Application number: JP02919698A
Authority: JP
Inventors: 繁文後藤; 義幸朝倉; 良延大窪; 健司森屋; 喜和村松
Original assignee: Honda Electronics Co Ltd
Current assignee: Honda Electronics Co Ltd
Priority date: 1998-01-27
Filing date: 1998-01-27
Publication date: 2007-06-06
Anticipated expiration: 2018-01-27
Also published as: JPH11211828A

Description

【０００１】
【産業上の利用分野】
本発明は、高周波数及び低周波数の超音波を水中に発射することにより、一方の周波数の超音波で水中の状態を表示し、他方の周波数の超音波で湖底等を表示し、第２の深度設定回路で深度を自動的に設定するようにした魚群探知機に関するものである。
【０００２】
【従来の技術】
近年、スポーツフィッシングとして盛んになっているブラックバス釣りにおいては、ブラックバスが硬質の湖底に生息していることが多いので、湖底の硬軟等の判別が重要な情報となるが、従来の単周波魚群探知機や２周波並画式魚群探知機では、水中情報、すなわち水面から湖底までの情報の表示に重きが置かれていた。
【０００３】
【発明が解決しようとする課題】
ところで、超音波を湖底に向けて発射した場合、軟質の湖底では、超音波の反射が小さいので、余程感度を良くしても、超音波の第２及び第３反射波を表示することは難しいが、硬質の湖底に向けて超音波を発射した場合には、超音波の反射波が大きいので、第２及び第３反射波を表示することができる。
【０００４】
しかしながら、従来の２周波並画式魚群探知機で超音波の第２及び第３反射波を表示して湖底の状況を詳しく知りたい場合があったとしても、湖底からの第２反射及び第３反射波まで見るために深度レンジを深くすると、水面から湖底までの画像が圧縮され、水中の状態や魚の映像が見にくくなり、又、画面をシフトして第２及び第３反射波を中心にして表示すると、水中や魚の映像が画面からはみだしてしまい、従って、水中の状態及び湖底の状態を同時に見ることができないという欠点があった。
【０００５】
【課題を解決するための手段】
本発明は、高周波送信回路に接続され、該高周波送信回路から高周波信号が印加された第１の超音波振動子と、低周波送信回路に接続され、前記低周波送信回路から低周波信号が印加された第２の超音波振動子と、前記高周波送信回路から印加された前記高周波信号によって、前記第１の超音波振動子から高周波超音波を水中に発射し、水中からの高周波反射エコーを受信する第１の受信回路と、該第１の受信回路に接続された深度範囲を設定できる第１の深度設定回路と、前記低周波送信回路から印加された低周波信号によって、第２の超音波振動子から低周波超音波を水中に発射し、水中からの低周波反射エコーを受信する第２の受信回路と、該第２の受信回路に接続された深度範囲を設定できる第２の深度設定回路と、前記第１の受信回路で受信した高周波エコー信号を高周波デシタルエコー信号に変換する第１のＡ／Ｄ変換器と、第２の受信回路で受信した低周波エコー信号を低周波デジタルエコー信号に変換する第２のＡ／Ｄ変換器と、前記第１のＡ／Ｄ変換器からの高周波デジタルエコー信号を記憶する第１のメモリと、前記第２のＡ／Ｄ変換器からの低周波デジタルエコー信号を記憶する第２のメモリと、前記第１、第２のメモリに接続された制御装置と、該制御装置に接続された表示装置と、前記制御装置に接続された湖底検出回路と、該湖底検出回路に入力端子が接続され、出力端子が第２の深度設定回路に接続された２次（３次）演算回路とからなり、前記制御装置で前記第１又は第２のメモリのいずれかに記憶されている高周波デジタルエコー信号又は低周波デジタルエコー信号のいずれかを読み出して、前記湖底検出回路で第１反射波の湖底デジタルエコー信号を検出し、該湖底デジタルエコー信号から前記２次（３次）演算回路で２次（３次）反射エコー信号を検出できる倍数信号を演算して前記第２の深度設定回路に入力することにより、前記第２の深度設定回路によって前記第２の受信回路で受信される深度を自動的に設定し、前記第２の超音波振動子からの反射エコー信号から、第２の深度設定回路で設定された深度範囲のデジタルエコー信号を前記第２のメモリに記憶し、前記制御装置で前記第１、第２のメモリに記憶された高周波デジタルエコー信号及び低周波デジタルエコーをそれぞれ読み出して前記表示装置の１つの画面を２つに分割し表示することにより、一方の周波数のデジタルエコー信号で水中の状態を表示し、他方の周波数のデジタルエコー信号で湖底の状態を表示するものであり、前記第１、第２の深度設定回路はそれぞれ個別に感度設定回路を内蔵しているものである。
【０００６】
【作用】
本発明では、高周波数の超音波と低周波数の超音波をそれぞれ水中に発射し、高周波反射エコー及び低周波反射エコーをそれぞれの超音波振動子で受信し、これらの超音波振動子からの高周波反射エコー信号及び低周波反射エコー信号を深度範囲を設定できる第１、第２の深度設定回路によって深度範囲を設定して第１、第２の受信回路で深度範囲ごとに受信してそれぞれ増幅し、第１、第２の受信回路でそれぞれ増幅された高周波反射エコー信号及び低周波反射エコー信号を第１、第２のＡ／Ｄ変換器で高周波デジタルエコー信号及び低周波デジタルエコー信号に変換して、第１、第２にメモリにそれぞれ記憶させ、制御装置で第１、第２のメモリのいずれかに記憶された高周波デジタルエコー信号又は低周波デジタルエコー信号のいずれかを読み出して、湖底検出回路で湖底デジタルエコー信号を検出し、この湖底デジタルエコー信号によって２次（３次）演算回路で２次（３次）反射波信号を検出できる倍数信号を演算して前記第１又は第２の深度設定回路に入力して深度を設定することにより、設定された深度範囲のデジタルエコー信号を第１又は第２の受信回路で受信し、第１又は第２のＡ／Ｄ変換器で高周波又は低周波デジタルエコー信号に変換して前記第１又は第２のメモリに記憶し、制御装置で第１、第２のメモリに記憶された高周波デジタルエコー信号及び低周波デジタルエコー信号を読み出して、１つの表示装置の表示画面を分割して並画することにより、一方のデジタルエコー信号を表示した画面では水面から湖底までの範囲を表示し、他方のデジタルエコー信号を表示した画面では、超音波の２次及び３次反射波を表示することにより、水中におけるブラックバスの生息と超音波の２次及び３次反射波の表示による湖底の硬質及び軟質の状態を同時に表示することができる。
【０００７】
【実施例】
図１は、本発明の１実施例の魚群探知機のブロック図で、高周波送信回路１に超音波振動子２が接続され、低周波送信回路３に超音波振動子４の入力端子が接続され、超音波振動子２に第１の受信回路５が接続され、超音波振動子４に第２の受信回路６の入力端子に接続され、これら第１、第２の受信回路５、６には深度範囲を設定できる深度設定回路７、８がそれぞれ接続され、又、第１、第２の受信回路５、６の出力端子には、第１、第２のＡ／Ｄ変換器９、１０の入力端子が接続され、さらに、第１、第２のＡ／Ｄ変換器９、１０の出力端子には、第１、第２のメモリ１１、１２が接続され、又、第１、第２のメモリ１１、１２に制御装置１３が接続され、さらに、制御装置１３の一方の出力端子に表示装置１４が接続され、又、制御装置１３の他方の端子には、湖底検出回路１５の入力端子が接続され、湖底検出回路１５の出力端子は２次（３次）演算回路１６の入力端子が接続され、２次（３次）演算回路１６の出力端子は第２の深度設定回路８の入力端子に接続され、又、それぞれの深度設定回路７、８には、個別に感度が設定される感度設定回路が内蔵されている。
【０００８】
このように構成された本実施例の魚群探知機では、高周波送信回路１から高周波信号が超音波振動子２に印加され、低周波送信回路３から超音波振動子４に低周波信号が印加されると、水中及び湖底の反射エコーが超音波振動子２、４でそれぞれ受信され、この超音波振動子２、４からの反射エコー信号は第１、第２の受信回路５、６に入力され、第１、第２の受信回路５、６で受信されて増幅された高周波反射エコー信号及び低周波反射エコー信号は、Ａ／Ｄ変換器９、１０で高周波デジタルエコー信号及び低周波デジタルエコー信号に変換されて、それぞれ第１、第２のメモリ１１、１２に記憶される。
【０００９】
ここで、第１のメモリ１１に記憶された高周波デジタルエコー信号がＣＰＵからなる制御装置１３で読み出されることにより、この高周波デジタルエコー信号から湖底検出回路１５で湖底デジタルエコー信号が検出され、この湖底デジタル信号が２次（３次）演算回路１６に入力されて２次（３次）反射信号を検出できる倍数信号を演算し、この倍数信号を第２の深度設定回路８に入力することにより、第２の深度設定回路８は、第２の受信回路６で超音波振動子４から入力される低周波反射エコー信号の湖底反射信号から後の２次又は３次反射信号を受信できる深度に自動的に設定し、第２の受信回路６で受信されて増幅された低周波反射エコー信号は第２のＡ／Ｄ変換器１０で低周波デジタルエコー信号に変換され、第２のメモリ１２に記憶される。
【００１０】
そして、このように第１、第２のメモリ１１、１２にそれぞれ記憶された高周波デジタルエコー信号及び低周波デジタルエコー信号は制御装置１３でそれぞれ順次読み出され、図２に示すように、表示装置１４の画面１７が２つの画面１７ａと１７ｂに分割されて表示され、この分割された画面１７ａには、第１の深度設定回路７で設定されるように、水面１８ａから湖底１８ｂまでの水中の状態が表示され、又、分割された画面１７ｂには、第２の深度設定回路８で設定されるように、水面１９ａと１次反射波の湖底１９ｂの他に、第２反射波による湖底１９ｃ及び第３反射波による湖底１９ｄが表示され、従って、この湖底１９ｃ及び湖底１９ｄが表示される所は硬質の湖底で、第３反射波の湖底１９ｄが表示されずに第２反射波の湖底１９ｃだけが表示される部分及び第２反射波の湖底も表示されない部分は軟質の湖底であると見なすことができる。
【００１１】
このように、本発明では、高周波送信装置１及び低周波送信装置３からそれぞれ超音波振動子２、４に高周波信号及び低周波信号を送信することにより、超音波振動子２、４によって受信された高周波反射エコー信号及び低周波エコー信号を、第１の受信回路５の深度設定回路７で通常の水中の深度を設定して受信して、第１のＡ／Ｄ変換器９で高周波デジタルエコー信号に変換して第１のメモリ１１に記憶することにより、この高周波デジタルエコー信号を制御装置１３で読み出して湖底検出回路１５で湖底デジタルエコー信号を検出し、この２次（３次）反射信号を検出できる倍数信号を演算し、この倍数信号を第２の深度設定回路８に入力することにより、第２の深度設定回路８で第２の受信回路６の受信範囲を２次（３次）デジタルエコー信号が検出できるように自動的に設定して、第２のメモリに記憶させ、第１、第２のメモリ１１、１２にそれぞれ記憶された高周波デジタルエコー信号及び低周波デジタルエコー信号を制御装置１３で読み出して、１つの表示装置１４の画面１７を表示画面１７ａ及び１７ｂに分割して表示するようにしたので、高周波信号によって表示画面１７ａには通常画像で水中情報を確認することができ、低周波信号によって表示画面１７ｂに湖底の第２、第３反射エコー信号まで表示することにより、反射エコー信号の分解能が向上し、より鮮明に湖底の硬軟の状態を表示することができ、湖底の状態をより明確に判別することができる。
【００１２】
