Buuxi weedha soo socota: asalka theâtrophone waxaa loo raad raaci karaa nidaamka gudbinta telefoonka oo uu soo bandhigay Clément Ader 1881
Bandhigga Caalamiga ah ee Korontada ee Paris. Nidaamka waxaa daah furay madaxweynihii Faransiiska Jules Grévy, wuxuuna oggolaaday baahinta riwaayadaha ama riwaayadaha. Ader wuxuu diyaariyay 80 qalabka telefoonka ee horteeda ah si uu u abuuro nooc ka mid ah codka binaural stereophonic. Waxay ahayd nidaamkii ugu horreeyay ee maqalka laba-kanaal ah, waxayna ka koobnayd taxane ah gudbiyeyaal taleefan oo ku xiran marxaladda Paris Opera ilaa qolyo ku yaal Paris Electrical Exhibition, halkaas oo booqdayaashu ay ka maqli karaan Comédie-Française iyo bandhigyada opera ee stereo iyagoo adeegsanaya laba sameecadood; Opera wuxuu ku yaalay in ka badan laba kiiloomitir meel ka fog goobta. Qoraal uu qoray 11kii Nofeembar 1881, Victor Hugo wuxuu ku tilmaamay khibradiisa ugu horreysa ee theatrophone inuu ahaa mid raaxo leh.