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一、前言增量调制是在脉码调制(PCM)技术之后作为模拟信号数字化的另一种调制方式而提出来的。它为模拟信号变为二进制数码提供了一种简单的编译码技术。六十年代中期以来,发展颇为迅速。由于它的优点较多,应用日益广泛。但是,把增量调制技术用于图象信息编码传输,在国内尚不多见。为了成完风云型气象卫星资料的传输任务,中央气象局决定从卫星地面站到资料处理中心架设一条二次群数字微波中继线路。据系统工程的要求,采用高速增量调制技术来传输四
I. INTRODUCTION Incremental modulation is proposed as another modulation method for digitizing an analog signal after pulse code modulation (PCM) technology. It provides a simple coding technique for converting analog signals into binary numbers. Since the mid-1960s, the development has been quite rapid. Due to its advantages, more and more widely used. However, the incremental modulation technology for image information encoding and transmission, is still rare in China. In order to complete the task of transmitting the meteorological satellite data, the Central Weather Bureau decided to set up a second-group digital microwave relay line from the satellite ground station to the data processing center. According to the requirements of system engineering, the use of high-speed incremental modulation technology to transmit four