なお、上記実施例の説明では、第１のメモリ１１に記憶された高周波デジタルエコー信号から湖底検出回路１５で湖底デジタルエコー信号を検出するようにしたが、第２の深度設定回路８で通常の水中の深度を設定し、第２の受信回路６より超音波振動子４から入力された低周波超音波エコー信号を増幅して、第２のＡ／Ｄ変換器１０で低周波デジタルエコー信号に変換して第２のメモリ１２に記憶し、第２のメモリ１２から制御装置１３でデジタルエコー信号を読み出して湖底検出回路１５で湖底デジタルエコー信号を検出し、この湖底デジタルエコー信号を２次（３次）演算回路１６に入力して２次（３次）反射エコー信号を検出できる倍数信号を演算し、この倍数信号を第１の深度設定回路７に入力することにより、第２の深度設定回路８で自動的に２次（３次）反射エコー信号を検出できる深度を設定し、第１の受信回路５で高周波２次（３次）反射エコー信号を検出して第１のＡ／Ｄ変換器９で高周波デジタルエコー信号に変換して第１のメモリ１１に記憶し、制御装置１３で第１、第２のメモリ１１、１２からデジタルエコー信号を順次読み出して表示装置１４で表示するようにしても良い。
【００１３】
【発明の効果】
以上説明したように、本発明の魚群探知機では、高周波超音波及び低周波超音波によるそれぞれの反射エコー信号を第１、第２の深度設定回路で深度を設定することによって、第１、第２の受信回路で受信し、第１、第２のＡ／Ｄ変換器で高周波デジタルエコー信号及び低周波デジタルエコー信号に変換して、第１、第２のメモリに記憶し、第１、第２のメモリに記憶された高周波デジタルエコー信号又は低周波デジタルエコー信号のいずれかから湖底検出回路で湖底デジタルエコー信号を検出し、この湖底デジタルエコー信号による倍数信号を第１又は第２の深度設定回路に入力して自動的に２次（３次）反射エコー信号を検出できる深度を設定し、第１又は第２の受信回路で２次（３次）反射エコー信号を検出して第１又は第２のＡ／Ｄ変換器でデジタルエコー信号に変換して第１又は第２のメモリに記憶し、第１、第２のメモリに記憶された高周波デジタルエコー信号及び低周波デジタルエコー信号を制御装置で読み出して１つの表示装置の表示画面を２つに分割して表示し、一方の分割画面には通常画像を表示して水中情報を確認することができ、又、他方の分割画面では、湖底の第２、第３反射エコー信号まで表示することによって、低周波超音波による第２、第３反射エコーが表示された部分が硬質の湖底であることから常に湖底の硬軟の状態を判別することができるという利点がある。
【図面の簡単な説明】
【図１】本発明の１実施例の魚群探知機のブロック図である。
【図２】図１の表示装置の表示画面を示した図である。
【符号の説明】
１高周波送信回路
２超音波振動子
３低周波送信回路
４超音波振動子
５第１の受信回路
６第２の受信回路
７第１の深度設定回路
８第２の深度設定回路
９第１のＡ／Ｄ変換器
１０第２のＡ／Ｄ変換器
１１第１のメモリ
１２第２のメモリ
１３制御装置
１４表示装置
１５湖底検出回路
１６２次（３次）演算回路[0001]
[Industrial application fields]
The present invention emits high frequency and low frequency ultrasonic waves into the water, displays the state of the water with ultrasonic waves of one frequency, displays the bottom of the lake etc. with ultrasonic waves of the other frequency, The present invention relates to a fish finder in which a depth is automatically set by a depth setting circuit.
