论文部分内容阅读
目前国内磁记录行业测试最大输出电平(MOL)的方法十分繁琐。比如使用丹麦 B&K 公司的1027音频信号发生器,2010频率分析仪和1617带通滤波器组成的测试系统。测试磁带最大输出电平的步骤是;调整录音输入电平,使磁带重放信号的三次谐波失真达到3％,这时输出电平与参考电平(OdB=250nwb/m)之差即为 MOL。但在实际测试中,输入电平的变化会使基波输出电压和三次谐波输出电压相应改变,为了使基波输出电压为100％同时又使三
At present, the method of testing the maximum output level (MOL) of the magnetic recording industry in China is very tedious. For example, using Denmark’s B & K’s 1027 audio signal generator, 2010 frequency analyzer and 1617 bandpass filter test system. The step of testing the maximum output level of the tape is to adjust the recording input level so that the third harmonic distortion of the tape playback signal reaches 3%, then the difference between the output level and the reference level (OdB = 250nwb / m) is MOL. However, in the actual test, the input level changes will make the fundamental output voltage and the third harmonic output voltage change accordingly, in order to make the fundamental output voltage is 100%