JPH04104632A - Telemeter device for fish-finder - Google Patents

Abstract

PURPOSE:To send all fish finder information at all times without missing a video image near sea bottom by providing a transmitter having a synchronizing signal generating means and a delay transmission wave timing signal generating means and a receiver provided with a reception means and a signal reproduction means to the telemeter. CONSTITUTION:A transmission wave timing signal (KP signal) delay circuit 7 provided to a transmitter 6 delays the KP signal for a time for a synchronizing signal and returns the delay KP signal of the same width of the original KP signal to a display control circuit 2. A synchronizing signal generating/control circuit 9 generates a synchronizing signal from the KP signal and controls the changeover to send the synchronizing signal and the video signal to a transmission section 10. A reception section 15 of a receiver 13 demodulates a reception signal and outputs the video signal to a display section 14 and a synchronization detection circuit 16 detects the synchronizing signal and generates a pulse signal with a prescribed width after the end of the synchronizing signal and outputs the pulse signal to the display section 14 as a pseudo KP signal. Thus, the signal just before the KP signal is not replaced into the synchronizing signal and a space time and the data by an observation time required after the KP signal is entirely sent.

Description

DETAILED DESCRIPTION OF THE INVENTION +al Industrial Application Field This invention relates to a telemeter device for a fish finder that transmits detection information of the fish finder to a remote location.

(b) Prior Art Conventionally, telemeter devices for fish finders have been put into practical use, which are used, for example, to wirelessly transmit detection information from a fish finder installed in a fixed net to a remote location such as land.

The transmitting side of a conventional telemeter device for a fish finder receives and receives an ultrasonic pulse transmission timing signal (generally called a keying pulse, hereinafter referred to as a KP double signal) and an echo video signal from the fish finder. , while synchronizing each part using the KP double signal, only the video signal was transmitted to the receiving side. Figure 5 (A) shows a timing chart of a conventional telemeter device for a fish finder. On the transmitting side of the telemeter device, the KP multiplied signal period Tl received from the fish finder is measured, and from that value the next The timing at which the KP times signal would be output was predicted. Then, a certain period of time (
tl) The video signal transmission was interrupted a while ago and a synchronization signal was sent instead. However, the KP double signal period is not completely constant, and therefore, on the receiving side, if synchronization is simply achieved only from the synchronization signal, the reproduced video will be discontinuously disturbed. Therefore, on the sending side, K
A blank time with a time width sufficient to absorb variations in P times the signal period is provided after each synchronizing signal. On the receiving side, after the synchronization signal ends, the point at which the video signal first rises is detected, and synchronization is achieved by reproducing the KP times signal from this signal.

(C) Problems to be Solved by the Invention However, the above-mentioned conventional telemeter device for fish finders had the following technical problems to be solved. In most cases, there was no necessary video signal before the KP flaw signal, so this was not a particular problem, but in recent display-type fish finders, emphasis is often placed on the video signal immediately before the KP double signal. , it is necessary to transmit all the video signals from when the KP multiplied signal is output until the next KP multiplied signal is output. As mentioned above, conventional telemeter devices for fish finders cannot easily cope with this problem.

■If the KP signal period becomes shorter and it becomes impossible to secure enough time for a synchronization signal and blank time between KP signals,
The video signal must be thinned out and transmitted, such as by transmitting a synchronization signal and blank time once every two or three times the KP double signal. FIG. 5(B) shows a timing chart in that case. In this example, even-numbered video signals such as T2 and T4 are thinned out, and only odd-numbered video signals such as TI and T3 are transmitted.

(2) Since the period of the KP signal is not completely constant, it is necessary to provide unnecessary blank time, and the amount of information to be transmitted decreases accordingly.

Due to the above reasons, the fish detection information obtained on the receiving side is different from the fish detection information obtained on the transmitting side, which causes errors in the judgment of the fish detection information on the receiving side.

An object of the present invention is to provide a telemeter device for a fish finder that can always transmit all fish finding information without omitting images immediately before the KP double signal, that is, near the seabed.

