Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770257
N. Kudoh, Y. Tadokoro
This paper presents a method to compute Fourier coefficients at arbitrary frequencies. The method is developed for the case that prior knowledge of signal frequencies is not accurate or the frequencies are time varying and additive white noise exists. A less computationally complex algorithm of adaptive constrained IIR notch filters connected in cascade is proposed. The main advantages are as follows: (1) perpetrations of adaptive parameters is reduced, because of estimating notch frequencies by using a recursive LMS algorithm not intermediately from filter coefficients but directly from signal samples; (2) by the feedback of notch frequencies estimated by a less-biased overdetermined frequency estimation method to adaptive parameters, the convergence speed and the perturbation after convergence are improved.
{"title":"Adaptive IIR notch filter by frequency estimation for notch Fourier transform","authors":"N. Kudoh, Y. Tadokoro","doi":"10.1109/ICOSP.1998.770257","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770257","url":null,"abstract":"This paper presents a method to compute Fourier coefficients at arbitrary frequencies. The method is developed for the case that prior knowledge of signal frequencies is not accurate or the frequencies are time varying and additive white noise exists. A less computationally complex algorithm of adaptive constrained IIR notch filters connected in cascade is proposed. The main advantages are as follows: (1) perpetrations of adaptive parameters is reduced, because of estimating notch frequencies by using a recursive LMS algorithm not intermediately from filter coefficients but directly from signal samples; (2) by the feedback of notch frequencies estimated by a less-biased overdetermined frequency estimation method to adaptive parameters, the convergence speed and the perturbation after convergence are improved.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130843637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770874
Wu Ming, Liu Fang, Jiao Licheng
A method for radar target identification by range profile is proposed in this paper based on the combination of wavelet and evolutionary networks. The wavelet transform is used to pre-process the range profiles. A classifier based on evolutionary networks which is the integration of neural networks and a modified genetic algorithm is proposed.
{"title":"Radar target recognition based on wavelet and evolutionary networks","authors":"Wu Ming, Liu Fang, Jiao Licheng","doi":"10.1109/ICOSP.1998.770874","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770874","url":null,"abstract":"A method for radar target identification by range profile is proposed in this paper based on the combination of wavelet and evolutionary networks. The wavelet transform is used to pre-process the range profiles. A classifier based on evolutionary networks which is the integration of neural networks and a modified genetic algorithm is proposed.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132862724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770311
H. Fujisaki, S. Ohno
This paper describes the command-response model for F/sub O/ contour generation originally developed for common Japanese, and demonstrates its capability of generating F/sub O/ contours of various other languages with minor language-specific modifications. The model is especially useful in multilingual speech synthesis, since the same mechanism can be driven by language-specific patterns of input commands to produce F/sub O/ contours of utterances of the respective languages.
{"title":"The use of a generative model of F/sub 0/ contours for multilingual speech synthesis","authors":"H. Fujisaki, S. Ohno","doi":"10.1109/ICOSP.1998.770311","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770311","url":null,"abstract":"This paper describes the command-response model for F/sub O/ contour generation originally developed for common Japanese, and demonstrates its capability of generating F/sub O/ contours of various other languages with minor language-specific modifications. The model is especially useful in multilingual speech synthesis, since the same mechanism can be driven by language-specific patterns of input commands to produce F/sub O/ contours of utterances of the respective languages.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133206658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770772
Shan-Shan Zhang, H. Hamabe, J. Maeda
A hybrid approach is presented in this paper to segmenting the brain matter, as assessed by magnetic resonance (MR) imaging, into three major tissue classes of gray matter (GM), white matter (WM), and cerebrospinal fluid (CSF). First, a fuzzy clustering algorithm is used to divide the original T1 and T2 weighted MR images into groups with similar intensity distributions. Then a multiple level reasoning method is adopted to label the pixels of the cerebral MR image into one of the three of the tissue classes. Finally, the symmetric index is calculated for these tissue classes to show the possible abnormalities in the brain tissues.
