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引用次数: 4
摘要
介绍了一种用于语音和语音波段调制解调器信号的集成数据压缩系统的开发。集成的源编码器在量化之前对波特信号进行正交分解。一种检测算法被用来确定波特信号的存在和载波频率。编码器目前在基本交换无线电系统中使用TMS 32020数字信号处理器实现，为农村用户提供无线数字接入。在实验室和现场试验中对集成源代码编码器的性能进行了评估。采用实验室无线链路，编码器支持以下数据通信标准:300b /s Bell 103, CCITT V.21;1200 b/s Bell 212A, CCITT V.22;2400 b/s CCITT V.22 bis;和2400 b/s CCITT V.24 ter。还对十几种流行的低价复印机之间的传真传输进行了测试。该系统对各种类型的文件和图纸的复制质量接近透明。
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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