Sonar signal selection circuit - has pulse counter and address unit with signal and buffer memories and logic circuit to eliminate largest echo response

摘要

The sonar signal system consists of an antenna (1), a channel former (2) an adapter assembly (3), a tuning circuit (5) and a visual display unit (4). The tuning and selecting circuit (5) incorporates a memory and a counter to locate the address of the signals received. There are also a gate unit and a numerical-analogue converter. Four buffer memories are included, two in series in each of the two parallel lines, and those work in conjunction with a logic comparator. The largest echo signal is automatically eliminated from the visual display.