Active noise control using an array of plate radiators and acoustic resonators

An active noise control subassembly array for reducing source noise caused by a source independent of said array, said array comprising:

• a) a pair of active noise control subassemblies each including:
• 1) a piezoceramic-driven noise radiating panel bendably vibratable to generate a panel noise canceling at least a portion of the source noise and having a panel resonating frequency;
• 2) a front plate spaced apart from said panel, disposed generally between said source noise and said panel, and having a sound exit port;
• 3) a first pair of spaced-apart side walls each generally abutting said panel and said front plate so as to generally enclose a front cavity to define a resonator having a resonator resonating frequency;
• 4) a back plate spaced apart from said panel with said panel disposed generally between said source noise and said back plate;
• and
• 5) a second pair of spaced-apart side walls each generally abutting said panel and said back plate so as to generally enclose a back cavity, wherein said pair of subassemblies are spaced apart to create a space between adjacent side walls of said pair of subassemblies;
• and
• b) a third active noise control subassembly including:
• 1) a piezoceramic-driven noise radiating sheet bendably vibratable to generate a sheet noise canceling at least a portion of the source noise and having a sheet resonating frequency, said sheet spaced apart from said back plates of said pair of subassemblies;
• and
• 2) a third pair of spaced-apart side walls each generally abutting said sheet and a corresponding back plate of said pair of subassemblies so as to generally enclose a foreground cavity to define a resonator having a resonator resonating frequency and with said space defining a sound exit port.