{"title":"一个简单的方案增强重分配的SPWV表示的噪声信号","authors":"A. Loza, N. Canagarajah, Dave Bull","doi":"10.1109/ISPA.2003.1296353","DOIUrl":null,"url":null,"abstract":"The reassignment procedure has often been employed to improve readability of some time-frequency representations (TFRs). When processing noisy signals, the problem of sensitivity of the technique to noise is encountered. In this paper, a simple modification of reassignment method is proposed, based on thresholding operation. Specifically, by preventing the reassignment of the distribution coefficients below the noise dependent threshold and replacing them with zeros, the enhanced signatures on the time-frequency plane are obtained. This method is compared with other techniques, such as the reassigned spectrogram (RSP) and the supervised reassigned spectrogram (SRSP). An experimental test of these algorithms as the instantaneous frequency (IF) estimators for a chirp signal have shown that our method improves the accuracy of the estimation for heavy noise.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"2 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A simple scheme for enhanced reassignment of the SPWV representation of noisy signals\",\"authors\":\"A. Loza, N. Canagarajah, Dave Bull\",\"doi\":\"10.1109/ISPA.2003.1296353\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The reassignment procedure has often been employed to improve readability of some time-frequency representations (TFRs). When processing noisy signals, the problem of sensitivity of the technique to noise is encountered. In this paper, a simple modification of reassignment method is proposed, based on thresholding operation. Specifically, by preventing the reassignment of the distribution coefficients below the noise dependent threshold and replacing them with zeros, the enhanced signatures on the time-frequency plane are obtained. This method is compared with other techniques, such as the reassigned spectrogram (RSP) and the supervised reassigned spectrogram (SRSP). An experimental test of these algorithms as the instantaneous frequency (IF) estimators for a chirp signal have shown that our method improves the accuracy of the estimation for heavy noise.\",\"PeriodicalId\":218932,\"journal\":{\"name\":\"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the\",\"volume\":\"2 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2003-09-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/ISPA.2003.1296353\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ISPA.2003.1296353","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A simple scheme for enhanced reassignment of the SPWV representation of noisy signals
The reassignment procedure has often been employed to improve readability of some time-frequency representations (TFRs). When processing noisy signals, the problem of sensitivity of the technique to noise is encountered. In this paper, a simple modification of reassignment method is proposed, based on thresholding operation. Specifically, by preventing the reassignment of the distribution coefficients below the noise dependent threshold and replacing them with zeros, the enhanced signatures on the time-frequency plane are obtained. This method is compared with other techniques, such as the reassigned spectrogram (RSP) and the supervised reassigned spectrogram (SRSP). An experimental test of these algorithms as the instantaneous frequency (IF) estimators for a chirp signal have shown that our method improves the accuracy of the estimation for heavy noise.