Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Patent
1996-04-15
1999-01-05
Kuntz, Curtis A.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Plural or compound reproducers
381188, 381205, 381 24, 381160, H04R 2500
Patent
active
058570276
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
This invention relates to the field of electroacoustics and specifically concerns loudspeakers.
PRIOR ART
A loudspeaker is known which comprises 2N (where N.gtoreq.3) transducer heads connected in-phase and located in a horizontal plane in pairs and coaxially, one in front of the other, with the equally increased distance between the paired heads toward the listener (SU, A, 936462).
The above loudspeaker does not provide voluminosity and directivity of sound.
A loudspeaker is known which comprises three two-aperture radiators, each containing a pair of identical coaxial in-phase counter-radiating apertures (U.S. Pat. No. 4,182,931).
This structure of the loudspeaker features an increased irregularity of frequency response, vertical direction of radiation and an insufficient "effect of presence".
Identical in-phase counter-radiating apertures are hereinafter understood as radiators of equal geometry (indiscernible within the perception thresholds), equal acoustic characteristics and in-phase radiation of apertures.
DISCLOSURE OF THE INVENTION
The invention is based on the task to develop a loudspeaker with a structure which allows to decrease irregularity of frequency response and radiation directivity in a vertical plane, providing an "effect of presence" prerequisites for which are provided for by two-aperture counter-radiation.
This is achieved by the fact that in a loudspeaker comprising at least one two-aperture radiator containing a pair of identical coaxial in-phase counter-radiating apertures in accordance with the invention the two-aperture radiator formed by a pair of identical coaxial in-phase counter-radiating apertures comprises apertures facing each other, their geometrical axes being vertical, whereas the distance between the apertures equals at least our, radius of the aperture but does not exceed the wavelength of the lowest frequency reproduced by the pair, and the two-aperture radiator reproduces at least middle-range frequencies.
In a loudspeaker additionally comprising a high-frequency band radiator with a pair of identical coaxial in-phase counter-radiating apertures these apertures may be located between the apertures of the middle-range frequency radiator coaxially and symmetrically, whereas the cross-section area of the high-frequency band radiator may ba equal to no more thin 0.7 of the radiation aperture area of the middle-range frequency radiator.
In a loudspeaker additionally comprising a low-frequency band radiator the latter may be located so that its acoustic axis is situated in a vertical plane running through the acoustic axis of tile loudspeaker.
This structure of the loudspeaker being claimed allows to improve the quality of sonification as far as voluminosity and the "effect of presence" are concerned. It also dramatically improves discernibility (articulation) of sound, its lucidity, providing a possibility to precept the sound of each instrument in the orchestra being in hall environment,
Solution of the above task required results of investigations carried out in the field adjacent to technical acoustics: psychophysiology of sound perception.
An analysis of psychophysiological features of sound perception indicates that voluminosity of sonification is conditioned by both non-directivity of radiation and non-correlated noise containing the program signal. The main component of signal-correlated noise is intermodulation prevailing is loudspeakers as the Doppler intermodulation. The essence of the Doppler intermodulation is change of high-range frequency components by the membrane being displaced by low-frequency signals (the effect of changing whistle tone of train moving with respect to the listener).
To eliminate the Doppler component of intermodulation which is most noticeable in the middle-frequency range, the two-aperture radiator comprising two identical in-phase excited and facing each other apertures is connected to a middle-frequency source, while geometrical axis of its apertures is positioned vertically. This results in mutual compe
REFERENCES:
patent: 3608665 (1971-09-01), Drisi
patent: 3715008 (1973-02-01), Lover
patent: 3759345 (1973-09-01), Borisenko
patent: 5253301 (1993-10-01), Sakamoto et al.
patent: 5526456 (1996-06-01), Heinz
Gaidarov Alexandr Sergeevich
Vinogradov Alxei Vladimir
Barnie Rexford
Kuntz Curtis A.
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