as seen in fig4 the real time monitoring mode is engaged and the piezo foil elements and associated circuitry are fully operational at all times if the switch is moved in the direction shown by the arrow 52 in fig4 to its second position not shown its operation becomes dependent upon the mode of operation currently being performed within the washing compartment 12 of the dishwasher 10 such mode circuitry is illustrated generally at 50 it will be apparent to those skilled in the dishwasher control electronics art that the present invention is easily adaptable to such control circuitry for choosing the operational mode of the noise reduction apparatus 26 of the present invention in light of the operational mode of the dishwasher 10 in operation and with reference to fig3 and 4 an operator may select the real time or coordinated mode using the selector switch 44 if the real time mode is chosen the sensors 24 a 24 l as seen in fig3 are in constant operation so long as the dishwasher is operational as selected by the basic control switches 48 if the coordinated mode is chosen using the selector switch 44 operation of the present apparatus is ongoing in coordination with the dishwasher operational modes whatever the selection when the present apparatus is active the sensors 24 a 24 l receive sound pressure waves from the noise generating components and are excited thereby to convert the sound pressure wave energy into an electric current known herein as a sound signal as is the nature of the passive system described herein the sound signal may then be.