Accession Number : ADD004775

Title :   High-Accuracy Analog Multipliers.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Bond,James W ; Whitehouse,Harper J

Report Date : 28 Sep 1977

Pagination or Media Count : 27

Abstract : An apparatus multiplies two sequences of numbers a sub i and b sub i, which may represent signal pulses of various amplitudes. A first plurality of t read-only memories (ROMs), have a common input adapted to receive the sequence of numbers of a sub i, each ROM coding the numbers a sub i into a sub j, i = a sub j modulo m sub i, 0 or = a sub j, i or = m sub i - 1. A first plurality of t digital-to-analog (D/A) converters, an input of each being connected to an output of a memory, convert the digital quantity received from the memory into its corresponding analog value. A first plurality of t means, an input of each connected to an output of a D/A converter, extend the analog signal with zero values, when required. Similar ROMs, D/A converters and extending means process the sequence numbers b sub i. A plurality of t means convolve two input analog signals, one from each of the first and second means for extending, the output of each convolving means being an analog convolved signal, approximately equal to the convolution (a sub j, i) * (b sub j, i) modulo m sub i.

Descriptors :   *Patent applications, *Electronic multipliers, *Analog computers, Accuracy, Read only memories, Sequences, Convolution

Subject Categories : Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE