一、前言 周期调制法是一种使用盒式音频录音机记录数据的新方法,与通常的频率调制法相比,传输速度提高了5—10倍,使普通音频录音机可以作为微型机的一种大容量、低价格的辅助外存贮设备。在目前软磁盘供应不足的情况下,盒式录音磁带不失为一种较为理想的记录程序与数据的存贮介质。 为了使用户能方便地执行与读、写磁带有 I. Introduction The periodic modulation method is a new method of recording data using a cassette audio recorder. Compared with the conventional frequency modulation method, the transmission speed is improved by 5-10 times, so that a conventional audio recorder can be used as a large capacity of a microcomputer , Low-cost auxiliary storage devices. In the current case of insufficient supply of floppy disks, cassette tape after all, is a more ideal recording program and data storage media. In order to allow users to easily carry out read and write tapes