HELI PLT INADVERTENTLY MISINTERP ATC GND CTLR WHEN MAKING A HOVER TAXI ACROSS AN ACTIVE RWY WHEN ANOTHER ACFT WAS ON FINAL.

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GND HAD REPOSITIONED US VIA HOVER TAXI FROM OUR LOCATION AT THE HELIPAD TO TXWY INTXNS OF TXWY B AND TXWY H. HISTORY HAS SHOWN THAT TWR NORMALLY CLRS US ACROSS THE ARPT DIRECT NNE TO THE HELI TRAINING AREA. TWR CLRED US TO DEPART N ON TXWY B AND WOULD CALL OUR TURN EBOUND. THE ERROR WAS A COMPLETE RESULT OF MY MINDSET. BEING ACCUSTOMED TO DIRECT AIR TAXI I PERCEIVED OUR CLRNC TO BE NEBOUND ON TXWY H. TWR ASKED IF I HAD THE APCHING ACFT ON FINAL IN SIGHT AND GAVE ME THE CLRNC AS STATED ABOVE. WHAT I THOUGHT I HEARD LED ME TO BELIEVE I WAS TO CROSS THE RWY NBOUND. I ASKED THE TWR IF HE WANTED ME TO WAIT AND CROSS BEHIND THE LNDG ACFT OR PROCEED. TWR RESPONDED QUICKLY SAYING THAT I WAS CLRED N ON TXWY B. WITH MY MINDSET OF A DIRECT AIR TAXI TO THE N SIDE OF THE ARPT; I HEARD MY CLRNC EXPRESSED WITH AN URGENCY TO PROCEED NOW! WITHOUT DELAY; I EXECUTED MY AIR TAXI ACROSS THE RWY DOWN TXWY H. ATC WAS VERY CLR ON THE CLRNC; BUT I HEARD WHAT I EXPECTED TO HEAR AS A N DEP. SUBSEQUENTLY; I CROSSED THE ACTIVE RWY AND CROSSED IN FRONT OF THE LNDG ACFT. THIS INCURSION DID NOT RESULT IN ANY DEV REQUIRED BY THE LNDG ACFT; FORTUNATELY! THIS INCIDENT HAS BEEN A VERY GOOD LESSON ON LISTENING TO AND UNDERSTANDING YOUR CLRNC EACH TIME. I SET MYSELF UP WITH CERTAIN EXPECTATIONS AND HAD ALREADY MADE MY MIND UP. LISTEN; LISTEN; LISTEN. UNDERSTAND -- AND ONLY THEN DEPART AS CLRED. HAD I DONE SO; THIS WOULD NOT HAVE BEEN AN INCIDENT.