Browse Prior Art Database

Graphic Subsystem Operating Like an X/Y Recorder

IP.com Disclosure Number: IPCOM000062475D
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Bapst, UH: AUTHOR [+2]

Abstract

This graphic subsystem is useful for displaying analog signals, from DC to about 1 kHz, in cartesian coordinate graphs on a screen. The subsystem comprises a symmetrical analog front end 1 (partially floating) for both variables and a common digital part 2. Each of the analog branches consists of an impedance converter 3, an attenuator/ amplifier 4, an insulating amplifier 5, and an analog filter 6. The branches are commonly connected at analog-to-digital (A/D) converters 7 to the digital part 2 which comprises a microprocessor 8, a graphics/video processor unit 9, a peripheral output unit 10, and an IEEE-488 controller 11. Beam on/beam off function, clear screen control, and hard-copy request can be controlled by external inputs.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 75% of the total text.

Page 1 of 2

Graphic Subsystem Operating Like an X/Y Recorder

This graphic subsystem is useful for displaying analog signals, from DC to about 1 kHz, in cartesian coordinate graphs on a screen. The subsystem comprises a symmetrical analog front end 1 (partially floating) for both variables and a common digital part 2. Each of the analog branches consists of an impedance converter 3, an attenuator/ amplifier 4, an insulating amplifier 5, and an analog filter 6. The branches are commonly connected at analog-to-digital (A/D) converters 7 to the digital part 2 which comprises a microprocessor 8, a graphics/video processor unit 9, a peripheral output unit 10, and an IEEE-488 controller 11. Beam on/beam off function, clear screen control, and hard-copy request can be controlled by external inputs. In the X/Y recorder mode of operation, the incoming analog signals are preprocessed to allow for compensation of offset (12), for scaling to given units (13), and for centering (14). The scaled signal is low-pass filtered (6) to suppress undesired high-frequency noise. After A/D conversion, the incoming values are passed through the microprocessors 8, 9 and transferred to the screen 15 at the highest possible rate. The video signal may also be sent to a hard-copy unit 16 for quick hard- copy output. In the digital plotter mode of operation, the analog front end 1 is disconnected and control is by standard HP-graphic language commands received via an IEEE-488 bus 17 and IEEE-488 controller...