(Means for Solving Problem d1) A telemeter device for a fish finder according to the present invention includes means for generating a transmission timing signal of an ultrasonic pulse, and means for transmitting an ultrasonic pulse according to the transmission timing signal and echoes thereof. A telemeter device connected to a fish finder, comprising ultrasonic pulse transmitting/receiving means for receiving waves; Delayed transmission timing signal generation means that counts the width of the timing signal, generates a signal having a width equal to the width of the transmission timing signal as a delayed transmission timing signal after the generation of the synchronization signal is completed, and returns the signal to the fish finder. , a transmitter comprising wireless transmission means for wirelessly transmitting an echo signal together with a synchronization signal, a reception means for receiving the transmission signal from the transmitter, and a reception means for detecting the synchronization signal in the received signal and demodulating the echo signal. a receiver comprising a signal reproducing means;

te1 Effect The telemeter device for a fish finder of this invention consists of a transmitter and a receiver, the transmitter consists of a synchronization signal generating means, a delayed transmission timing signal generating means and a wireless transmitting means, and the receiver consists of a receiving means and a signal reproducing means. It consists of means.

The synchronization signal generation means generates a synchronization signal of a constant width in synchronization with the transmission timing signal (KP multiplication signal) received from the fish finder. The width of the transmitted wave timing signal (KP double signal) is counted, and after the generation of the synchronization signal is completed, a signal having a width equal to the width of the transmitted wave timing signal is generated as a delayed wave transmit timing signal, and this is sent to the fish finder. Then, the wireless transmission means wirelessly transmits the echo signal together with the synchronization signal to the transmitter.Meanwhile, the reception means receives the transmission signal from the transmitter, and the signal reproduction means detects the synchronization signal in the received signal. and demodulates the echo signal.

Therefore, the synchronization signal is followed by the transmission timing signal and the echo, and the synchronization signal does not overlap with the echo signal, and all echo signals are transmitted every time. Moreover, since the synchronization signal is created directly in accordance with the generation of the transmission timing signal, rather than predicting the period of the transmission timing signal, there is no need to provide the blank time described above. As a result, it becomes possible to transmit the amount of information obtained by the fish finder to a remote location while preserving it.

In addition, the fish finder to which the transmitter is connected receives a delayed transmission timing signal with the same width as the transmission timing signal of the ultrasonic pulse that it itself generates, and uses this delayed transmission timing signal to actually transmit and receive ultrasonic pulses. Use waves to detect schools of fish. Normally, in a fish finder, the ultrasonic emission time width is determined by the pulse width of the transmission timing signal (KP double signal).The ultrasonic emission time width must be set appropriately depending on the fish species, measurement range, etc. With the above configuration, the fish finder always transmits and receives ultrasonic pulses of appropriate width.

(fl Embodiment) FIGS. 1 and 2 show the configuration of a fish detection system using a telemeter device for a fish finder, which is an embodiment of the present invention, and a timing chart of each part thereof.

In FIG. 1, a transmitter 6 and a receiver 13 constitute a telemeter device for a fish finder, with the transmitter 6 being connected to the fish finder 1, and the receiver 13 being connected to a display section 14, respectively. A display/control circuit 2 provided in the fish finder 1 controls the timing of KP multiplication signal generation corresponding to the depth range and displays an image upon receiving the ultrasonic pulse delivery signal.

In addition, the wave transmitting/receiving circuit 3 receives the KP multiplied signal, transmits an ultrasonic pulse, receives the echo reflected by a school of fish, etc., and displays/receives the echo through the video signal output section 1) and the video signal input section 12. A video signal is output to the control circuit 2. display/
The KP multiplied signals outputted from the control circuit 2 to the KP signal output section 4 are delayed KP except for the first output after the power is turned on.
After the delayed KP multiplied signal is input to the signal input section 5, it is output after a certain period of time determined by the depth range. When the fish finder l operates as a standalone unit,
The KP multiplied signal delay from the KP signal output section 4 is directly input to the KP signal input section. In this case, a KP multiplied signal is generated at a constant period determined by the depth range, and an ultrasonic pulse is transmitted. When the transmitter 6 is connected to the fish finder 1, after the KP multiplied signal is output, a synchronization signal is generated and transmitted by the transmitter 6, and after the delayed KP multiplied signal returns, a constant value determined by the depth range is generated. After a certain period of time, the KP multiplied signal will be output again. That is, the KP multiplied signal is generated and the ultrasonic pulse is transmitted in a period equal to the fixed time determined by the depth range plus the time for generating and transmitting the synchronizing signal.

