This paper describes the principle, scheme and implementation of error control for Group 3 document facsimile apparatus, based on CCITT recommendation on the standard of error correction mode(ECM) for Group 3 apparatus.

• 本文根据CCITT关于G3文件传真差错纠正模式(ECM标准的建议；介绍了G3文件传真机的差错控制的原理、方案及其实现.