On the speed-up of data handling in the geophysical prospecting

摘要

The way of data handling in personal computer has been treated. BASIC language is suitable for using in the field, because it is easy to use and modify its contents. However the time of executing some jobs in BASIC is longer than that of the compiler language, for example FORTRAN or C. In this study several examples are shown in order to reduce the time of data handling.It takes two minutes in BASIC to transfer 204S data from AID converter (DM-7100) to personal computer (PS-SO). The time can be reduced to three seconds if the part of data transfer routine is replaced to machine language routine. The BASIC commands, BSAVE and BLOAD, are convenient for treating array data, and need only few seconds to save or load 64K byte data.The size of two dimensional integer array (ISO x ISO) in the floppy disk which BSAVE stores is 64S01 bytes. This size is one byte greater than that which is stored as random data file for the same array. The sequential data file is about three times greater in size than the random file and BSAVE file. Co-processor (SOS7 or S02S7) can improve efficiency in frequency analysis (FFT andInverse FFT) and terrain correction calculation. Machine language routines are examined in detail as to how replacing BASIC routine.