Intake sound control apparatus
US5446790A · kind A · utility
30Cited by
10References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1993 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Dec 13, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/51
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A device for cancelling annoying sounds caused by operation of an internal combustion engine. An intake sound of the engine, and also a rotational speed of the engine, are obtained. The phase difference between the present intake sound and a desired intake sound is obtained using map data. The map data depends on the rotational speed of the engine and is specifically calculated so that at least the (n+0.5) harmonics (n integer.gtoreq.0) are cancelled. The phase data is used to drive a ceramic speaker or two oppositely directed ceramic speakers, to appropriately compensate the input sound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.