[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 is connected to a first ultrasonic transducer connected to a high-frequency transmission circuit, to which a high-frequency signal is applied from the high -frequency transmission circuit, and connected to a low-frequency transmission circuit, and a low-frequency signal is applied from the low-frequency transmission circuit. The high-frequency ultrasonic wave is emitted from the first ultrasonic transducer into the water and the high-frequency reflection echo is received from the water by the second ultrasonic transducer and the high-frequency signal applied from the high-frequency transmission circuit. first and receiving circuit for a first depth setting circuit which can set the connected depth range to the first receiving circuit, the low-frequency signal applied from the low frequency transmission circuit, a second ultrasonic He fired low-frequency ultrasonic waves into the water from the oscillator, a low frequency and a second receiving circuit for receiving a reflected echo, the second depth setting that can be set connected depth range to the second receiving circuit from water Circuit and said first reception A first A / D converter that converts a high-frequency echo signal received on the road into a high-frequency digital echo signal, and a second A that converts a low-frequency echo signal received by the second receiving circuit into a low-frequency digital echo signal / D converter, a first memory for storing a high frequency digital echo signal from the first A / D converter, and a first memory for storing a low frequency digital echo signal from the second A / D converter. 2 memory , a control device connected to the first and second memories, a display device connected to the control device, a lake bottom detection circuit connected to the control device, and an input to the lake bottom detection circuit A secondary (tertiary) arithmetic circuit having a terminal connected and an output terminal connected to a second depth setting circuit is stored in either the first memory or the second memory by the control device. High frequency digital echo signal or low frequency One of the digital echo signals is read out, the lake bottom digital echo signal of the first reflected wave is detected by the lake bottom detection circuit, and the secondary (tertiary) operation circuit detects the lake bottom digital echo signal from the lake bottom digital echo signal. A depth signal received by the second receiving circuit is automatically set by the second depth setting circuit by calculating a multiple signal capable of detecting a reflected echo signal and inputting it to the second depth setting circuit. , from the reflected echo signal from the second ultrasonic transducer, a digital echo signal set depth range in the second depth setting circuit stored in said second memory, the first at the control device, The high frequency digital echo signal and the low frequency digital echo stored in the second memory are read out respectively, and one screen of the display device is divided into two parts and displayed. The underwater state is displayed with a tall echo signal, and the state of the lake bottom is displayed with a digital echo signal of the other frequency. Each of the first and second depth setting circuits has a built-in sensitivity setting circuit . Is.
[0006]
[Action]
In the present invention, high-frequency ultrasonic waves and low-frequency ultrasonic waves are emitted into water, high-frequency reflected echoes and low-frequency reflected echoes are received by the respective ultrasonic transducers, and high-frequency waves from these ultrasonic transducers are received. The depth range is set by the first and second depth setting circuits that can set the depth range for the reflected echo signal and the low-frequency reflected echo signal, and the first and second receiving circuits receive and amplify the depth range respectively. The first and second A / D converters convert the high frequency reflected echo signal and the low frequency reflected echo signal amplified by the first and second receiving circuits, respectively, into a high frequency digital echo signal and a low frequency digital echo signal. The high frequency digital echo signal or the low frequency digital echo signal stored in the first or second memory by the control device and stored in the first or second memory respectively. , The lake bottom digital echo signal is detected by the lake bottom detection circuit, and a multiple signal that can detect the secondary (third order) reflected wave signal by the secondary (third order) arithmetic circuit is calculated by the lake bottom digital echo signal, By inputting to the first or second depth setting circuit and setting the depth, the digital echo signal in the set depth range is received by the first or second receiving circuit, and the first or second A / A high frequency digital echo signal and a low frequency digital echo signal converted into a high frequency or low frequency digital echo signal by a D converter and stored in the first or second memory, and stored in the first or second memory by a control device. By reading the signal and dividing the display screen of one display device in parallel, the screen displaying one digital echo signal displays the range from the water surface to the bottom of the lake, and the other digital On the screen displaying the signal, the secondary and tertiary reflected waves of the ultrasonic waves are displayed, so that the black bass inhabits underwater and the hard and soft state of the lake bottom due to the display of the secondary and tertiary reflected waves of the ultrasonic waves. Can be displayed simultaneously.
[0007]
【Example】
FIG. 1 is a block diagram of a fish finder according to an embodiment of the present invention, in which an ultrasonic transducer 2 is connected to a high frequency transmission circuit 1 and an input terminal of the ultrasonic transducer 4 is connected to a low frequency transmission circuit 3. The first receiving circuit 5 is connected to the ultrasonic transducer 2, the input terminal of the second receiving circuit 6 is connected to the ultrasonic transducer 4, and the first and second receiving circuits 5 and 6 include Depth setting circuits 7 and 8 capable of setting the depth range are connected to each other, and the output terminals of the first and second receiving circuits 5 and 6 are connected to the first and second A / D converters 9 and 10, respectively. The input terminals are connected, and the first and second memories 11 and 12 are connected to the output terminals of the first and second A / D converters 9 and 10, and the first and second memories are connected to each other. A control device 13 is connected to the memories 11 and 12, and a display device 14 is connected to one output terminal of the control device 13. The other terminal of the device 13 is connected to the input terminal of the lake bottom detection circuit 15 and the output terminal of the lake bottom detection circuit 15 is connected to the input terminal of the secondary (tertiary) arithmetic circuit 16 to the secondary (tertiary). The output terminal of the arithmetic circuit 16 is connected to the input terminal of the second depth setting circuit 8, and each depth setting circuit 7, 8 has a sensitivity setting circuit in which sensitivity is individually set.
