Frequency band energy leakage and countermeasures in wavelet analysis
Jiajun Lin · Journal of Liaoning Technical University · 2005
In order to search the signal feature extraction optimization method and eliminate mistakes in diagnosis,the frequency characteristics of the daubechies wavelet series are analyzed.The problem of the frequency band energy leakage(FBEL) wavelet analysis is pointed out.The FBEL is not favourable to signal feature extraction and analysis.By the simulation research,the basic rules of the FBEL are gotten,and a frequency band energy increment comparison method is proposed.With this method,the frequency band of the signal feature frequency component is confirmed by the comparison among three adjacent frequency bands.The energy increment of the confirmed frequency band can act the feature of signal change.Experiments show that the signal feature extraction is optimized with the above method.