Materiały konferencyjne SEP 1992

F i g . 12 S«i«mogramfl of an •Y^nt in th« coal a•am, plot t^d acoordlng to gaophona •s/mnt d101anc•. VERTICAL 500 1000 FREOUENCY (Hz) P i f f . 13 ^^ical salnoacouatic aignal with fraqu«ncy analysas. Tha thraa cosiponanta ara convartad with raspact to tha aourca-problam diractlon (radial = parallal to tha ray).