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System for compressing aircraft flight data utilizing a multilevel time format

  • US 4,660,145 A
  • Filed: 02/03/1984
  • Issued: 04/21/1987
  • Est. Priority Date: 02/03/1984
  • Status: Expired due to Fees
First Claim
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1. In an aircraft flight data recorder system of the type wherein a plurality of input data signals that represent the status of corresponding aircraft parameters are periodically processed to provide a series of data frames with each data frame representing the status of selected ones of said aircraft parameters at particular points in time and with each data frame providing aircraft parameter status and associated time information that is stored in a memory device of the flight data recorder system for later retrieval therefrom, the improvement comprising:

  • (a) means for periodically producing within each data frame at least one reference time signal representative of elapsed time from a predetermined initial point in time;

    (b) means for sequentially determining, in accordance with a predetermined program, whether a signal representative of an input datum signal of said plurality of input data signals is to be included in a data frame, said means for sequentially determining including;

    (i) means for producing for each input datum signal to be represented in said data frames a label signal representative of the aircraft parameter corresponding to the input datum signal,(ii) means for producing for each said datum signal to be represented in said data frame, a time tag signal that is referenced to said reference time signal and is representative of a time interval within which the datum signal was produced, and(iii) means for producing for each said input datum signal to be represented in said data frame, a datum value signal representative of the input datum signal.

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