| contributor author | D. Guicking | |
| contributor author | E. Lorenz | |
| date accessioned | 2017-05-08T23:19:06Z | |
| date available | 2017-05-08T23:19:06Z | |
| date copyright | July, 1984 | |
| date issued | 1984 | |
| identifier issn | 1048-9002 | |
| identifier other | JVACEK-28962#389_1.pdf | |
| identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/99177 | |
| description abstract | An active equivalent of the λ/4 resonance absorber with a porous plate or foil of flow resistance ρc is described. The porous layer is backed by a loudspeaker driven such that zero sound pressure is maintained in the air gap between foil and speaker. The simultaneous control of magnitude and phase has been achieved in analog technique by a combination of open-loop and closed-loop control, utilizing single sideband modulation of the compensation signal with a weak infrasonic auxiliary signal. The on-off ratio of the reflection coefficient reaches −60 dB for sinusoidal sound, and −20 dB for broadband noise. | |
| publisher | The American Society of Mechanical Engineers (ASME) | |
| title | An Active Sound Absorber With Porous Plate | |
| type | Journal Paper | |
| journal volume | 106 | |
| journal issue | 3 | |
| journal title | Journal of Vibration and Acoustics | |
| identifier doi | 10.1115/1.3269206 | |
| journal fristpage | 389 | |
| journal lastpage | 392 | |
| identifier eissn | 1528-8927 | |
| keywords | Sound | |
| keywords | Signals | |
| keywords | Resonance | |
| keywords | Flow (Dynamics) | |
| keywords | Electrical resistance | |
| keywords | Reflectance | |
| keywords | Sound pressure | |
| keywords | Noise (Sound) AND Loudspeakers | |
| tree | Journal of Vibration and Acoustics:;1984:;volume( 106 ):;issue: 003 | |
| contenttype | Fulltext | |