一、引言在768地震遥测系统中,从各台站传输到记录中心的地震信息,由768地震记录器进行可见记录。这种记录器具有自动换纸功能,换纸后,两侧时号笔及时绘出台号、年、月、日、时、分的串行调宽码记忆上纸时间。串行调宽时间码(简称串码)由768钟站提供,每分一帧,每帧声60个码元,每个码元一秒。记录短周期地震波时,记录器转速为2毫米/秒,一码元的走纸长度为2毫米,时号笔绘出的串码脉冲图疏密适当,清晰可 I. INTRODUCTION In the 768 telemetry system, the seismic information transmitted from stations to the recording center was recorded visually by a 768 seismograph. This recorder has a automatic paper exchange function, after changing paper, both sides of the time when the pen painted a table number, the year, month, day, hour, minutes, adjust the width of the memory code on the paper. Serial tone widening time code (referred to as string code) provided by the 768 clock station, each frame, each frame of 60 symbols, each symbol for one second. Record short-period seismic wave, the recorder speed of 2 mm / s, a symbol of the paper length of 2 mm, time stamp painted serial pulse code density appropriate and clear