US1962300A - Device for amplifying and diffusing sound - Google Patents

Device for amplifying and diffusing sound Download PDF

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Publication number
US1962300A
US1962300A US332479A US33247929A US1962300A US 1962300 A US1962300 A US 1962300A US 332479 A US332479 A US 332479A US 33247929 A US33247929 A US 33247929A US 1962300 A US1962300 A US 1962300A
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United States
Prior art keywords
walls
room
horn
ceiling
loudspeaker
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Expired - Lifetime
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US332479A
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English (en)
Inventor
Ephraim Armand Fernand
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Individual
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Individual
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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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers

Definitions

  • the present invention relates to apparatus such as loud speakers for wireless telephony, gramophones and other apparatus for reproducing musical sounds, and has for its ,purpose to render such apparatus clearer and agreeable to listen to.
  • the efiect produced by the parasitic sonorities is comparable to the effect of a resonator.
  • the present invention consists in taking as main amplifying element not a metallic horn,
  • the rim of an electrodynamic or electromagnetic loud speaker is joined by means of tapered members to the walls of an auditorium, listening room or the like, whereby said walls become substantially extensions of .the walls of the loud speaker and -constitute together a closed resonator of great size by means of which the reproduced sounds are highly amplified without undesirable distortion.
  • said resonator having a capacity of several cubic meters, the parasitic sounds issuing from the same and mingling with the repro-' *duced sounds will be of the same nature as those which would naturally mingle with the human voice, if a singer would sing in the place and stead of the reproducing apparatus.
  • Artistic auditions are thus obtained giving, if not the rigorous reproduction of the sounds emitted before the radiophonic microphone, at least quite a good imitation capable of giving the illusion of reality.
  • the present invention allows moreover of obtaining very interesting technical advantages.
  • the audition is quite as good, whatever may be the point of the room where the listener is placed, the distribution of the sound being uniform and without privileged direction.
  • Figure 1 shows a perspective view of an arrangement of a loud speaker suspended in an angular space in such a manner that it directs the sound waves within the trihedron formed by two walls and a ceiling.
  • Figures 2, 3 and 4 show respectively a front view, a side view and a plan of the loud speaker horn of special shape shown in Fig. 1.
  • Figure 5 shows diagrammatically, in perspective, view, an upper corner of a locality in which the ceiling is provided with decorative cornices masking the upper edges of the diffusing trihedron.
  • Figures 6, 7 and 8 show, in elevation, profile and plan, respectively, a similar cone to that shown in Figure 1 but modified as to its mouth in order to adapt it to the shape of the cornice.
  • Figure 9 shows, on a plane bisecting the dihedron formed by the walls, a section of a simplified form of cone which can be utilized in the case of ceiling with cornices;
  • Fig. 10 shows a longitudinal diagrammatic section of an auditorium specially furnished according to the principle of the invention.
  • Figures 1 to 4 show an arrangement of loud speaker for wireless telephony which gives the best results (it being understood that the radiophonic emission is pure, that the receiving station does not deform it either at high or low frequencies and that the receiver is suitably chosen).
  • This arrangement comprises a conical tube,a mounted on the telephonic receiver b in the usual manner.
  • This cone is preferably of a very elongated form and of a non-resonant material such as cardboard. It is better still to construct it of several superposed sheets of thick paper or of thin cardboard, the said sheets not being stuck together so as to form a single block, but forming on the contrary quite distinct layers. There is thus obtained a perfect damping of the walls of the cone which results in the elimination of parasitic vibrations.
  • the cone 0 is preferably formed with flattened faces a, Figure 4. forming a rectangular dihedron intended to fit exactly in the dihedron formed by the two right -angle walls m, m. It is formed at its upper part with an arched part or inclined surface a, Figure 3, intended to rest against the ceiling p, which without being indispensable has a very marked effect. It serves to modify the direction of the sound waves without disturbing them. It can be shown indeed that when this arch is omitted. the sounds reflected by the ceiling are returned and at times give place to vexatious interfer- A claw 4' allows the born a to be suspended nail n inserted in the angle of the two at the desired place. It is also satisfacmake a hole in the wall of the horn and it on the nail.
  • Figures 6, 7 and 8 show a form of horn which can be adapted in a satisfactory manner to the more usual form of cornice.
  • the conical horn a and its arch a are "truncated to provide inclined facets a. which permit the horn to be thrust upwardly until the apex of the arch a touches the ceiling.
  • the front part of the horn a is formed with a tongue a which extends close to the ceiling and facilitates, in certain cases, the emission of sound by spreading the sound waves.
  • the trihedron formed by two walls and the floor can be employed to constitute an extension of the walls of the loud speaker.
  • the floor is thus used in place of the ceiling, the difliculties which result from the presence of a corniceand mouldings are avoided. It is however indispensable that the corner utilized for diffusion shall be unobstructed and all furniture should be removed from within a radius of at least two metres. The presence of a carpet is not so favourable and this is why the utilization of the ceiling is considered to be more usual.
  • a loudspeaker adapted to be located in a corner of three walls of a room, comprising a reflecting member adapted to fit substantially all round when in place, with all the walls of the corner, means being associated therewith for positioning said loudspeaker respectively to the walls of the corner, whereby, upon putting the loudspeaker in place any lateral discharge of the vibrating air-column, at the outlet of the loudspeaker, gets prevented by the besetting walls of the room.
  • a loudspeaker provided with a horn having an outlet shapedaccording to the form or the walls and mouldings of a room, with rims adapted to fit, when in place, substantiallyall round with'besetting walls and mouldings, means being associated therewith for positioning said loudspeaker and horn respectively to the walls of the room, whereby upon putting the loudspeaker in place, any lateral discharge of the vibrating air-column, at the outlet of the loudspeaker, gets prevented by the besetting walls ofthe room.
  • a loudspeaker provided with a horn adapted to be located in the trihedron formed by two walls and the ceiling of a room, the flared outlet of said horn being adapted to fit substantially all round, when in place, with said walls and ceiling, means being associated therewith for positioning said loudspeaker respectively to the walls of the trihedron, whereby, upon putting the loudspeaker in place, any lateral discharge of the vibrating air-column, at the outlet of the loudspeaker, gets prevented by the besetting walls of the room.
  • a loudspeaker the combination with a sound producing apparatus of usual type, of a conical horn shaped to adapt it to be vertically suspended in the corner of a room, and of an arched member surmounting the flared orifice of the horn, and exactly fitting in the trihedron formed by the walls and the ceiling of a room, where the ceiling and walls of said trihedron constitute substantially extensions of the walls of the arched member.
  • a loudspeaker means for increasing the length of the vibrating air column, said 'means comprising an arched member shaped according t6 the form of a geometrical trihedron, with its outlines fitting with the three facesof said trihedron, a conical horn fitting with said arched member, and means for hanging said horn vertically in the corner of a listening room, with the arched member setting in the trihedron formed by the ceiling and two adjacent walls of the room, whereby, upon putting the loudspeaker in place, the walls of the room will constitute substantially an extension of the horn.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
US332479A 1928-01-20 1929-01-14 Device for amplifying and diffusing sound Expired - Lifetime US1962300A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR304313X 1928-01-20

