EP 1955030 A2 20080813 - METHOD FOR ANALYZING THE NOISE OF AN INTERNAL COMBUSTION ENGINE
Title (en)
METHOD FOR ANALYZING THE NOISE OF AN INTERNAL COMBUSTION ENGINE
Title (de)
VERFAHREN ZUR ANALYSE EINES GERÄUSCHES EINER BRENNKRAFTMASCHINE
Title (fr)
PROCEDE D'ANALYSE D'UN BRUIT D'UN MOTEUR A COMBUSTION INTERNE
Publication
Application
Priority
- AT 2006000496 W 20061130
- AT 19432005 A 20051201
- AT 9172006 A 20060526
Abstract (en)
[origin: WO2007062447A2] The invention relates to a method for quantitatively analyzing a noise of an internal combustion engine, especially a diesel engine. According to said method, a signal progression is determined over a predefined recording period, the determined signal is subjected to bandpass filtering in the time domain, and an envelope curve for the bandpass-filtered signal is formed for at least one frequency band. The subjectively perceived nuisance of noise containing impulses is measured objectively by carrying out the following steps: temporal masking according to human auditory perception is taken into account in the envelope curve; the remaining degree of modulation in each frequency band is calculated after taking into account temporal masking; level-dependent masking is calculated for each of all other frequency bands; the remaining audible degrees of modulation are calculated for all frequency bands; the audible degrees of modulation are weighted with a frequency-dependent weighting function; and a noise index is created based on the weighted modulation frequency spectrum.
IPC 8 full level
G01H 3/08 (2006.01); G01L 23/22 (2006.01); G01M 15/12 (2006.01)
CPC (source: EP)
G01H 3/08 (2013.01); G01M 15/12 (2013.01)
Citation (search report)
See references of WO 2007062447A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
WO 2007062447 A2 20070607; WO 2007062447 A3 20080313; EP 1955030 A2 20080813
DOCDB simple family (application)
AT 2006000496 W 20061130; EP 06817472 A 20061130