The KP signal delay circuit 7 provided in the transmitter 6 delays the KP multiplied signal by the time of the synchronization signal and returns it to the delayed KP multiplied signal display control circuit 2 having the same width as the original KP multiplied signal. A synchronization signal generation/control circuit 9 generates a synchronization signal from the KP multiplied signal, and also performs control such as switching for sending the synchronization signal and video signal to the transmitter 10. Clock circuit 8 provides a clock signal to KP signal delay circuit 7 and synchronization signal generation/control circuit 9. The transmitter 10 is a synchronization signal generator/controller 9
It receives and transmits synchronization signals and video signals from as modulation signals. The video signal output from the video signal output section 1) is transmitted from the transmission section 10 during periods other than the synchronization signal transmission period.

In the receiver 13 , a receiving section 15 demodulates the received signal and outputs a video signal to the display section 14 . The synchronization detection circuit 16 detects the synchronization signal, generates a pulse signal of a constant width after the synchronization signal ends, and converts this into a pseudo KP multiplied signal to display on the display section 1.
Output to 4. A clock circuit 17 generates a timing clock signal for synchronization detection and pseudo KP signal generation.

As the display unit 14, a fish finder similar to the normal fish finder 1 is used. That is, the signal is supplied to an input section equivalent to the delayed KP signal input section 5 in the pseudo KP double signal fish finder 1, and the timing for starting the display is determined. This display section 1
In No. 4, since it is not necessary to transmit the ultrasonic pulse by itself, there is no limit to the width of the supplied pseudo KP double signal, and the width may be constant regardless of the display depth range. Further, the video signal from the receiving section 15 is input to an input section equivalent to the video signal input section 12 in the fish finder 1, and is displayed as a video. Note that in the display section 14,
Although a component corresponding to the wave transmitting/receiving circuit 3 in the fish finder 1 is not required, the fish finder 1 is configured to be able to switch both the KP double signal video signal and display its own fish finding video using a switch circuit or the like.

In the fish finding system configured as described above, as shown in FIG. 2, the KP signal output unit 4 of the fish finder 1 outputs a KP multiplied signal at regular intervals determined by the depth range, and performs synchronization signal generation/control. The circuit 9 generates a synchronizing signal at the falling edge of this KP times signal, and the KP signal delay circuit 7 generates a delayed KP times signal with the same width as the KP times signal from the falling edge of the j signal while outputting the synchronizing signal. The circuit 3 transmits and receives ultrasonic pulses and obtains echoes as shown in FIG. 2.The transmitter 10 wirelessly transmits an echo signal together with a synchronization signal as shown in FIG.

Next, a specific circuit diagram of the KP signal circuit and a timing chart of each part thereof are shown in FIGS. 3 and 4.

In FIG. 3, 21 is an 8-bit up/down counter, which counts the rising edges of the clock input when the E input is "H". When the input signal to the U/D terminal, that is, the KP multiplied signal is “H++”, up-counting is performed and the K
Count down when the P times signal is “°L”.MA
When the X/MIN terminal is in up count mode,
When the count value is the maximum, that is, all bits and 7 bits are 1, it becomes H''°.In addition, in the down count mode, when the count value is the lowest, that is, all bits are 0.
When this happens, it becomes "H'". At other times, "L"° is output. In the figure, 22 is a flip-flop, which is set at the falling edge of the "synchronizing signal transmitting" signal, that is, when the synchronizing signal transmission is completed, until the MAX/MIN signal of the counter 21 becomes "H". The Q output, that is, the delayed KP multiplied signal is kept at "H". Furthermore, in the figure, 23 and 24 are NOR gates, and counter 2
1 count operation control. That is, only when either the KP multiplication signal or the delayed KP multiplication signal is "H", the E terminal of the counter 21 is set to "H" to enable the counting operation.When the KP multiplication signal is "H", the count value is The counter 21 is stopped when the count value reaches the maximum, and when the delayed KP multiplication signal is "L", the counter is stopped when the count value reaches 0.

