audio equipment, namely speaker systems, headphone systems, and recording apparatus, comprising amplifiers, filters, cross-talk cancelers, and/or microchips containing circuits for processing audio signals * , and/or computer programs for processing audio signals * for producing three-dimensional sound

'amplifi':12 'and/or':18,26 'apparatus':10 'audio':1,24,31 'cancel':17 'circuit':21 'compris':11 'comput':27 'contain':20 'cross':15 'cross-talk':14 'dimension':37 'equip':2 'filter':13 'headphon':6 'microchip':19 'name':3 'process':23,30 'produc':34 'program':28 'record':9 'signal':25,32 'sound':38 'speaker':4 'system':5,7 'talk':16 'three':36 'three-dimension':35

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