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国营八二二厂于1982年10月试制成功的MHC型盒式磁带机是一种单速四通道模拟磁带记录器。该机采用二种记录制式:调频制式(FM制)和脉冲调宽制式(PDM制)。FM制符合IRIG标准,PDM制是一种新的记录体制,具有信/噪比高的特点,为国内首创。 MHC机主要用作各种低频随机信号的记录、存贮和再现。该机内部设有输入预放级,不必在外部进行预置放大,便可获得高信/噪比,还备有语言通道、自检电路、指示电路等,体积小、重量轻,操作维护十分方便。
State-run 82,2 plants in October 1982 successfully produced MHC cassette tape drive is a single-speed four-channel analog tape recorder. The machine uses two recording systems: FM (FM system) and pulse width modulation (PDM system). FM system in line with IRIG standards, PDM system is a new recording system, with a high signal / noise ratio for the domestic initiative. MHC machine is mainly used for a variety of low-frequency random signal recording, storage and reproduction. The machine has an input pre-release level inside, do not have to pre-amplify the external pre-access, you can get a high letter / noise ratio, but also with language channels, self-test circuit, indicating circuit, small size, light weight, Convenience.