{
  "$type": "site.standard.document",
  "description": "Engine comprising a flow channel (7) for gaseous fluids having means adapted to vary a sound pressure level of a sound of the gaseous fluids at at least one predetermined frequency, wherein said means comprises at least one side branch tube and/or at least one resonance box (8) for causing…",
  "path": "/patents/1096904",
  "publishedAt": "2003-04-09T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01N1/02",
    "YAMAHA MOTOR CO LTD [JP]"
  ],
  "textContent": "Engine comprising a flow channel (7) for gaseous fluids having means adapted to vary a sound pressure level of a sound of the gaseous fluids at at least one predetermined frequency, wherein said means comprises at least one side branch tube and/or at least one resonance box (8) for causing resonance at the at least one predetermined frequency, wherein an opening of the at least one side branch tube and/or an opening of the at least one resonance box respectively face an external opening (7a) of the flow channel.",
  "title": "Resonance box for sound pressure level modulation for internal combustion engines"
}