US3759345A - Stereophonic sound-reproducing system - Google Patents

Stereophonic sound-reproducing system Download PDF

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Publication number
US3759345A
US3759345A US00210892A US21089271A US3759345A US 3759345 A US3759345 A US 3759345A US 00210892 A US00210892 A US 00210892A US 21089271 A US21089271 A US 21089271A US 3759345 A US3759345 A US 3759345A
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sound
stereophonic
acoustic
base line
frequency section
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US00210892A
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Borisenko A Vladimirovich
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers

Definitions

  • ABSTRACT A stereophonic sound-reproducing system comprising two sound-reproducing sets separated by a base distance and each having ahigh-frequency section and a mid frequency section.
  • the mid frequency section is provided with an acoustic focuser, the acoustic axis of which is so oriented towards the base line as to make the perception of the spatial sound panorama practically independent of thev listeners position on a line parallel to, the base line;
  • the present invention relates to radio engineering and, more specifically, to stereophonic soundreproducing systems.
  • stereophonic sound-' reproducing system in which the stereophonic effect zone is expanded by using sophisticated large-sized reflecting devices, comprising more than two parabolic reflectors for differentsections of the frequency range.
  • stereophonic soundreproducing system comprising more than two soundreproducing sets. As the listener leaves the stereophonic effect zone of the main pair of soundreproducing sets, he enters the stereophonic effect zone of another pair of sets.
  • a system comprising, for instance, four sound-reproducing sets takes much space in the room, for the sets are not set in a line while the increase in thefour set stereophonic system, as compared to the conventional stereophonic systems,
  • the main object of the invention is to produce a stereophonic sound-reproducing system which will considerably expand the stereophonic effect zone while eliminating the distortions of the spatial sound panorama.
  • This object is accomplished by providing the midfre quency section of the stereophonic sound-reproducing system with an acoustic focuser whose acoustic axis is so oriented with respect to the base line as to make the perception of the spatial sound panorama practically independent of the listener's position on a line, parallel to the base line.
  • One of the embodiments of the invention may be realized with an acoustic focuser designed as a laminar acoustic lens the plates of which are set at 40 relative to a 2.4-m long base line.
  • Another embodiment of the invention consists in having the acoustic axis of the high-frequency section oriented at approximately the same angle to the base line as that of the mid-frequency section.
  • a system, realized according to the present invention, with only two sound-reproducing sets makes it possible to expand the stereophonic effect zone practi- Also known in the art is a stereophonic soundreproducingsystem, wherein the stereophonic effect zone is increased by providing the walls of the audition room with special corrugated screens. As a result, the listeners pick up the sounds reflected from the corrugated screens. Thus the sounds, coming directly from the sets, are artificially attenuated, which brings about a drop in localization precision.
  • An object of the present invention is to provide a system which avoids the aforesaid disadvantages.
  • FIG. I is a top plan view showing leftand right-hand mid-frequency sections provided with a laminar acoustic lens:
  • FIG. 2 is a graphical illustration showing optimum directivity patterns of the mid-frequency (rightand lefthand) sections.
  • FIG. 3 is a schematic diagram which illustrates the stereophonic effect zone where a is the stereophonic effect zone of existing systems and b is a stereophonic effect zone of the present system.
  • an increase of the delayed signal level may offset the effect of the time difference Ar on the aural sense of direction. This may be accomplished with the aid of certain directivity patterns of the soundreproducing set sections.
  • the optimum directivity patterns of the sections may be derived from the condition that the position of one of the apparent sound sources, e.g., the central one, remains unchanged as the listener moves parallel to the base line.
  • the directivity of an individual mid-frequency section is much lower than the optimal value. Therefore, an acoustic focuser is required in the mid-frequency range.
