a petrophysical properties analyzing program stored in memory of the computer the method can also include deriving petrophysical properties from the filtered data utilizing a petrophysical properties evaluation algorithm employable to predict one or more petrophysical properties of rock undergoing drilling application_number US 201213554369 A description the present invention will now be described more fully hereinafter with reference to the accompanying drawings which illustrate embodiments of the invention this invention may however be embodied in many different forms and should not be construed as limited to the illustrated embodiments set forth herein rather these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art like numbers refer to like elements throughout prime notation if used indicates similar elements in alternative embodiments when drilling into different lithologies or the same lithology with different properties e g porosity water saturation permeability etc the generated acoustic sounds emanating from the drill bit when drilling into rock are distinctly different the sounds termed as drilling acoustic signals hereafter transmit upward along the drill string according to various embodiments of the present invention a sensor subassembly containing acoustic sensors is positioned above the drill bit and connected to the above drill string the drilling acoustic signals transmit from the drill bit to the sensor subassembly and are picked up by the acoustic sensors the drilling acoustic signals received by the sensors are transmitted generally after amplification to surface by a borehole transmitting system which can.