Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Patent
1999-05-11
2000-12-12
Kuntz, Curtis A.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
381322, 381345, 381386, 381431, 181148, 181160, 181184, H04R 2500
Patent
active
061608971
ABSTRACT:
An apparatus (1) is constructed for operation in an on-ear mode and an off-ear mode and includes a housing wall (6) having passages (15) to allow useful sound waves to pass through, and additional passages (16) to allow the passage of sound waves which are in phase opposition to the useful sound waves and includes, behind the housing wall (6), an electroacoustic transducer (7) having a diaphragm (12), the transducer (7) being accommodated in an acoustically substantially impervious holder compartment (17). Sound-pressure frequency response influencing structures (18, 19) are arranged both in the sound path between the frontside (13) of the diaphragm (12) and the passages (15), and in the sound path between the rearside (14) of the diaphragm (12) and the additional passages (16).
REFERENCES:
patent: 4944017 (1990-07-01), Cognasse et al.
patent: 5199005 (1993-03-01), Forsberg
patent: 5303209 (1994-04-01), Frasl
patent: 5524151 (1996-06-01), Bleim
patent: 5903076 (1999-05-01), Suyama
patent: 5953436 (1999-09-01), Zimmermann
patent: 6075866 (2000-06-01), Frasl et al.
Biren Steven R.
Kuntz Curtis A.
Ni Suhan
U.S. Philips Corporation
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