Sound reproduction device with active noise compensation

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers

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381 711, 381187, H04R 2500

Patent

active

058091564

ABSTRACT:
A sound reproduction device such as a headphone with active noise compensation has a housing and a transducer for converting electrical signals to sound waves is disposed within the housing. The transducer has a diaphragm for separating the volume (V.sub.2) in front of the diaphragm from the volume (V.sub.1) to the rear of the diaphragm. The transducer diaphragm and rear volume (V.sub.1) have a determined compliance. The sound reproduction device includes active noise compensation components for reducing unwanted noise at the output of the transducer. The diaphragm has a compliance (N.sub.M) which is less than the compliance (N.sub.1) of the rear volume (V.sub.1). The diaphragm is preferably constructed from a plurality of layers. In a further preferred arrangement, a damping element is disposed very close to the rear side of the diaphragm. A preferred construction for optimizing the voice coil is described. In an active noise compensation construction employing a microphone having a central axis for picking up noise, a preferred arrangement orients the central microphone axis at an angle of about 45.degree. relative to the central axis of the transducer.

REFERENCES:
patent: 3098307 (1963-07-01), Caldwell
patent: 4107479 (1978-08-01), Heil
patent: 4140203 (1979-02-01), Niguchi
patent: 4276452 (1981-06-01), Suyama et al.
patent: 4570746 (1986-02-01), Das et al.
patent: 4922542 (1990-05-01), Sapiejewski
patent: 5162619 (1992-11-01), Thiele
patent: 5185807 (1993-02-01), Bergin
Article "Larm kontra Larm", Elektronik 19/1992, pp. 44-48.

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