  • the required directivity of the mid-frequency section in a horizontal plane is ensured by using, for example, a laminar acoustic lens the design of which depends on the length of the base line selected.
  • the presentstereophonic sound-reproducing systeming filters The overall width of the frequency range, reproduced by the present system, is determined by the selection of highand low-frequency speakers.
  • the mid-frequency sections 1 comprising two speakers 2 each, are supplied with a laminar acoustic lens 3.
  • the acoustic lens 3 With base B 2.4 m long, the acoustic lens 3 has between six and eight parallel plates 4, set at an angle of 40 relative to the base line and diminishing in length in a direction outwardly along the base line.
  • the laminar acoustic lenses 3 impart to the mid-frequency sections 1 certain directivity patterns D,(and D441), shaped on the basis of studying the characteristics of mans aural analyzer.
  • Optimum directivitypatterns 5, 6 and 7 for the left-hand mid-frequency section and 8, 9, 10 for the right-hand mid-frequency section are estimated depending on different base lengths and illustrated in FIG. 2.
  • the difference in directivity factors enables the listener at an arbitrary point A in the audition room to pick up the signals from the distant mid-frequency section at a higher level than from the nearer section.
  • the magnitude and sign of this difference are calculated to compensate for the effect on the hearing organ of the time difference and the intensity difference due to the difference in the distances 1, and 1 from the point A to the mid-frequency sections.
  • the position of each of the apparent sound sources in the stereophonic panorama is practically independent of the listeners position. 1
  • the required directivity at high frequencies between3 and 5 kHz may be provided by the orientation of the acoustic axis of the highfrequency section, shown in dotted outline by numeral 11 in FIG. .1 at roughly the same angle as that of the mid-frequency section. At the same time it is desirable to reduce excessive directivity in the higher-frequency range (over 5 kHz).
  • FIG. 3 illustrates the boundaries of the stereophonic effect zone within which the spatial distortions do not exceed 10 percent, where a-is the stereophonic effect zone of the existing systems and b-is the stereophonic effect zone of the present system. This means that the central apparent source of the perceived spatial sound panorama is displaced by not more than 10.18. As may be seen from FIG. 3, the present system makes it possible to expand the stereophonic effect zone up to percent of the audition room space.
  • the present system produced a stable stereophonic panorama for listeners both on the axis of symmetry of the sound-reproducing sets and away from it.
  • the sound quality of this system is preferred by the vast majority of listeners who are off the symmetry axis of the sound reproducing sets and is estimated as equivalent to the existing stereophonic sound-reproducing systems when positioned on the axis of symmetry.
  • the advantages of the present system are displayed particularly in reproducing stereophonic programs with a complex spatial panorama (e.g., symphonic music) as well as at listening points opposite one of the sound reproducing sets (leftor right-hand).
  • a stereophonic-sound reproducing system comprising: two sound-reproducing units symmetrically positioned on a base line and separated by a base distance, each unit having a mid-frequency section and a high-frequency section, and acoustic focussing means positioned in front of said mid-frequency section, each mid-frequency section having an acoustic axis inclined with respect to the base line, the acoustic axes of both mid-frequency sections facing inwardly in converging fashion and refecting on an axis of symmetry of the units, each acoustic focussing means comprising a plurality of spaced vertical plates extending parallel to the acoustic axis of the respective mid-frequency section, said plates having a length in a horizontal plane which decreases with increased distance of the plates from said axis of symmetry, whereby to make the perception of the spatial sound panorama produced by said units practically independent of the listeners position on a line parallel to the base line.
  • each said high-frequency section is oriented relative to the base line so that the acoustic axis of said high-frequency section is at approximately the same angle to the base line as that of the associated mid-frequency section.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
US00210892A 1971-12-13 1971-12-22 Stereophonic sound-reproducing system Expired - Lifetime US3759345A (en)

