Aircraft flight data recorder data acquisition system
US4656585A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1984 |
| Grant date | Apr 7, 1987 |
| Priority date | — |
| Expiry date | Feb 3, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C5/085
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A data acquisition system for use in an aircraft flight data recorder receives multiple analog and discrete signals representative of various aircraft parameters. A single address command from the flight data recorder central processing unit (CPU) causes a first multiplexer to select a set of analog signals. Each selected analog signal is amplified by a gain factor under CPU control and passed to track-and-hold circuitry which holds a level of the amplified analog signal upon receipt of a suitable command. The held analog signal levels are passed to a second multiplexer which also receives a set of discrete signals selected by a third multiplexer in response to a CPU address command. A control sequencer sequentially passes each signal at the input of the second multiplexer through an analog-to-digital converter, with the resultant digital signal being loaded into memory. After either all the selected and processed analog signals or the selected discrete signals have been analog-to-digital converted and stored in memory, the control sequencer issues an interrupt signal to the CPU.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.