专利名称：Method and apparatus for the focalisation
of acoustic waves
发明人：FINK, MATHIAS,LEWINER, JACQUES申请号：EP99111417.4申请日：19960711公开号：EP0944035A2公开日：19990922
专利附图：
摘要：The method is for broadcasting announcements in an open area (101), andinvolves utilising the loudspeaker (102) by which broadcasts are made within the area, andsensed at a number of points (j). Calculations are carried out for each target zone (123),
between a loudspeaker (i) and calibration points. An impulse response is produced tocompensate for echoes and attenuation, time inverted and the resulting sound
broadcast. The loudspeaker emits a signal: si(t) = Summation fromj of (aj.hij(-t)*S(t) where.hij(t) represents the temporal inversion of the impulse response hij(t), preestablishedand memorised, between the loudspeaker i and a point j predetermined from calibrationsbelonging to the target zones (114,115,123), including a number of calibration points p.
申请人：SOCIETE POUR LES APPLICATIONS DU RETOURNEMENT TEMPOREL
地址：35, rue Tournefort 75005 Paris FR
国籍：FR
代理机构：Loisel, Bertrand
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