转换子程序 meaning in English

conversion routine

Software design firstly introduces sof tware development environment and the task of software design for dsp based hydraulicturbine speed governor . then it gives several key subprogram , including frequency measuring , a / d convert , pwm output with a dead band , lcd display
软件部分首先介绍了软件开发的环境及要完成的任务，给出了测频子程序、 a d转换子程序、带死区pwm输出子程序、液晶显示子程序的设计及部分程序代码。