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最近,我们研制了一种高密度记录磁带机、使用国产磁头和磁带,记录密度达210~(bif)/mm。可在多种带速下重发,误码率达1×10~(-5),如果磁头,磁带采取某些措施,误码率可达1×10~(-6)。分析磁通变换传递信息的能力可知,NRZ—Ⅰ编码具有最高的编码效率,因而适用于实现高密度数字记录。其缺点是:NRZI 码不能自带钟信号,而要求在相邻磁道记录时钟,这样,由于运带部分头带接触和电子线路的缺陷引起的时间位移误差,将成为限制记录密度提高的主要
Recently, we developed a high-density recording tape drive, using domestic magnetic head and tape, the recording density of 210 ~ (bif) / mm. It can be retransmitted at a variety of tape speeds with bit error rate of 1 × 10 ~ (-5). If head and tape adopt some measures, the bit error rate can reach 1 × 10 -6. Analyzing the ability of flux transfer to convey information shows that NRZ-I encoding has the highest encoding efficiency and is therefore suitable for high-density digital recording. The disadvantage is that the NRZI code can not clock itself and requires the clock to be recorded on adjacent tracks so that the time shift error due to the headband contact of the transport belt and the defect of the electronic line will become the main limit to the improvement of the recording density