Henry M Bell

US Patent:

42020425, May 6, 1980

Filed:

Jul 5, 1977

Appl. No.:

5/813038

Inventors:

John P. Connors - Silver Spring MD
Bernard J. Nordmann - Bronx NY
David M. Wainland - Cardiff NJ
Henry P. Bell - Laurel MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H03K 13175

US Classification:

364900

Abstract:

Interface circuitry for obtaining simultaneous, multi-channel analog outputs from a microprocessor, avoiding sequential addressing delays. The technique involves inserting, for each analog output channel, a buffer latch between the data bus lines from the microprocessor and the D/A latch associated with the D/A converter. The buffer latches are sequentially addressed by control logic circuitry and loaded from the computer memory in accordance with software instructions in the microprocessor. While data is being loaded in the buffer latches, the D/A latches are disabled, preventing the data from being presented to the D/A converters. When all channels are loaded, the D/A latches are strobed simultaneously, enabling them and transferring the data stored in the buffer latches to the D/A converters for conversion to analog outputs.

US Patent:

41562860, May 22, 1979

Filed:

Nov 16, 1977

Appl. No.:

5/852186

Inventors:

John P. Connors - Silver Spring MD
Henry P. Bell - Laurel MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G11C 1300
G11C 1140

US Classification:

365 45

Abstract:

A solid state data recording system for storing multichannel analog data. is low power system has characteristics similar to a high performance analog tape recorder but has no moving parts and can be easily ruggedized for severe environmental conditions. In the "write" mode analog data are sampled and converted to digital bits of information. These individual bits are stored in a solid state storage medium by coded enabling and address information provided by a controller. The information is played back by reading out these digital bits, converting them to analog form, and then demultiplexing them to their original channels.