Dry acoustic system preventing condensation

Details Dry acoustic system preventing condensation Dry acoustic system preventing condensation

1993-07-13

1995-08-29

Dang, Khanh

Acoustics

Sound-modifying means

By wave interference

F01N 106

Patent

active

054462495

ABSTRACT:
An active noise control system is provided for cancellation of noise in a duct. A speaker is mounted over an opening in the duct. An enclosure is mounted the duct about the speaker. Air flow is generated through the enclosure in order to balance the diffusion of water vapor through the speaker such that the dew point of the air in the enclosure is always below the temperature of the air in the enclosure, thus avoiding condensation.

REFERENCES:
patent: 4665549 (1987-05-01), Eriksson et al.
patent: 5044464 (1991-09-01), Bremigan
patent: 5063598 (1991-11-01), Geddes
patent: 5088575 (1992-02-01), Eriksson
patent: 5097923 (1992-03-01), Ziegler et al.
patent: 5176114 (1993-01-01), Brackett
S. Himori, H. Saito and S. Onizawa, "Loudspeaker for High Temperature Environment", International Symposium on Active Control of Sound and Vibration, Apr. 9-11, 1991, Tokyo, Japan (and English language translation).

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