[0008]
In the fish finder of this embodiment configured as described above, a high frequency signal is applied from the high frequency transmission circuit 1 to the ultrasonic transducer 2, and a low frequency signal is applied from the low frequency transmission circuit 3 to the ultrasonic transducer 4. Then, the reflected echoes of the water and the lake bottom are received by the ultrasonic transducers 2 and 4, respectively, and the reflected echo signals from the ultrasonic transducers 2 and 4 are input to the first and second receiving circuits 5 and 6. The high-frequency reflected echo signal and the low-frequency reflected echo signal received and amplified by the first and second receiving circuits 5 and 6 are converted into a high-frequency digital echo signal and a low-frequency digital echo signal by the A / D converters 9 and 10, respectively. And stored in the first and second memories 11 and 12, respectively.
[0009]
Here, the high frequency digital echo signal stored in the first memory 11 is read out by the control device 13 comprising a CPU, whereby the lake bottom digital echo signal is detected by the lake bottom detection circuit 15 from this high frequency digital echo signal. A digital signal is input to the secondary (third order) arithmetic circuit 16 to calculate a multiple signal that can detect the secondary (third order) reflected signal, and this multiple signal is input to the second depth setting circuit 8. The second depth setting circuit 8 is automatically set to a depth at which the second-order or third-order reflected signal can be received from the lake bottom reflected signal of the low-frequency reflected echo signal input from the ultrasonic transducer 4 by the second receiving circuit 6. The low frequency reflected echo signal received and amplified by the second receiving circuit 6 is converted into a low frequency digital echo signal by the second A / D converter 10 and stored in the second memory 12. It is 憶.
[0010]
Then, the high-frequency digital echo signal and the low-frequency digital echo signal stored in the first and second memories 11 and 12 in this manner are sequentially read out by the control device 13, respectively. As shown in FIG. 14 screens 17 are divided and displayed on two screens 17a and 17b. In this divided screen 17a, as set by the first depth setting circuit 7, the underwater from the water surface 18a to the lake bottom 18b is displayed. The state is displayed, and on the divided screen 17b, as set by the second depth setting circuit 8, in addition to the water surface 19a and the lake bottom 19b of the primary reflected wave, the lake bottom 19c by the second reflected wave is displayed. And the lake bottom 19d by the third reflected wave is displayed. Therefore, the place where the lake bottom 19c and the lake bottom 19d are displayed is the hard lake bottom, and the lake bottom 19d of the third reflected wave is not displayed and the lake bottom of the second reflected wave is displayed. Parts and lakebed also not displayed portion of the second reflected wave 9c only display can be viewed as a lake bottom soft.
[0011]
As described above, in the present invention, the high-frequency transmitter 1 and the low-frequency transmitter 3 transmit the high-frequency signal and the low-frequency signal to the ultrasonic transducers 2 and 4, respectively. The high frequency reflected echo signal and the low frequency echo signal are received by the depth setting circuit 7 of the first receiving circuit 5 with the normal underwater depth set, and the first A / D converter 9 receives the high frequency digital echo. By converting the signal into a signal and storing it in the first memory 11, the high frequency digital echo signal is read out by the control device 13, the lake bottom detection circuit 15 detects the lake bottom digital echo signal, and this secondary (tertiary) reflected signal is detected. Is calculated, and the multiple signal is input to the second depth setting circuit 8, so that the second depth setting circuit 8 sets the reception range of the second receiving circuit 6 to the secondary (tertiary). Digital A control device that automatically sets the code signal so that it can be detected and stores it in the second memory, and stores the high-frequency digital echo signal and the low-frequency digital echo signal stored in the first and second memories 11 and 12, respectively. 13, since the screen 17 of one display device 14 is divided into the display screens 17 a and 17 b for display, underwater information can be confirmed on the display screen 17 a by a normal image by a high-frequency signal, By displaying up to the second and third reflected echo signals of the lake bottom on the display screen 17b by the low frequency signal, the resolution of the reflected echo signal is improved, and the hard and soft state of the lake bottom can be displayed more clearly. The state can be determined more clearly.
