Apparatus for operation in an on-ear mode and an off-ear mode

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic

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Details

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.

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