 Interface to a programmable logic controller |
| The present invention provides an interface for accessing, controlling and monitoring a programable ... |
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| HDTV receiver |
| FIG. 1 presents a high definition television (HDTV) format disclosed in the aforementioned related ... |
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| Optical fiber seal verifying system |
| OF THE INVENTION An embodiment of the present invention will be described below with reference to ... |
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| Phased digital filtering in multichannel environment |
| A specimen, such as automobile, being subjected to simulated road conditions, is mounted at its ... |
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| Audio mixing console |
| The audio mixing console achieving the above described object of the invention comprises, operators ... |
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| Electro-mechanical transduction apparatus |
| To accomplish the foregoing and other objects, features and advantages of the invention there is ... |
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| Flextensional metal-ceramic composite transducer |
| OF THE INVENTION Referring to FIG. 1, a first embodiment of the transducer of the invention ... |
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| Electroacoustic transducers comprising vibrating panels |
| OF THE INVENTION Referring to FIGS. 1 and 2, the first embodiment of electro-acoustic transducer ... |
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Acoustic apparatus
| Details |
Inventors: Ono, Hiroshi;
Assignee:
Primary Examiner: Gellner; Michael L.
Assistant Examiner: Noh; Jae N.
Attorney, Agent or Firm: Wegner, Cantor, Mueller & Player
An acoustic apparatus adapted to be heard only by a specific person or persons in one space without being worn by the user as in the case of an earphone. Sounds issuing from the apparatus do not leak to the outside and are not affected by the surrounding noise. Basically, the apparatus is arranged such that a sound source is disposed in one focus of a reflector having an ellipsoidal surface of revolution, and sounds are heard at the other focus. To increase the number of specific hearers, if the central portion of the reflector is made into a non-ellipsoidal surface of revolution, or a cross section having an ellipsoidal surface of revolution is extended orthogonally to the cross section by a predetermined length, the range of the other focus expands. In addition, by arranging a plurality of reflectors, it is possible to hear different sounds within the effective areas of the respective reflectors without mutual interference of the sounds. |
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DETAILED DESCRIPTION Accordingly, a primary object of the present invention is to provide an acoustic apparatus with a reflector which is capable of amplifying sounds and focusing them so as to be heard only within a specific area without the user using an earphone, without needing to be worn by the user, and without affecting surrounding people and so on as in the case of a general speaker, thereby overcoming the above-described drawback of the conventional art.
A second object of the present invention is to provide an acoustic apparatus which allows a sound source to be positioned irrespective of the aforementioned acoustic apparatus, and which does not disturb a sound field, which could otherwise occur depending on the size of a sound source device, such as a loudspeaker, installed within the effective range of the reflector.
A third object of the present invention is to provide an acoustic apparatus which is capable of specifying a plurality of persons to hear the sounds.
Furthermore, in the arrangement of the above-described conventional loudspeakers, there is a problem in that even if an attempt is made to satisfy a demand for selecting from a plurality of different sounds in one space, the sounds become mixed with each other, cannot be discriminated, and become mere dual sounds or noises.
The present invention overcomes this problem as well, and a fourth object of the present invention is to provide an acoustic apparatus which makes it possible for the user to select from a plurality of kinds of sound in one space.
In accordance with the present invention, the aforementioned primary object is attained by a first aspect of the invention according to which there is provided an acoustic apparatus comprising: a reflector whose inner surface is provided with part of an ellipsoidal surface of revolution having two foci; and a sound source disposed at one of said foci, whereby sounds reflected by said reflector are made to converge into the other focus.
In accordance with this first aspect of the invention, since an ellipsoidal surface of revolution has two foci, sounds issuing from the sound source placed at one focus are transmitted to the user located at the other focus in converged form, and sounds can be heard positively and in amplified form
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Audio Signal Processing 