[0012]
In the description of the above embodiment, the lake bottom digital echo signal is detected by the lake bottom detection circuit 15 from the high frequency digital echo signal stored in the first memory 11. The underwater depth is set, the low frequency ultrasonic echo signal input from the ultrasonic transducer 4 from the second receiving circuit 6 is amplified, and the second A / D converter 10 converts it into a low frequency digital echo signal. The converted signal is stored in the second memory 12, the digital echo signal is read out from the second memory 12 by the control device 13, the lake bottom digital echo signal is detected by the lake bottom detection circuit 15, and this lake bottom digital echo signal is secondarily ( A multiple signal that can be input to the (third-order) arithmetic circuit 16 to detect the secondary (third-order) reflected echo signal is calculated, and this multiple signal is input to the first depth setting circuit 7, thereby setting the second depth. Times The depth at which the secondary (tertiary) reflected echo signal can be automatically detected is set at 8, and the first receiving circuit 5 detects the high frequency secondary (tertiary) reflected echo signal to perform the first A / D conversion. The high frequency digital echo signal is converted by the device 9 and stored in the first memory 11, and the digital echo signal is sequentially read out from the first and second memories 11 and 12 by the control device 13 and displayed on the display device 14. May be.
[0013]
【The invention's effect】
As described above, in the fish finder of the present invention, the first and second depth setting circuits set the depths of the reflected echo signals by the high frequency ultrasonic waves and the low frequency ultrasonic waves by the first and second depth setting circuits. 2 and received by the first and second A / D converters, converted into a high-frequency digital echo signal and a low-frequency digital echo signal, stored in the first and second memories, The lake bottom digital echo signal is detected by the lake bottom detection circuit from either the high frequency digital echo signal or the low frequency digital echo signal stored in the memory 2 and the multiple signal based on the lake bottom digital echo signal is set to the first or second depth setting. A depth at which the secondary (tertiary) reflected echo signal can be automatically detected by being input to the circuit is set, and the first or second receiving circuit detects the secondary (tertiary) reflected echo signal to detect the first or second Second A / D The digital echo signal is converted by the converter and stored in the first or second memory, and 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, The display screen of the display device is divided into two and displayed. One of the divided screens can display a normal image to check underwater information. In the other divided screen, the second and second of the lake bottom are displayed. By displaying up to three reflected echo signals, the portion where the second and third reflected echoes by low frequency ultrasonic waves are displayed is a hard lake bottom, so that the hard and soft state of the lake bottom can always be distinguished. is there.
[Brief description of the drawings]
FIG. 1 is a block diagram of a fish finder according to an embodiment of the present invention.
2 is a diagram showing a display screen of the display device of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High frequency transmission circuit 2 Ultrasonic transducer 3 Low frequency transmission circuit 4 Ultrasonic transducer 5 1st receiving circuit 6 2nd receiving circuit 7 1st depth setting circuit 8 2nd depth setting circuit 9 1st A / D converter 10 Second A / D converter 11 First memory 12 Second memory 13 Control device 14 Display device 15 Lake bottom detection circuit 16 Secondary (tertiary) arithmetic circuit

Claims