The reason why the counting operation is stopped when the KP double signal reaches the maximum when the KP double signal is "H++" is that even if an abnormally wide KP double signal is input due to a circuit failure, etc. This is to output a delayed KP times signal that can operate normally.

The operation of the entire circuit shown in FIG. 3 is as follows. First, in the initial state, the KP multiplication signal is "L" and the counter value is 0. Therefore, "H" is output to MAX/MIN, the E output becomes L, and no counting operation is performed.

When the KP double signal ° becomes “H:’, MAX/MIN becomes “L”.
”, and the amplifier counts the time clock pulses until the KP multiplied signal becomes “L” as shown in FIG. This means that the KP times signal pulse width is set in the counter. At this point, the KP double signal ° is "L", but the counter value is not O, so MAX/MIN remains "L". When the transmission of the synchronization signal generated at the fall of the KP double signal ends, While the synchronization signal is being output, the j signal falls, the flip-flop 22 is set, and the delayed KP multiplication signal becomes "Ho".The counter starts counting down.When the count value reaches O due to this down counting, the That is, at the point in time when a time equal to the time width of the KP multiplied signal has been counted, MAX/MIN becomes "H" and the counting operation is stopped.Furthermore, the flip-flop 22 is also reset, and the delayed KP multiplied signal becomes "L".

As described above, after the KP double signal is input, it is delayed by the time necessary for transmitting the synchronization signal, and then returned to the fish finder as a delayed KP double signal with the same pulse width, and this delayed KP double signal Therefore, the fish finder sends out ultrasonic pulses.

(g) Effect of invention According to this invention, the following effects are achieved.

■There is no need to provide a blank time after the synchronization signal, increasing the proportion of video (echo) data transmission time in the total transmission time, improving transmission efficiency.

■Even if the depth range becomes shallow and the period of the transmission timing signal (KP double signal) becomes short (the period of the transmission timing signal (KP double signal)
The signal immediately before the double signal is not replaced by a synchronization signal or blank time, and all data for the necessary observation time after the transmission timing signal is transmitted, making it possible for the receiving side to obtain accurate fish detection information. .

■ Even if the period of the transmission timing signal (KP double signal becomes shorter, all the data observed on the transmitting side is transmitted to the receiving side without being thinned out, making it possible to obtain fish detection information with the same image quality between transmission and reception. can.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a fish finding system using a telemeter device for a fish finding device according to an embodiment of the present invention. Second
The figure is a timing chart for the fish detection system. FIG. 3 is a specific circuit diagram of the KP signal delay circuit in the embodiment, and FIG. 4 is a timing chart of each part thereof. FIGS. 5A and 5B are timing charts of a conventional fish detection telemeter device. 21-up-down counter, 22-flip-flop, 23.24-NOR gate.

Claims (1)

[Claims] (1) A fish finder equipped with a means for generating an ultrasonic pulse transmission timing signal, and an ultrasonic pulse transmission/reception means for transmitting the ultrasonic pulse according to the transmission timing signal and receiving the echo thereof. The connected telemeter device includes a synchronization signal generating means that generates a synchronization signal of a constant width in synchronization with the transmission timing signal, and a synchronization signal generation means that counts the width of the transmission timing signal and starts transmitting the transmission after the generation of the synchronization signal is completed. A delayed transmission timing signal generation means for generating a signal having a width equal to the width of the timing signal as a delayed transmission timing signal and returning it to the fish finder, and a wireless transmission means for wirelessly transmitting an echo signal together with a synchronization signal. A telemeter for a fish finder, comprising: a transmitter; a receiver comprising a receiving means for receiving a transmitted signal from the transmitter; and a signal reproducing means for detecting a synchronization signal in the received signal and demodulating an echo signal. Device.