  The paper is devoted to the usage of nearfield acoustic holography methods
for estimating far field of the object. An experiment was carried out in
anechoic chamber. First, acoustic filed was recorded in a plane that was close
to source. This signals records were used to reconstruct the far field by
computation routines. Second, the signal in the far field is measured and the
results are compared. Several methods are tested and research on possible
reduction of the microphone array size is carried out. The most significant
reduction of the measurement facility complexity is usage a linear array in
stead of the planar array that is made possible due to introduced computation
routines
