Solid-state digital flight data recorder
First Claim
Patent Images
1. A digital flight data recorder for recording units of signal information representing repetitively sampled aircraft operating parameters presented in series repeating data frames within a recording time period, comprising:
- minor memory means, having an input for receiving each series data frame and having an output, said minor memory circulating each received data frame therethrough, as received, in a preserved first-in first-out (FIFO) sequence to said output, whereby the current data frames circulating therethrough represent the information received in a most recent value real time interval less than the recording time period;
major memory means, having an input and an output, for circulating in FIFO sequence selected units of information presented to said input therethrough to said output; and
signal processing means, responsive to said minor memory means and said major memory means, for compressing said received series data frames appearing at said minor memory output so as to select therefrom successive ones of said received data frames as said selected units of information and to present said selected units of information to said major memory means, whereby said selected units of information in said major memory are represent the units of information received in the recording time period and said series data frames in said minor memory represent the units of information received within a most recent time interval of the recording period.
1 Assignment
0 Petitions
Accused Products
Abstract
A digital flight data recorder receives sensed parameter information in serial data format in successive data frames and first circulates the information in a first-in first-out (FIFO) sequence through a minor memory to preserve the data received over a most recent real time interval, after which the data is compressed to a smaller data base including periodic slow interval samples and intermediate exceedance parameter samples which are stored in a major memory for later retrieval.
-
Citations
17 Claims
-
1. A digital flight data recorder for recording units of signal information representing repetitively sampled aircraft operating parameters presented in series repeating data frames within a recording time period, comprising:
-
minor memory means, having an input for receiving each series data frame and having an output, said minor memory circulating each received data frame therethrough, as received, in a preserved first-in first-out (FIFO) sequence to said output, whereby the current data frames circulating therethrough represent the information received in a most recent value real time interval less than the recording time period; major memory means, having an input and an output, for circulating in FIFO sequence selected units of information presented to said input therethrough to said output; and signal processing means, responsive to said minor memory means and said major memory means, for compressing said received series data frames appearing at said minor memory output so as to select therefrom successive ones of said received data frames as said selected units of information and to present said selected units of information to said major memory means, whereby said selected units of information in said major memory are represent the units of information received in the recording time period and said series data frames in said minor memory represent the units of information received within a most recent time interval of the recording period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. In a method of recording units of signal information representing repetitively sampled aircraft operating parameters presented in series repeating data frames within a recording time period, the steps of:
-
receiving each serial data frame; circulating each of said received data frames in a preserved first-in first-out (FIFO) sequence through a first signal memory, such that the data frames circulating therethrough represent all of the information received in a most recent, selected value real time interval less than the recording time period; editing the preserved sequence of received data frames as they appear following said FIFO sequence through said first signal memory to designate therefrom successive ones of said received data frames as selected units of information; presenting said selected units of information to a second signal memory; and circulating said selected units of information in a second FIFO sequence through said second signal memory, whereby said selected units of information in said second signal memory represent the earlier units of information received in the recording time period and said preserved sequence of data frames in said first signal memory represent the latest units of information received within a most recent time interval of the recording period. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
Specification