JPH0227583U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is an address configuration diagram of a memory circuit for explaining writing and reading. FIG. 2 is a pixel configuration diagram of a CRT for explaining display operation. FIG. 3 is a circuit diagram showing an embodiment of this invention.

Claims (1)

[Claims for Utility Model Registration] (1) Ultrasonic pulses are repeatedly transmitted into water, and the return reflected waves are stored in the corresponding memory in the first to moth rows of a memory circuit having a memory capacity for mo rows and no columns. A write column is written to the address so that the write column changes in order every time the ultrasonic pulse is transmitted, and a part of the written memory contents is read out and the pixel of m (<mo) rows and n (<no) columns is written. In an underwater detection display device configured to display on a display, the set detection range depth a at the time of acquisition of the received signal displayed in the display start column on the display is obtained and output before the display starts. means for obtaining the seabed depth a/mo・B at the time of acquisition of the received signal displayed in the display start column on the display and outputting it before the display starts; means for obtaining each set detection range depth ay when acquiring a received signal and outputting it before each column display of the received signal; means for outputting a display distance width b on the display; It is equipped with a means for outputting a value d for selecting the dmth row of pixels, and a counting means for repeatedly counting m constant-period pulses so that the output count value at a certain moment is x, and based on each of the above values. bmo/aym・x+(a/mo・B-db)
×mo/ay is calculated, and the calculation result is set as the readout row address of the storage circuit, thereby fixing the seabed display position in the display start column on the display device to the dm-th pixel. Underwater detection display device. (2) Repeatedly transmitting ultrasonic pulses into water, and transmitting the return reflected waves to memory addresses corresponding to the first row to the mo-th row of a memory circuit having a storage capacity for mo rows and no columns, and transmitting the ultrasonic pulses The writing column is written so as to change in order every time the wave is transmitted, and a part of the written memory contents is read out and displayed on a display device consisting of m (<mo) rows and n (<no) columns of pixels. In the underwater detection device configured to display the above, means for obtaining each set detection range depth ay at the time of acquisition of each received signal displayed on the display and outputting it before each row of the received signal is displayed; Means for obtaining the seabed depth ay/mo/by at the time of acquisition of each received signal displayed on the display and outputting it before each column display of the received signal, and outputting the display distance width b on the display. and a value d for selecting a specific pixel dm row on the display.
and a counting means that repeatedly counts m constant-period pulses and whose output count value at a certain moment is x. Based on each of the above values, bmo/aym x + (ay /mo・By-d
・b) By calculating ×mo/ay and using the result of the calculation as the readout row address of the storage circuit, the seabed display position in each display column on the display device is fixed to the pixel in the dmth row. Features an underwater detection display device.