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前言 迄今,地声观测记录系统基本上都是采用可见记录。虽模拟带记录和数字磁带记录仪的种类很多,但由于采用普通模拟磁带记录仪因速度快对观测人员来说工作量大,处理费时。若采用数字磁带记录仪,因对地声频段的信息采样要求更高,一盘磁带记录的时间就更短,因此不能进行磁带连续记录。为此我们试制出一种带有时间服务系统的四路慢速磁带记录仪,采用直接记录方式,记录速度为2.35毫米/秒,用快速回放,回放速度4.75厘米/秒,比记录速度提高二十倍。可以延长记录时间,节省磁带,便于连续记录、可减少处理资料的时间。同时也能
Foreword So far, acoustic recording systems are basically based on visible records. Although there are many types of analog tape recorder and digital tape recorder, it is time-consuming and labor-intensive for observers due to the speed of ordinary analog tape recorders. If a digital tape recorder is used, sampling of information on the ground acoustic band is more demanding and the time taken for recording on one tape is shorter, so continuous recording of the tape can not be performed. To this end, we have tried to produce a four-way slow tape recorder with a time service system that uses direct recording at a recording speed of 2.35 mm / sec with a fast playback speed of 4.75 cm / sec, faster than recording speed by two ten times. Can extend the recording time, save the tape for continuous recording, can reduce the time for processing information. At the same time also