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ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)最新文献

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Text-to-speech conversion system for Brazilian Portuguese using a formant-based synthesis technique 使用基于共振峰的合成技术的巴西葡萄牙语文本到语音转换系统
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713120
L. De C.T. Gomes, E. J. Nagle, J.G. Chiquito
{"title":"Text-to-speech conversion system for Brazilian Portuguese using a formant-based synthesis technique","authors":"L. De C.T. Gomes, E. J. Nagle, J.G. Chiquito","doi":"10.1109/ITS.1998.713120","DOIUrl":"https://doi.org/10.1109/ITS.1998.713120","url":null,"abstract":"This paper contains a general description of the text-to-speech conversion system for Brazilian Portuguese developed at the Signal Processing Laboratory of FEEC-Unicamp. The system is fully operational and performs the whole process of text-to-speech conversion, including components for text processing (preprocessing, grammatical classification and phonetic transcription), prosodic processing (generation of intonation patterns and segmental durations) and signal processing (using the Klatt formant synthesizer, with a synthesis-by-rule technique for generating synthesizer control parameters).","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125148305","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}
引用次数: 7
From GSM toward UMTS: a radio interface for multimedia services transmission 从GSM到UMTS:多媒体业务传输的无线电接口
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718423
R.T. Fernandez, J.E. Preciado Velasco
{"title":"From GSM toward UMTS: a radio interface for multimedia services transmission","authors":"R.T. Fernandez, J.E. Preciado Velasco","doi":"10.1109/ITS.1998.718423","DOIUrl":"https://doi.org/10.1109/ITS.1998.718423","url":null,"abstract":"This paper analyzes the feasibility of multimedia service transmission in wireless communications networks. There is a special interest that these services can be introduced into the second-generation mobile communications systems, so a smooth evolution toward the third-generation can be achieved. The principal challenges are concerned with the radio interface, where the packet reservation multiple access (PRMA) scheme operating under different digital modulation techniques is introduced. The feasibility analysis is realized through simulation. A comparison with the GSM system (a second-generation system) in terms of user capacity, bit error rate and channel access delay is accomplished. The same traffic load was used for all the systems, so a direct comparison can be done.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126280453","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}
引用次数: 2
Realistic discrete channel models for error control strategies evaluation 误差控制策略评估的现实离散信道模型
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713088
N. Nefedov
{"title":"Realistic discrete channel models for error control strategies evaluation","authors":"N. Nefedov","doi":"10.1109/ITS.1998.713088","DOIUrl":"https://doi.org/10.1109/ITS.1998.713088","url":null,"abstract":"The evaluation of error control strategies for different wireless services implies the existence of models which can describe physical and data-link layers as a whole. We present discrete channel (DC) models for wireless services, which are based upon nested hidden Markov models (HMM) and take into account soft decision outputs. It is shown that realistic DC models based upon GSM and CDMA radio channels without FEC may have a relatively large number of channel states. The sequence of erroneous frames after decoding in most practical cases may be accurately represented by one-error-state Fritchman models. DC model parameters for ARQ and hybrid FEC-ARQ schemes are presented.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126294649","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}
引用次数: 2
A fast thinning algorithm 一种快速细化算法
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718462
E. L. Flôres
{"title":"A fast thinning algorithm","authors":"E. L. Flôres","doi":"10.1109/ITS.1998.718462","DOIUrl":"https://doi.org/10.1109/ITS.1998.718462","url":null,"abstract":"This paper describes a fast thinning algorithm (FTA). This algorithm possesses two main steps, that are repeated until the obtained image approaches the medium axis of the original image. In the first step the contour of the image is marked and in the second step the contour marked is analysed to verify which pixels-on belonging to this contour should be deleted. The FTA algorithm maintains the connectivity and preserves the end points of the final image of the skeleton. It is practically immune to noise and, of extreme importance, has a shorter execution time. Several tests are carried out and the results obtained are very satisfactory.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126354114","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}
引用次数: 5
Two-scale transmission of DCT-coded video over lossy packet networks dct编码视频在有损分组网络上的双尺度传输
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718446
L. Mendes, R. Togni del Pietro, M.H.M. Costa
{"title":"Two-scale transmission of DCT-coded video over lossy packet networks","authors":"L. Mendes, R. Togni del Pietro, M.H.M. Costa","doi":"10.1109/ITS.1998.718446","DOIUrl":"https://doi.org/10.1109/ITS.1998.718446","url":null,"abstract":"This paper discusses the development and results of a simulation package for two-scale transmission of discrete cosine transform (DCT)-coded video over lossy packet networks. The considered scalability of coded video sequences is based on variations of data partitioning and requantization techniques. These variations contemplate situations in which the reference signal used in predicted (P-type) or interpolated (B-type) frames is based on the full coded signal, or alternatively, based only on the high-priority signal. Also considered are variations of data partitioning with a fixed number of spectral coefficients. The signals relating to the two scales are to be transmitted over a channel formed by a high-priority link, with no loss of cells, and a low-priority, lossy link. The results of transmission over packet networks with various levels of cell loss rate are presented and a few conclusions are drawn.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123902914","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}
