[电] group automatic gain regulation
dào qún zì dòng zēng yì tiáo zhěng ㄉㄠˋ ㄑㄩㄣˊ ㄗˋ ㄉㄨㄥˋ ㄗㄥ ㄧˋ ㄊㄧㄠˊ ㄓㄥˇ