Publications (1)

Publication Number Publication Date
US1962300A true US1962300A (en) 1934-06-12

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ID=8888782

Family Applications (1)

Application Number Title Priority Date Filing Date
US332479A Expired - Lifetime US1962300A (en) 1928-01-20 1929-01-14 Device for amplifying and diffusing sound

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US (1) US1962300A (xx)
BE (1) BE357449A (xx)
GB (1) GB304313A (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878887A (en) * 1955-11-29 1959-03-24 Wisconsin Alumni Res Found Acoustical device
NL1019961C2 (nl) * 2002-02-14 2003-08-15 Duran Audio B V Akoestische weergever.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2239570A (en) * 1989-12-20 1991-07-03 * Wild Michael Bath tub radio

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878887A (en) * 1955-11-29 1959-03-24 Wisconsin Alumni Res Found Acoustical device
NL1019961C2 (nl) * 2002-02-14 2003-08-15 Duran Audio B V Akoestische weergever.
WO2003069952A1 (en) * 2002-02-14 2003-08-21 Duran Audio B.V. Acoustic transducer
US20050127783A1 (en) * 2002-02-14 2005-06-16 De Vries Gerard H.J. Acoustic transducer
US7268467B2 (en) 2002-02-14 2007-09-11 Duran Audio B.V. Acoustic transducer

Also Published As

Publication number Publication date
BE357449A (xx)
GB304313A (en) 1930-06-30

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