Signal recorder with status recognizing function

• US 20040193387A1
• Filed: 12/12/2003
• Published: 09/30/2004
• Est. Priority Date: 06/14/2001
• Status: Abandoned Application

• Current Assignee: MIE TLO Company Limited, MIE University
• Original Assignee: MIE TLO Company Limited, MIE University
• Inventors: Jinyama, Ho
• Application Number:
  US10/480,454
• Publication Number:
  US 20040193387A1
• Time in Patent Office: Days
• US Class Current: 702/181
• CPC Class Codes: G01D 1/18 with arrangements for signalling that a predetermined value of an unspecified parameter has been exceeded G01D1/14 takes precedence
• CPC Class Codes: G01D 9/005 Solid-state data loggers
• CPC Class Codes: G05B 23/0281 Quantitative, e.g. mathematical distance; Clustering; Neural networks; Statistical analysis

Abstract

A signal recording system and signal recording device including a status recognizing method and a status recognizing function of recording feature parameters reflecting the status change and a raw signal for status change and a raw signal for status monitoring with no wasteful recording medium. Feature parameters in the high, medium and low frequency ranges of a signal generated from a sensor are determined by calculation and whether either only the feature parameter or both the feature parameters and a raw signal of a necessary time length are recorded is decided depending on the degree of a status change. In judging the status, the recorded feature parameters are converted into normalized feature parameters conforming to a normal probability density distribution, the status judgment criterion of dimensional and dimensionless feature parameters and normalized feature parameters are determined according to probability examination, confidence interval and possibility theory and the results of judgment of the dimensional and dimensionless feature parameters are integrated, thereby making status judgment. As required, the tendency of status change is managed, the status is predicted and the cause of a status change is analyzed. The status at the measurement is displayed and a warning is given if the status is dangerous.

Claims

1. A signal recording system and a signal recording device comprising:

means for calculating a feature parameter in each of frequency bands by using a signal of an object measured by a sensor;

means for performing conversion of the calculated feature parameter into a normal feature parameter conforming to normal probability density distribution;

means for performing state judgment, trend control of state change, and state prediction by using the normal feature parameter obtained through said conversion;

means for laying down a criterion of the state judgment of a dimensional feature parameter and a non-dimensional feature parameter based on a statistical test, a confidence interval, and a possibility theory for judging a degree of the state change;

means for laying down a criterion of the state judgment of the normal feature parameter based on the statistical test, the confidence interval, and the possibility theory;

means for judging the degree of the state change by integrating a result of the state judgment of the dimensional feature parameter and the non-dimensional feature parameter;

means for determining whether only the feature parameter in each of the frequency bands is recorded or the feature parameter in each of the frequency bands and a raw signal in time sequence are concurrently recorded, based on the result of the state judgment; and

means for displaying the degree of the state change by means of probability and an order of possibility, the display means being a state lamp.