Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Patent
1993-05-24
1995-08-29
Kuntz, Curtis
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Plural or compound reproducers
381154, 181199, H04R 2500
Patent
active
054467934
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a method of improving the quality of mono or stereo sound reproduction.
It also concerns apparatus for carrying out the method.
Various devices are currently used to reproduce sound. They usually comprise two "enclosures" comprising one or more electro-acoustical transducers called "loudspeakers". Each enclosure usually houses three loudspeakers respectively emitting low, medium and high frequencies. The loudspeakers employ various materials or technologies with a view to improving the reproduction of sound. The "timbres" of these loudspeakers are nowadays very close to the original sound but the problem of spatial resolution has not been solved. These loudspeakers do not reproduce the recorded sound faithfully because they emit sound in one direction only which is always perpendicular to the open side of the enclosure and the same as the direction in which the conical diaphragm of the loudspeaker diverges (this single direction corresponds to the emission denoted E.sub.1 hereinafter, see FIG. 1 in particular). These enclosures are cavities closed on five sides and the loudspeakers are always placed facing the open side, in other words the main axis of the conical diaphragm of the loudspeaker is always perpendicular to the open side of the cavity.
Also known are devices using so-called "bass reflex" enclosures which emit sound in two directions, a forward direction corresponding to the direction in which the diaphragm diverges (as in the loudspeaker emitting sound in a single direction) and a rearward direction (corresponding to the emission E.sub.2 hereinafter, see FIG. 1 in particular); however, this rearward emission follows a particular path in the enclosure in order to render it in phase with the forward wave. Whether these prior art devices provide a single emission direction or two emission directions, a sound is never reproduced homogeneously.
An object of the present invention is to reproduce sounds homogeneously and to improve the resolution and in particular the spatial resolution of the sound by creating sound pressure level differences between different sound emission directions.
SUMMARY OF THE INVENTION
The present invention consists in a method of reproducing sound using at least one electro-acoustic transducer which may be of any known type.
The invention consists in causing the transducer(s) to emit sound in three mutually perpendicular directions, a forward emission (E.sub.1), a rearward emission (E.sub.2) and a sideward emission (E.sub.3) in quadrature with the other two.
A first embodiment of this method causes a transducer to emit sound in the three directions, the three sound emitting areas being then entirely sealed from each other.
Another embodiment of the method causes one transducer to emit sound in two directions, the two sound emitting areas being sealed from each other, and one transducer to emit sound in a third direction corresponding to the sideward emission.
The present invention also consists in apparatus for reproducing sound comprising at least one electro-acoustic transducer and a tube open at both ends in which the transducer is disposed perpendicularly to the axis of the tube.
According to the invention this apparatus comprises a cavity open on one side, the main axis of the transducer being parallel to the open side of the cavity, the emission of sound from this transducer being then mainly sideward.
According to another feature of the invention the transducer is located half in the tube and half in the cavity, a seal being then provided between the cavity and the tube, the part of the transducer in the tube dividing the latter into a front part providing forward emission of sound and a rear part providing rearward emission of sound, these two parts being sealed from each other.
Another embodiment comprises two transducers, one transducer housed in a tube providing the frontward and rearward emission of sound and one transducer housed in a cavity providing the sideward emission of sound.
Another embodime
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Perrichon Claude A.
Piccaluga Pierre
Kuntz Curtis
Le Huyen D.
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