System for cancelling sound waves

Details System for cancelling sound waves System for cancelling sound waves

1996-07-18

1997-12-30

Dang, Khanh

Acoustics

Sound-modifying means

By wave interference

381 71, F01N 106

Patent

active

057033374

ABSTRACT:
An area between a gas exhaust pipe (23) and the front side (26) of a diaphragm (14) near the magnet system (11) is closed off by means of a corrugated cover (27). The presence of the cover (27) prevents acoustic short circuits between the front side (26) and a rear side (28) of the diaphragm (14). Since furthermore the end of the gas exhaust pipe (23, 23'), which protrudes into a space (25), does not reach the end of the diaphragm (14) which is connected with a bead (31), such a loudspeaker (10) can operate at very low continuous output.

REFERENCES:
patent: 5233137 (1993-08-01), Geddes
patent: 5255321 (1993-10-01), Murray et al.
patent: 5272286 (1993-12-01), Cain et al.
patent: 5466899 (1995-11-01), Geisenberger

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