US 4,397,008 AGranted

Echo sounder with CRT display

AssigneeFried. Krupp Gesellschaft mit beschankter Haftung

InventorRolf Ziese

Life of this patent

Estimating the term…

Loading patent…

Abstract

In an echo sounder including a cathode-ray tube display device for providing a visual display in the form of a succession of image frames each composed of a series of image lines extending in a first direction on the display and spaced apart in a second direction on the display, with each line being composed of a plurality of image points, and a memory having a number of addressable memory locations equal to at least the number of image points in each frame, with a representation of each image point being stored at a respective memory location, the memory is an addressable read-write random access memory, and the device includes circuitry connected for causing each memory location address to consist of a first part identifying the location of one image line in the second direction on the display and a second part identifying the location of one image point along any line in the first direction on the display, an address counter producing an output representing the address part corresponding to one direction, a sounding period counter connected to operate in synchronism with the address counter and producing a count output representing the address part corresponding to the other direction, and write-in control elements connected for producing a write-in control signal which causes the memory to be addressed by the counter outputs and a received signal sample to be written-in to the addressed memory location during each line or frame retrace period.

In an echo sounder including a cathode-ray tube display device including circuitry for providing a visual display in the form of a succession of image frames separated by frame retrace periods and each composed of a series of image elements in the form of lines separated by line retrace periods and extending in a first direction on the display and spaced apart in a second direction on the display, with each line being composed of a plurality of image elements in the form of points, a memory having a plurality of addressable memory locations equal in number to at least the total number of image points in each frame, with the value of each image point being stored in digital form at a respective memory location, and write-in means connected to the memory for storing signal sample values received by the echo sounder, the improvement wherein:

said memory is an addressable read-write random access memory;
said circuitry is connected for causing each memory location address to consist of two parts constituted by a first part identifying the location of one image line in the second direction on the display and a second part identifying the relative location of one image point along any line in the first direction on the display, said write-in means comprise an address counter having a counting capacity corresponding to the number of image elements in one direction on the display and producing a count output representing the address part corresponding to the one direction, a sounding period counter connected to operate in synchronism with said address counter, having a count capacity corresponding to the number of image elements in the other direction on the display, and producing a count output representing the address part corresponding to the other direction, and write-in control means connected for producing a write-in control signal which causes said memory to be addressed by said counter outputs and a received signal sample to be written-in to the addressed memory location during each line or frame retrace period.

Abstract

Claims17