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最近,资料介绍了用电话线路传送彩色图象的方法。虽然彩色图象的信息处理比较新颖,但用电话线路发射、接收及连续模拟信号的基本机理却极为平常。这种技术受到的限制越来越明显,因为要建立和维护所需要的优质声频电路(彩色发射装置频带为800赫～18千赫)相当昂贵。看来,电话公司目前提出的新的数字传输线路有可能解决一些问题,因为不需要特别校准就能适合最终带宽要求,能用本地区的一般电话分布网路开展临时性的数字传输业务,既迅速而成本又低。随着数字线路利用率的提高,采用图象信息数字编码是经济的。最近美国麻省理工学院受美联社委托,研制一种新的传真电报收发机和数字图象信息处理装置。研究成果包括激光扫描,干式
Recently, the document describes a method of transmitting color images over telephone lines. Although color image information processing is relatively new, the basic mechanism for transmitting, receiving and continuously simulating signals over telephone lines is quite common. The limitations of this technique are becoming more apparent as it is relatively expensive to build and maintain the high quality audio circuitry required (color transmitters with a frequency band of 800 Hz to 18 kHz). It appears that the new digital transmission lines currently proposed by telephone companies have the potential to solve some of the problems since the final bandwidth requirements can be accommodated without special calibration and the temporary digital transmission service can be carried out using the local telephone distribution network in the region, Fast and low cost. As the utilization of digital lines has increased, digital encoding using image information is economical. Massachusetts Institute of Technology recently commissioned by the Associated Press, the development of a new fax telephony transceiver and digital image information processing device. The research results include laser scanning, dry