GB1350051A - Enclosure for loudspeakers - Google Patents

Enclosure for loudspeakers

Info

Publication number
GB1350051A
GB1350051A GB1350051DA GB1350051A GB 1350051 A GB1350051 A GB 1350051A GB 1350051D A GB1350051D A GB 1350051DA GB 1350051 A GB1350051 A GB 1350051A
Authority
GB
United Kingdom
Prior art keywords
loud
speaker
base
shelf
sound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teire J M
Original Assignee
Teire J M
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Teire J M filed Critical Teire J M
Publication of GB1350051A publication Critical patent/GB1350051A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
    • H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers
    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/227—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band
    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2842—Enclosures comprising vibrating or resonating arrangements of the bandpass type for loudspeaker transducers
    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
    • H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/34—Directing or guiding sound by means of a phase plug

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

1350051 Loud-speaker enclosures J M TEIRE 14 June 1972 [15 Feb 1972] 6952/72 Headings H4J and H4X A loud-speaker enclosure comprises a hollow shell of ceramic material having at least one sound transmissive aperture adjacent which is a support, within the shell, for a loud-speaker. The loud-speaker diaphragm separates the at least one aperture from a major portion of the space within the shell. The ceramic material is preferably clay-based to provide high mass, and it may be glazed. Upper and lower parts of the shell may have the same or different decorative effects. For multi-channel sound reproduction all enclosures of a set may be similar or glazed differently. A ceramic enclosure 2 (Fig. 1) has the form of a truncated ovoid member 4 supported on a drum-like base 3. A horizontal shelf 5, centrally apertured, has holes 7 by which a loud-speaker 1 is secured. The loud-speaker 1 may be mounted on a wooden frame secured to the shelf 5, a resilient gasket being interposed. An aperture in the base of member 4 is large enough for insertion of the loud-speaker 1. Sound transmissive apertures 8 are provided above the shelf 5. A loud-speaker lead 9 passes through a hole 10 in base 3. Sound absorbent material 21 fills the enclosure 2. The base 3 has a flange 11 which fits within a recess in the lower part of member 4. Bolts (16), Fig. 2, not shown, secured by nuts (17) pass through aligned holes (14, 15) in the base 3 and member 4 to provide rigid connection. The nuts and bolts may be of nvlon. If they are of metal, soft resilient washers (18, 19) are placed between them and the ceramic material. A felt or other resilient gasket (20) is interposed between base 3 and member 4. Alternatively, base 3 and member 4 are secured by adhesive. In an alternative embodiment (Fig. 3, not shown) the base 3 and ovoid member 4 are integral up to and including a loud-speaker shelf (32) centrally apertured to accept a loud-speaker 1 mounted on a supporting board (34). The interior of the ovoid member has rounded-off edges. A horizontal spider (38) of radially extending arms strengthens the enclosure. Above the loud-speaker (1) is a cap (35) secured by rupturable adhesive to the shelf (32)- Preferably an annular projection in the underside of the cap (35) fits into a circular recess (36) in the upper part of the shelf (32). The cap (35) is apertured to provide sound radiation. Yet another embodiment uses two loudspeakers 41, 42 (Fig. 4). A lower portion 43 of the enclosure extends upwardly to a shelf for supporting loud-speaker 41. Loud-speaker 42 is supported on a radially inwardly extending flange 43a. A drum-like base 44 extends between flange 43a and a bottom wall 43b and has sloping apertures 45 which, together with a sound reflector cone 50 (e.g. of exponential form) assist in deflecting sound radially rather than axially. A cap 47 which is secured similarly to that of Fig. 3, has shaped apertures 48 to deflect sound from loud-speaker 41 radially outwardly. In an alternative arrangement (not shown) loud-speaker 41 is mounted on cap 47. Loud-speaker 41 may reproduce high frequencies while loud-speaker 42 reproduces lower frequencies or the frequency ranges of the two loud-speakers may be alike. A reflector cone, similar to cone 50, may be provided for loudspeaker 41. A small aperture 51 provides equalization of slow changes of atmospheric pressure.
GB1350051D 1972-02-15 1972-02-15 Enclosure for loudspeakers Expired GB1350051A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB695272 1972-02-15

Publications (1)

Publication Number Publication Date
GB1350051A true GB1350051A (en) 1974-04-18

Family

ID=9823852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1350051D Expired GB1350051A (en) 1972-02-15 1972-02-15 Enclosure for loudspeakers

Country Status (1)

Country Link
GB (1) GB1350051A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665550A (en) * 1984-02-17 1987-05-12 Haas Rainer J Electrodynamic loudspeaker having omnidirectional sound emission

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665550A (en) * 1984-02-17 1987-05-12 Haas Rainer J Electrodynamic loudspeaker having omnidirectional sound emission

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee