Acoustics – Diaphragm and enclosure – With horn
Patent
1998-01-08
2000-06-27
Dang, Khanh
Acoustics
Diaphragm and enclosure
With horn
181192, H05K 500
Patent
active
06079514&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an acoustic horn transducer. It is known that in the greater part of acoustic reproduction systems for high fidelity and for professional use, it is convenient to divide the audio range that is comprised between 20 Hz and 20000 Hz in numerous ways, using different types of acoustic transducers, applying the most suitable so as to reproduce the range of frequencies in the most correct way possible; for example a "woofer" loudspeaker is used for the lounger frequencies, a "midrange" loudspeaker for the medium frequencies and a "tweeter" loudspeaker for the high frequencies.
Conventional horn transducers offer, if compared to dome type transducers, the fundamental characteristic of projecting the sound with greater speed through the air, but with a punctiform image and often with a nasal timbre, making the entire system not very pleasant to listen to; on the contrary dome transducers have a good sound emission, but with lower sonorous impact, of "low efficiency", thus making rather approximate the sonority and the timbre dynamics of musical instruments.
SUMMARY OF THE INVENTION
The aim of the present invention is that of indicating how it is possible to realise an acoustic horn transducer which represents an improvement of the known devices.
For reaching such aim the present invention has as its subject an acoustic transducer as hereinafter described.
Further characteristics and advantages of the acoustic transducer according to the invention will result in being clear from the description that follows and from the annexed drawings, supplied purely as an explanatory and non-limiting example, wherein:
DESCRIPTION OF THE DRAWINGS
FIG. 1 represents the diffuser (horn) in a three dimensional view according to the invention;
FIG. 2 represents a sectioned view of the complete transducer with the wooden horn, indicated with number 1, and the "driver", indicated with number 2;
FIG. 3 represents a plan view of the transducer seen from above.
DESCRIPTION OF THE PREFERRED EMBODIMENT
After detailed studies and research the applicant has perfected a new transducer system for the sole reproduction of the medium high frequencies in order to realise two-way sonorous reproduction systems, that confer to the acoustic reproduction system the fundamental characteristic of remarkably reducing the cross distortions between the "midrange" loudspeaker and the "tweeter" loudspeaker that, as is known, reproduce the medium high part in a reproduction system.
Furthermore such transducers for the sole reproduction of the medium high frequencies, replace the two usual transducers with one only.
As a consequence of the drawbacks of the aforementioned transducers the applicant has perfected a new transducer with a wooden horn having the following characteristics: knots, inasmuch it is the only material that is able to give the transducer the most correct timbre possible (nobody has ever seen a violin in a plastic or metallic material); wooden diffuser 1 (note in particular the curve of the exponential type described in FIG. 2) confers to the transducer the characteristic of radiating sounds in an uniform and constant way; used, the typical resonance has been eliminated in the range of frequencies that go from 1000 Hz to 2000 Hz which confers to the conventional horn systems the typical nasal sound and punctiform.
Together the constructive characteristics of the transducer according to the invention (diffuser with a conic profile of the exponential type being of 360.degree. realised in knotless wood) confer to the transducer, as resulting from exhaustive practical listening tests with all kinds of music and with sounds coming from live microphonic recordings, a reproduction of very high timbre quality and of dynamics being very near that offered by musical instruments listened to live.
The realisation of the wooden horn is carried out starting from a single wooden block, appropriately working it on a lathe, until its profile is that as shown in FIG. 2. As can be seen in F
REFERENCES:
patent: 2873812 (1959-02-01), Avedon
patent: 4031337 (1977-06-01), Okamura et al.
patent: 4206831 (1980-06-01), Welch et al.
patent: 4673057 (1987-06-01), Glassco
patent: 5889876 (1999-03-01), Billings
Dang Khanh
Zingali S.N.C.
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