{"title":"A hybrid approach to segmentation of two channels cerebral MR images","authors":"Shan-Shan Zhang, H. Hamabe, J. Maeda","doi":"10.1109/ICOSP.1998.770772","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770772","url":null,"abstract":"A hybrid approach is presented in this paper to segmenting the brain matter, as assessed by magnetic resonance (MR) imaging, into three major tissue classes of gray matter (GM), white matter (WM), and cerebrospinal fluid (CSF). First, a fuzzy clustering algorithm is used to divide the original T1 and T2 weighted MR images into groups with similar intensity distributions. Then a multiple level reasoning method is adopted to label the pixels of the cerebral MR image into one of the three of the tissue classes. Finally, the symmetric index is calculated for these tissue classes to show the possible abnormalities in the brain tissues.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127811721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770149
Wu Limin, Ye Zhenhua, Zhou Min, Zhang Jie, Zhen Linhua
With the development of modern communication technologies, the requirements for data processing and transmission in a high-speed and high-capacity system are becoming greater. High-speed digital signal processor TMS320C50 can meet the demand of high-speed and high-capacity systems with its powerful processing functions and reliable performance. Taking an example of a high-speed data processing and transmission system, this paper deals mainly with the characteristics of the high-speed digital signal processing chip TMS320C50, and its application in a high-speed data processing and transmission system.
{"title":"An approach to TMS320C50 high-speed data processing and transmission system","authors":"Wu Limin, Ye Zhenhua, Zhou Min, Zhang Jie, Zhen Linhua","doi":"10.1109/ICOSP.1998.770149","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770149","url":null,"abstract":"With the development of modern communication technologies, the requirements for data processing and transmission in a high-speed and high-capacity system are becoming greater. High-speed digital signal processor TMS320C50 can meet the demand of high-speed and high-capacity systems with its powerful processing functions and reliable performance. Taking an example of a high-speed data processing and transmission system, this paper deals mainly with the characteristics of the high-speed digital signal processing chip TMS320C50, and its application in a high-speed data processing and transmission system.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127818469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770328
Chen Chunling, Wang Shaodi, Shan bingzhe
A fractal image coding based on the quadtree (FICBQ) is presented in this paper. Compared with the basic automatic fractal image coding (BAFIC), it overcomes the BAFIC shortcomings: an image has to be divided into square ranges of a fixed size, etc. The FICBQ is simple in the image division and can obtain higher compression ratios and needs less computation time while coding. Experimental results show that when the FICBQ obtains a PSNR of 29.37 dB and compression ratio of 11.09, the coding time is about 1/22 of BAFIC's.
{"title":"A fractal image coding based on the quadtree","authors":"Chen Chunling, Wang Shaodi, Shan bingzhe","doi":"10.1109/ICOSP.1998.770328","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770328","url":null,"abstract":"A fractal image coding based on the quadtree (FICBQ) is presented in this paper. Compared with the basic automatic fractal image coding (BAFIC), it overcomes the BAFIC shortcomings: an image has to be divided into square ranges of a fixed size, etc. The FICBQ is simple in the image division and can obtain higher compression ratios and needs less computation time while coding. Experimental results show that when the FICBQ obtains a PSNR of 29.37 dB and compression ratio of 11.09, the coding time is about 1/22 of BAFIC's.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131280670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770927
Shen Ying, Shang Weihua, Liu Guo-sui
This paper analyzes a kind of chaotic modulated signal, these phase modulated radar signals are generated by chaotic signals. The ambiguity function of the coded signals is also given. Theory and simulation results show that the ambiguity function of the chaotic modulated signals is approximately "thumbtack-shaped" for the ideal result. Thus the signal has high resolution both in the time-delay domain and the Doppler frequency domain. It implies the possibility and advantages for chaos to be used in radar signal processing.
{"title":"Ambiguity function of chaotic phase modulated radar signals","authors":"Shen Ying, Shang Weihua, Liu Guo-sui","doi":"10.1109/ICOSP.1998.770927","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770927","url":null,"abstract":"This paper analyzes a kind of chaotic modulated signal, these phase modulated radar signals are generated by chaotic signals. The ambiguity function of the coded signals is also given. Theory and simulation results show that the ambiguity function of the chaotic modulated signals is approximately \"thumbtack-shaped\" for the ideal result. Thus the signal has high resolution both in the time-delay domain and the Doppler frequency domain. It implies the possibility and advantages for chaos to be used in radar signal processing.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133794274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770141
Zhang Qunying, Yang Xuexian, Han Yueqiu
Digital pulse compression, which has high stability, precision and flexibility, is widely used in current pulse compression radar. However, there still exist many problems in practice. Two important problems of matched filter realization are analyzed. The relationship between sampling rate and system output signal to noise ratio is analyzed in this paper. Finally, beneficial conclusions are obtained and the conclusions are confirmed by computer simulation.
