EP 0774749 B1 20031008 - Active sound attenuation system for a vehicle
Title (en)
Active sound attenuation system for a vehicle
Title (de)
Aktives Schallabsorptionssystem für ein Kraftfahrzeug
Title (fr)
Dispositif actif d'atténuation acoustique pour un véhicule
Publication
Application
Priority
DE 19543128 A 19951118
Abstract (en)
[origin: EP0774749A2] The system uses a sound pressure sensor or microphone which is connected with a regulator and a loudspeaker. In the regulating circuit, the input is the sound pressure of the interference inside the motor vehicle (Pst r). The feedback is the sound pressure from the active sound absorption system (Pactives system). The difference between the input and the feedback, is the actual pressure inside the motor vehicle (Pges). This is then fed to three series connected filters. The first filter (HMik) represents the transfer function of the microphone and the second filter (HRegler) represents the transfer function of the regulator. The third filter represents (HLS) the transfer function of the loudspeaker. The second filter gives an output signal (ULS) to the loudspeaker, deflecting the membrane by the amount (xLS), used as feedback with the transfer function (HLS-Mik) to form the sound pressure from the active sound absorption system (Pactive system).
IPC 1-7
IPC 8 full level
G10K 11/178 (2006.01)
CPC (source: EP US)
G10K 11/17813 (2017.12 - EP US); G10K 11/17835 (2017.12 - EP US); G10K 11/17875 (2017.12 - EP US); G10K 2210/1282 (2013.01 - EP); G10K 2210/3012 (2013.01 - EP); G10K 2210/3025 (2013.01 - EP); G10K 2210/3026 (2013.01 - EP); G10K 2210/3028 (2013.01 - EP); G10K 2210/3033 (2013.01 - EP); G10K 2210/503 (2013.01 - EP)
Designated contracting state (EPC)
DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0774749 A2 19970521; EP 0774749 A3 19990728; EP 0774749 B1 20031008; DE 19543128 A1 19970522; DE 59610759 D1 20031113; ES 2207661 T3 20040601
DOCDB simple family (application)
EP 96116233 A 19961010; DE 19543128 A 19951118; DE 59610759 T 19961010; ES 96116233 T 19961010