高周波送信回路に接続され、該高周波送信回路から高周波信号が印加された第１の超音波振動子と、低周波送信回路に接続され、前記低周波送信回路から低周波信号が印加された第２の超音波振動子と、前記高周波送信回路から印加された前記高周波信号によって、前記第１の超音波振動子から高周波超音波を水中に発射し、水中からの高周波反射エコーを受信する第１の受信回路と、該第１の受信回路に接続された深度範囲を設定できる第１の深度設定回路と、前記低周波送信回路から印加された低周波信号によって、第２の超音波振動子から低周波超音波を水中に発射し、水中からの低周波反射エコーを受信する第２の受信回路と、該第２の受信回路に接続された深度範囲を設定できる第２の深度設定回路と、前記第１の受信回路で受信した高周波エコー信号を高周波デシタルエコー信号に変換する第１のＡ／Ｄ変換器と、第２の受信回路で受信した低周波エコー信号を低周波デジタルエコー信号に変換する第２のＡ／Ｄ変換器と、前記第１のＡ／Ｄ変換器からの高周波デジタルエコー信号を記憶する第１のメモリと、前記第２のＡ／Ｄ変換器からの低周波デジタルエコー信号を記憶する第２のメモリと、前記第１、第２のメモリに接続された制御装置と、該制御装置に接続された表示装置と、前記制御装置に接続された湖底検出回路と、該湖底検出回路に入力端子が接続され、出力端子が第２の深度設定回路に接続された２次（３次）演算回路とからなり、前記制御装置で前記第１又は第２のメモリのいずれかに記憶されている高周波デジタルエコー信号又は低周波デジタルエコー信号のいずれかを読み出して、前記湖底検出回路で第１反射波の湖底デジタルエコー信号を検出し、該湖底デジタルエコー信号から前記２次（３次）演算回路で２次（３次）反射エコー信号を検出できる倍数信号を演算して前記第２の深度設定回路に入力することにより、前記第２の深度設定回路によって前記第２の受信回路で受信される深度を自動的に設定し、前記第２の超音波振動子からの反射エコー信号から、第２の深度設定回路で設定された深度範囲のデジタルエコー信号を前記第２のメモリに記憶し、前記制御装置で前記第１、第２のメモリに記憶された高周波デジタルエコー信号及び低周波デジタルエコーをそれぞれ読み出して前記表示装置の１つの画面を２つに分割し表示することにより、一方の周波数のデジタルエコー信号で水中の状態を表示し、他方の周波数のデジタルエコー信号で湖底の状態を表示することを特徴とする魚群探知機。A first ultrasonic transducer connected to a high-frequency transmission circuit and applied with a high-frequency signal from the high-frequency transmission circuit, and a second ultrasonic transducer connected to a low-frequency transmission circuit and applied with a low-frequency signal from the low-frequency transmission circuit The first ultrasonic transducer emits a high frequency ultrasonic wave from the first ultrasonic transducer into the water and receives a high frequency reflection echo from the water by the high frequency signal applied from the high frequency transmission circuit . a receiving circuit, a first depth setting circuit which can set the connected depth range to the first receiving circuit, from the by the low-frequency signal applied from the low frequency transmission circuit, the second ultrasonic vibrator low fired frequency ultrasound in water, a second receiving circuit for receiving a low frequency echo reflected from the water, a second depth setting circuit which can set the connected depth range to the second receiving circuit, wherein Received by the first receiving circuit A first A / D converter that converts the high-frequency echo signal into a high-frequency digital echo signal, and a second A / D converter that converts the low-frequency echo signal received by the second receiving circuit into a low-frequency digital echo signal , A first memory for storing the high frequency digital echo signal from the first A / D converter, and a second memory for storing the low frequency digital echo signal from the second A / D converter When the first, and a control device connected to the second memory, and a display device connected to the control device, and the lake bottom detection circuit connected to the control unit, the input terminal is connected to該湖bottom detection circuit And a high-frequency digital echo stored in either the first or second memory in the control device, the output terminal comprising a secondary (tertiary) arithmetic circuit connected to the second depth setting circuit. Signal or low frequency digital One of the core signals is read out, the lake bottom digital echo signal of the first reflected wave is detected by the lake bottom detection circuit, and the secondary (third order) reflection from the lake bottom digital echo signal by the secondary (third order) arithmetic circuit. By calculating a multiple signal capable of detecting an echo signal and inputting it to the second depth setting circuit, the depth received by the second receiving circuit is automatically set by the second depth setting circuit, from the reflected echo signal from the second ultrasonic transducer, a digital echo signal set depth range in the second depth setting circuit stored in said second memory, the first at the control device, the The high-frequency digital echo signal and the low-frequency digital echo stored in the memory 2 are respectively read out, and one screen of the display device is divided into two parts and displayed. A fish finder characterized by displaying the underwater state with a signal and displaying the state of the lake bottom with a digital echo signal of the other frequency.

前記第１、第２の深度設定回路はそれぞれ個別に感度設定回路を内蔵していることを特徴とする請求項１記載の魚群探知機。2. The fish finder according to claim 1, wherein each of the first and second depth setting circuits includes a sensitivity setting circuit .