本文讨论了机器阅读特定印刷符号的三种不同的方法。第一种方法是采用一维扫描和波形相结合的方法,虽然这种方法已为人们所熟知,这里还是要叙述一下,因为它已经是很成功的读出方法,这种类型的机器投入运转的台数也确实此其他所有类型的总和还要多。第二种方法是利用频率-编码符号,虽 This article discusses three different ways a machine can read a particular printed symbol. The first method uses a combination of one-dimensional scanning and waveform. Although this method is well-known, here is a description of it because it is already a very successful method of reading and this type of machine is in operation The number of stations does indeed add up to the sum of all other types. The second way is to use frequency-coded symbols, though