声卡数字频率计.该程序是标准的Windows界面，界面友好，以黑色背景红色大号字体显示频率值，具有醒目、程序简洁和测量精度高的特点-Sound Card digital frequency meter. The procedure is the standard Windows interface, the interface is friendly. red and black background tuba font frequency is smart, concise and proce