Accession Number : ADD002407

Title :   Divers Navigation Display.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Medrano,Alfred M

Report Date : 16 Dec 1975

Pagination or Media Count : 6

Abstract : A digital circuit for computing unknown angle theta comprises first and second programmable read-only-memories (PROMS) each outputting an eight-bit representation of the logarithm of respective digital inputs representing K sin theta and K cos theta respectively. Second PROMS each output the two's compliment of the logarithm respective digital inputs, a pair of adders connected to the PROMS produce an output corresponding to the logarithm of tangent theta, another pair of PROMS are connected to the adders and are programmed as look-up tables to produce outputs corresponding to theta. A latch circuit and digital-to-analog convertor complete the novel circuit.

Descriptors :   *Navigation computers, *Diver equipment, *Data processing equipment, *Patents, Digital to analog converters, Read only memories, Homing devices, Angles

Subject Categories : Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE