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Department of Engineering, ICT and Technologies for Energy and Transport Patent Title PrŽcess and apparatƵs Žf a mƵůƟchannel aƵĚŝŽ system fŽr ĂĐƟve playback Žf ĂĐŽƵsƟc ƋƵadraphŽnic ƐŽƵŶd events. Ref. CNR 1888 Assignee(s): CNR CNR InƐƟƚute: IDASC Main Inventor: Domenico Stanzial Countries: IT Priority date: 06/03/2008 Abstract The invenƟŽn deĮnes the prŽcess and the eƋƵŝƉment needed fŽr playinŐ back ƋƵadraphŽnic sŽƵŶd. This ƉƌŽĐess is ĚŽŶĞ via an electrŽ-ĂĐŽƵsƟc device called ΗƋƵĂĚƌĂƉŚŽnic player“, capable Žf perĨŽrminŐ the feed-fŽrward ĂĐƟve cŽŶtrŽů Žf sŽƵŶĚƐ. The reprŽĚƵced sŽƵŶd is Őenerated frŽm ŽŶe Žr mŽƌĞ speakers fed by sƵitable electrical vŽůƚĂŐĞ sŝŐŶĂůs, ŵĞĂƐƵƌĞĚ and caůĐƵůĂƚĞd by the device itself. The sŽƵŶd ĨƌŽŵ the ƋƵĂd-player is ĂƵƚŽmĂƟĐally adapted ƚŽ the ĂĐŽƵsƟĐ characterisƟĐƐ ŽĨ the lisƚĞŶŝŶŐ rŽŽŵ in ŽƌĚĞƌ tŽ recŽŶstrƵct, ŽƉƟmally, accŽrdinŐ tŽ an alŐŽrithm based Žn least sƋƵares, the ŽriŐŝŶal sŽƵnd event (virtƵal acŽƵsƟcsͿ. Background The inveŶƟŽn ĐŽŶsƟƚƵƚes the ĮŶal rŝŶŐ ŽĨ the chain that beŐŝŶƐ with the reĐŽrĚŝŶŐ prŽcess (patenteĚͿ ŽĨ a ƋƵĂĚraƉŚŽnic "sŽƵŶĚ event“. This is ŝĚĞŶƟĮĞd with the set ŽĨ the ĨŽƵƌ ĂƵĚŝŽ tracks ĐŽƌƌĞsƉŽŶĚŝŶŐ ƚŽ the sŽƵŶd pressƵre siŐnal and the three cŽmƉŽŶents ŽĨ the veůŽcity siŐnal ŽĨ the air parƟcle. Technology The inveŶƟŽn refers ƚŽ the aƉƉůŝĐĂƟŽn ŽĨ sŽƵŶd intensimetric teĐŚŶŝƋƵes ĨŽƌ ŵƵůƟĐŚĂnnel reĐŽƌĚŝŶŐ and playback systems. The teĐŚŶŽůŽŐy fŽƌĞsees the Ƶse Žf pressƵre-vĞůŽĐŝƚypƌŽďĞƐ with ŚŝŐŚ-Įdelity aƵdiŽ ƋƵĂůŝƚy and acƟve speakers able ƚŽ cŽŶƚrŽů the acŽƵsƟc impedance at the listeninŐ ƉŽŝŶt (sweet spŽƚͿ͘ Advantages and ApplicaƟons The ƋƵĂĚƌĂƉŚŽnic player allŽws ƚŽ achieve the ŚŝŐŚest accƵracy in the reprŽĚƵĐƟŽn Žf the sŽƵŶĚ, even in ƌŽŽŵƐ ĂĐŽƵsƟĐĂůůy very diīerent ĨƌŽŵ the ŽƌŝŐŝŶĂů͘ It is able Žf ƌĞƉƌŽĚƵĐŝŶŐ sŝŶŐůe-pŽŝŶƚ ƌĞĐŽƌĚĞd sŽƵnd event (perspecƟve ƋƵĂd-playbackͿ and mƵůƟ-ƉŽŝŶƚ recŽrded sŽƵŶĚ events ;ŚŽůŽŐƌĂphic ƋƵad-playbackͿ. DĂŝŶ ĂƉƉůŝĐĂƟŽŶƐ ĂƌĞ ŝŶ ƚŚĞ ĮĞůĚƐ ŽĨ ĂĐŽƵƐƟĐ ǀŝƌƚƵĂů ƌĞĂůŝƚLJ͕ ĂƌƟƐƟĐ ĂƵĚŝŽǀŝƐƵĂů ƉĞƌĨŽƌŵĂŶĐĞƐ ĂŶĚ ŵƵƐŝĐ prŽĚƵĐƟŽn. Development stage The inveŶƟŽn is ĐƵƌrently at the staŐe ŽĨ “prŽŽĨ Žf ĐŽŶĐept” and was realized experimentally Žnly in 1-D test envirŽnments. &Žƌ its ƉƌŽƚŽƚLJƉŝŶŐ ŽŶĞ ƌĞƋƵŝƌes instƌƵŵeŶƚĂƟŽn ŶŽƚ yet deveůŽƉed ďŽƚh in the recŽrdinŐ phase Žf the sŽƵŶd event (hi-Į p-v prŽďesͿ and in the playback (ĂĐƟve cŽŶtrŽů speakers ŽĨ acŽƵsƟc impedanceͿ. 9