{
  "$type": "site.standard.document",
  "description": "An active noise attenuation system for an air induction assembly is operably connected to an engine that generates a low frequency noise having a noise profile defining a peak noise. The system has an air inlet duct housing (12) with an inlet (16) and an outlet (18) connected to the engine (19). A…",
  "path": "/patents/1108392",
  "publishedAt": "2001-11-21T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02M35/125",
    "SIEMENS CANADA LTD [CA]"
  ],
  "textContent": "An active noise attenuation system for an air induction assembly is operably connected to an engine that generates a low frequency noise having a noise profile defining a peak noise. The system has an air inlet duct housing (12) with an inlet (16) and an outlet (18) connected to the engine (19). A resonator (30) is supported by the housing and is positioned between a speaker assembly (20) and the engine to attenuate the peak noise resulting in an attenuated low frequency engine noise. A microphone (22) senses the attenuated low frequency engine noise and generates an attenuated low frequency engine noise signal. A controller (26) receives and phase shifts the signal and sends the signal to the speaker to generate a sound field to cancel or reduce the attenuated low frequency engine noise signal.",
  "title": "Resonator for active noise attenuation system"
}