Design and development of active and passive filters for hearing protection devices; design and development of hearing protection devices, headphones and in-ear monitors

'activ':5 'design':1,13 'develop':3,15 'devic':12,19 'ear':24 'filter':8 'headphon':20 'hear':10,17 'in-ear':22 'monitor':25 'passiv':7 'protect':11,18

Headphones not for medical purposes; earphones not for medical purposes; in-ear monitors not for medical purposes; assistive listening devices not for medical purposes

'assist':19 'devic':21 'ear':13 'earphon':6 'headphon':1 'in-ear':11 'listen':20 'medic':4,9,17,24 'monitor':14 'purpos':5,10,18,25

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