引用次数: 1
Formant frequency estimation using a Mel-scale LPC algorithm 基于mel尺度LPC算法的形成峰频率估计
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713118
Antonio Marcos de Lima Araujo, Fiibio Violaro
{"title":"Formant frequency estimation using a Mel-scale LPC algorithm","authors":"Antonio Marcos de Lima Araujo, Fiibio Violaro","doi":"10.1109/ITS.1998.713118","DOIUrl":"https://doi.org/10.1109/ITS.1998.713118","url":null,"abstract":"This paper presents an algorithm for F1 and F2 formant estimation. The proposed algorithm combines a linear predictive analysis together with the Mel psychoacoustical perceptual scale. The algorithm was tested for the first 2 formants and produced good performance for male and female speakers, adults and children. In contrast to the classical LPC algorithm which requires variable-order prediction filters to take into account different formant patterns, the proposed algorithm is capable of extracting these formants with a fixed-order prediction filter.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"241 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115504883","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}
引用次数: 24
Nonlinear switching recovery in planar directional coupler with loss 带损耗平面定向耦合器的非线性开关恢复
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718426
A. Sombra, K. Nobrega
{"title":"Nonlinear switching recovery in planar directional coupler with loss","authors":"A. Sombra, K. Nobrega","doi":"10.1109/ITS.1998.718426","DOIUrl":"https://doi.org/10.1109/ITS.1998.718426","url":null,"abstract":"Twin-core nonlinear directional couplers that include loss and nonlinear refractive index are examined. The inclusion of loss results in the increase of the critical power of the coupler while the switching characteristics deteriorate. To compensate for this behavior associated with the loss, we investigate the effect of the nonlinearity profile on the performance of an increasing nonlinearity coupler. We have shown that appropriate shaping of the nonlinear self-phase modulation profile is quite effective in recovering, almost completely, the original switching behavior associated with the lossless situation. It is concluded that the exponential nonlinearity profile is nearly optimum for the recovery of the lossless switching behavior.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132468242","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}
引用次数: 0
Multiple class selective discard under a long-range-dependent process 长程依赖过程下的多类选择性丢弃
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713098
N. Fonseca, M.J. Ferreira
{"title":"Multiple class selective discard under a long-range-dependent process","authors":"N. Fonseca, M.J. Ferreira","doi":"10.1109/ITS.1998.713098","DOIUrl":"https://doi.org/10.1109/ITS.1998.713098","url":null,"abstract":"Providing diverse QoS requirements in multimedia networks is a challenging task. Under a long-range-dependent process, the loss rate does not decrease considerably as we increase the buffer size. We investigate the advantages of adopting a multi-priority selective discard mechanism over traditional two-priority mechanisms under a long-range-dependent process.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131614543","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}
引用次数: 3
Complete analysis of the complex and arbitrary bilateral finlines 复杂和任意的双边鳍线的完整分析
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718428
Humberto Fernandes, J. De Albuquerque Sales Neto
{"title":"Complete analysis of the complex and arbitrary bilateral finlines","authors":"Humberto Fernandes, J. De Albuquerque Sales Neto","doi":"10.1109/ITS.1998.718428","DOIUrl":"https://doi.org/10.1109/ITS.1998.718428","url":null,"abstract":"An electromagnetic application is developed to obtain the effective dielectric constant, the attenuation constant and the characteristic impedance of the arbitrary bilateral fin lines with semiconductor substrate and conductor thickness simultaneity for the first time. Also the concise transverse transmission line (TTL) full wave method is used in the analysis. New results of the complex propagation and of the characteristic impedance as functions of the frequency and different dimensions and conductivity of the substrate, are obtained in 3D.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126668952","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}
引用次数: 0
Runlength-limited error control codes from binary expansions of Reed-Solomon codes 从里德-所罗门码的二进制展开的运行长度有限的错误控制码
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718452
E.M.G. Fernandez, R. B. Filho
{"title":"Runlength-limited error control codes from binary expansions of Reed-Solomon codes","authors":"E.M.G. Fernandez, R. B. Filho","doi":"10.1109/ITS.1998.718452","DOIUrl":"https://doi.org/10.1109/ITS.1998.718452","url":null,"abstract":"Two examples are presented to find runlength-limited error control codes from linear transparent binary expansions of Reed-Solomon codes. The codes obtained can correct burst and random errors and are suitable for digital transmission and recording systems.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128132409","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}
引用次数: 0
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