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为了改善载波信道特性,使在话路频带内远距离传输4800bps较高速率数据信号,必须采用适当的、优良的均衡器。自适应均衡器是实现数据通信迅速和确保传输质量的关键设备之一。对4800比特/秒通用型调相制数传机要符合国际标准即CCITT V_(27bis)或V_(27ter)建议,那未自动均衡器是必不可少的。本文在简述了自动均衡技术发展情况后,介绍了8φ—DPSK4800bpsMODEM自适应均衡器的工作原理、方案选择等,然后介绍了设备的方框图和电路实现。最后谈谈试验结果。
In order to improve the carrier channel characteristics and to transmit 4800 bps higher data signals over the speech channel band, an appropriate and good equalizer must be used. Adaptive equalizer is one of the key devices to realize the rapid data communication and ensure the transmission quality. For a 4800 bit / sec universal phase modulation transmitter to comply with the international standard CCITT V_ (27bis) or V_ (27_), it is not necessary to have an automatic equalizer. After briefly introducing the development of automatic equalization technology, this paper introduces the working principle and scheme selection of 8φ-DPSK4800bps MODEM adaptive equalizer, and then introduces the block diagram and circuit implementation of the device. Finally talk about the test results.