Applications Claiming Priority (1)

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GB5780771A GB1368070A (en) 1971-12-13 1971-12-13 Sterophonic sound-reproducing system

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US3759345A true US3759345A (en) 1973-09-18

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US00210892A Expired - Lifetime US3759345A (en) 1971-12-13 1971-12-22 Stereophonic sound-reproducing system

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US (1) US3759345A (enrdf_load_stackoverflow)
DE (1) DE2163321A1 (enrdf_load_stackoverflow)
FR (1) FR2168142B1 (enrdf_load_stackoverflow)
GB (1) GB1368070A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112256A (en) * 1973-08-24 1978-09-05 Stig Carlsson Loudspeaker and stereophonic loudspeaker system
US4133975A (en) * 1975-04-02 1979-01-09 Bose Corporation Loudspeaker system with broad image source with directionality control for the tweeter
US4266092A (en) * 1975-04-02 1981-05-05 Bose Products, Inc. Loudspeaker system with broad image source
US4503553A (en) * 1983-06-03 1985-03-05 Dbx, Inc. Loudspeaker system
US4673057A (en) * 1984-11-13 1987-06-16 Glassco John M Geometrical transducer arrangements
WO1993022889A1 (en) * 1992-04-23 1993-11-11 Vinogradov Alexei V Method and acoustic system for sonification of enclosed and open spaces
US5274709A (en) * 1990-12-22 1993-12-28 Sony Corporation Speaker device for television receiver
US5333202A (en) * 1988-06-09 1994-07-26 Okaya Akira Multidimensional stereophonic sound reproduction system
US5857027A (en) * 1993-08-06 1999-01-05 Gaidarov; Alexandr Sergeevich Loudspeaker
US20050286730A1 (en) * 2004-06-29 2005-12-29 Ira Pazandeh Loudspeaker system providing improved sound presence and frequency response in mid and high frequency ranges
US20080063224A1 (en) * 2005-03-22 2008-03-13 Bloomline Studio B.V Sound System
US8867749B2 (en) 2011-04-18 2014-10-21 Paul Blair McGowan Acoustic spatial projector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2708105B2 (ja) * 1989-04-26 1998-02-04 富士通テン 株式会社 車載用音響再生装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993557A (en) * 1958-09-22 1961-07-25 Rowland L Miller Omnidirectional stereo system
US3105113A (en) * 1960-07-15 1963-09-24 Rca Corp Stereophonic loudspeaker system
US3491204A (en) * 1967-05-12 1970-01-20 Stanley A Sherno Sound system circuit and cabinet assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE453187A (enrdf_load_stackoverflow) * 1942-11-16
US3080012A (en) * 1958-09-26 1963-03-05 Columbia Broadcasting Syst Inc Stereophonic loudspeaker arrays
FR1294509A (fr) * 1960-07-15 1962-05-26 Rca Corp Dispositif d'agencement de haut-parleurs pour récepteurs radiophoniques stéréophoniques

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993557A (en) * 1958-09-22 1961-07-25 Rowland L Miller Omnidirectional stereo system
US3105113A (en) * 1960-07-15 1963-09-24 Rca Corp Stereophonic loudspeaker system
US3491204A (en) * 1967-05-12 1970-01-20 Stanley A Sherno Sound system circuit and cabinet assembly

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112256A (en) * 1973-08-24 1978-09-05 Stig Carlsson Loudspeaker and stereophonic loudspeaker system
US4133975A (en) * 1975-04-02 1979-01-09 Bose Corporation Loudspeaker system with broad image source with directionality control for the tweeter
US4266092A (en) * 1975-04-02 1981-05-05 Bose Products, Inc. Loudspeaker system with broad image source
US4503553A (en) * 1983-06-03 1985-03-05 Dbx, Inc. Loudspeaker system
US4673057A (en) * 1984-11-13 1987-06-16 Glassco John M Geometrical transducer arrangements
US5333202A (en) * 1988-06-09 1994-07-26 Okaya Akira Multidimensional stereophonic sound reproduction system
US5274709A (en) * 1990-12-22 1993-12-28 Sony Corporation Speaker device for television receiver
WO1993022889A1 (en) * 1992-04-23 1993-11-11 Vinogradov Alexei V Method and acoustic system for sonification of enclosed and open spaces
US5857027A (en) * 1993-08-06 1999-01-05 Gaidarov; Alexandr Sergeevich Loudspeaker
US20050286730A1 (en) * 2004-06-29 2005-12-29 Ira Pazandeh Loudspeaker system providing improved sound presence and frequency response in mid and high frequency ranges
US7577265B2 (en) 2004-06-29 2009-08-18 Ira Pazandeh Loudspeaker system providing improved sound presence and frequency response in mid and high frequency ranges
US20080063224A1 (en) * 2005-03-22 2008-03-13 Bloomline Studio B.V Sound System
US8050432B2 (en) * 2005-03-22 2011-11-01 Bloomline Acoustics B.V. Sound system
US8867749B2 (en) 2011-04-18 2014-10-21 Paul Blair McGowan Acoustic spatial projector

Also Published As

Publication number Publication date
FR2168142A1 (enrdf_load_stackoverflow) 1973-08-31
DE2163321A1 (de) 1973-06-28
FR2168142B1 (enrdf_load_stackoverflow) 1975-10-24
GB1368070A (en) 1974-09-25

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