{"title":"Effect of sampling rate on SNR in digital pulse compression system","authors":"Zhang Qunying, Yang Xuexian, Han Yueqiu","doi":"10.1109/ICOSP.1998.770141","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770141","url":null,"abstract":"Digital pulse compression, which has high stability, precision and flexibility, is widely used in current pulse compression radar. However, there still exist many problems in practice. Two important problems of matched filter realization are analyzed. The relationship between sampling rate and system output signal to noise ratio is analyzed in this paper. Finally, beneficial conclusions are obtained and the conclusions are confirmed by computer simulation.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115233931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770942
Feng Rice, B. Cowley, M. Rice, B. Moran
Carrier frequency offset is a significant problem in achieving signal acquisition in communications equipment. In a receiver the frequency offset must be corrected before symbol timing and phase recovery operations can be completed. Several methods have been applied to frequency estimation, for example, the fast Fourier transform (FFT) method and the differential phase method. However, the FFT method suffers from threshold effects and the differential phase method, although simple, suffers an SNR penalty though its differential detection and is sensitive to large frequency offsets. This paper describes a trellis based scheme for frequency and phase estimation. A recently reported technique, per-survivor processing (Raheli, 1995) has been adapted to make use of the trellis structure and is described. The technique, referred to herein as frequency estimation by PSP (FEPSP), gives near optimum performance under certain conditions. Firstly Cramer-Rao lower bounds (CRLB) are derived for the frequency estimator and the phase estimator. The PSP estimation algorithm is then described. Lastly, the performance of the FEPSP is discussed and compared with that of the CRLB and FFT methods.
{"title":"Spectrum analysis using a trellis algorithm","authors":"Feng Rice, B. Cowley, M. Rice, B. Moran","doi":"10.1109/ICOSP.1998.770942","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770942","url":null,"abstract":"Carrier frequency offset is a significant problem in achieving signal acquisition in communications equipment. In a receiver the frequency offset must be corrected before symbol timing and phase recovery operations can be completed. Several methods have been applied to frequency estimation, for example, the fast Fourier transform (FFT) method and the differential phase method. However, the FFT method suffers from threshold effects and the differential phase method, although simple, suffers an SNR penalty though its differential detection and is sensitive to large frequency offsets. This paper describes a trellis based scheme for frequency and phase estimation. A recently reported technique, per-survivor processing (Raheli, 1995) has been adapted to make use of the trellis structure and is described. The technique, referred to herein as frequency estimation by PSP (FEPSP), gives near optimum performance under certain conditions. Firstly Cramer-Rao lower bounds (CRLB) are derived for the frequency estimator and the phase estimator. The PSP estimation algorithm is then described. Lastly, the performance of the FEPSP is discussed and compared with that of the CRLB and FFT methods.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115436865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-10-12DOI: 10.1109/ICOSP.1998.770289
Fu Qiuliang, Chen Fang, Lin Biqin, Y. Baozong
Speech recognition understanding is an active research subject. Currently, continuous speech recognition is being studied by many scientists, and some machines which have good performance have been delivered recently. A new approach for Chinese speech recognition and understanding is proposed, which is called a close ring structure with information feedback for speech recognition and understanding, and a system of Chinese sentence understanding based on the new approach is realized. Finally, we give the result of the Chinese sentence understanding system, and analyze this result in detail.
{"title":"Chinese sentence understanding with information feedback","authors":"Fu Qiuliang, Chen Fang, Lin Biqin, Y. Baozong","doi":"10.1109/ICOSP.1998.770289","DOIUrl":"https://doi.org/10.1109/ICOSP.1998.770289","url":null,"abstract":"Speech recognition understanding is an active research subject. Currently, continuous speech recognition is being studied by many scientists, and some machines which have good performance have been delivered recently. A new approach for Chinese speech recognition and understanding is proposed, which is called a close ring structure with information feedback for speech recognition and understanding, and a system of Chinese sentence understanding based on the new approach is realized. Finally, we give the result of the Chinese sentence understanding system, and analyze this result in detail.","PeriodicalId":145700,"journal":{"name":"ICSP '98. 1998 Fourth International Conference on Signal Processing (Cat. No.98TH8344)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115453280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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