{"title":"Data compression of voiceband modem signals","authors":"D. Lin, S. D. Kurtz, B. McCarthy","doi":"10.1109/VETEC.1990.110341","DOIUrl":null,"url":null,"abstract":"The development of an integrated data-compression system for speech and voiceband modem signals is described. The integrated source coder performs a quadrature decomposition of a bauded signal prior to quantization. A detection algorithm is used to determine the presence and the carrier frequency of the bauded signal. The coder is currently implemented with a TMS 32020 digital signal processor in a basic exchange radio system to provide wireless digital access for rural subscribers. Performance of the integrated source coder was evaluated in the lab and in a field trial. Using a radio link in the lab, the coder support the following data communication standards: 300 b/s Bell 103, CCITT V.21; 1200 b/s Bell 212A, CCITT V.22; 2400 b/s CCITT V.22 bis; and 2400 b/s CCITT V.24 ter. Tests were also conducted for the transmission of facsimiles between a dozen of the popular low-priced telecopiers. The reproduction quality of the system for various types of documents and drawings were near transparent.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"40th IEEE Conference on Vehicular Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/VETEC.1990.110341","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
The development of an integrated data-compression system for speech and voiceband modem signals is described. The integrated source coder performs a quadrature decomposition of a bauded signal prior to quantization. A detection algorithm is used to determine the presence and the carrier frequency of the bauded signal. The coder is currently implemented with a TMS 32020 digital signal processor in a basic exchange radio system to provide wireless digital access for rural subscribers. Performance of the integrated source coder was evaluated in the lab and in a field trial. Using a radio link in the lab, the coder support the following data communication standards: 300 b/s Bell 103, CCITT V.21; 1200 b/s Bell 212A, CCITT V.22; 2400 b/s CCITT V.22 bis; and 2400 b/s CCITT V.24 ter. Tests were also conducted for the transmission of facsimiles between a dozen of the popular low-priced telecopiers. The reproduction quality of the system for various types of documents and drawings were near transparent.<>
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