WO1990007103A1 - Sound reflection unit and audio loudspeaker unit comprising such a sound reflection unit - Google Patents

Sound reflection unit and audio loudspeaker unit comprising such a sound reflection unit Download PDF

Info

Publication number
WO1990007103A1
WO1990007103A1 PCT/GB1989/001499 GB8901499W WO9007103A1 WO 1990007103 A1 WO1990007103 A1 WO 1990007103A1 GB 8901499 W GB8901499 W GB 8901499W WO 9007103 A1 WO9007103 A1 WO 9007103A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
sound reflection
frequency range
range speaker
sound
Prior art date
Application number
PCT/GB1989/001499
Other languages
French (fr)
Inventor
Ralph William Oakley
Roger George Pearl
Original Assignee
Ralph William Oakley
Roger George Pearl
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 Ralph William Oakley, Roger George Pearl filed Critical Ralph William Oakley
Publication of WO1990007103A1 publication Critical patent/WO1990007103A1/en

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
    • H04R1/32—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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/20—Reflecting arrangements
    • 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
    • H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers

Definitions

  • Sound reflection unit and an audio loudspeaker unit comprising such a sound reflection unit
  • This invention relates to means for reflecting sounds produced in audio equipment in required directions.
  • a sound reflection unit comprising a body formed from a ceramic material and being circular or partcircular in plan view so as to define, in vertical cross-section, a parabolic surface extending in the one direction, and an angie ⁇ plane surface extending in the other direction.
  • the body will define a complete disc in plan view; this then produces omni- directional reflection of sound from a loudspeaker directed onto the unit which can create a much better effect to a listener and this is enhanced where a pair of units are employed to create stereo sound.
  • the body will define a part- circular portion merging into linear edge portions, in plan view.
  • the parts defining the two surfaces will be separately formed parts which have been secured together, back to back.
  • parabolic surface is ideally suited for the distribution of sound created by mid-frequency and low frequency range speakers, whilst the angled plane surface is better suited for the distribution of sound produced in the high frequency range of audio loudspeaker.
  • an audio loudspeaker unit comprising a sound reflection unit of this indention as hereinbefore defined, together with a high frequency range speaker whose output is directed towards the angled plane surface, and a mid-frequency range speaker whose output is directed towards the parabolic surface.
  • a low frequency range of speaker may be any low frequency range of speaker.
  • Figures 1 and 2 comprise a plan view and a side view (partly in cross-section) of one preferred form of the sound reflection unit of this invention
  • Figures 3 and 4 comprise plan and side views of an alternative form of a sound reflection unit of this invention.
  • Figure 5 is a diagrammatic illustration of a loudspeaker unit employing a sound reflector as illustrated in the earlier Figures.
  • the reflector shown in Figures 1 and 2 is circular in plan view and is formed from two separate parts, 1 and 2, as can be seen in Figure 2. Both parts are formed from firing a ceramic material. It will be noted that the upper part 1 defines an outer wall of parabolic form (as seen in cross-section) and has an enlarged rim 3 at the outer edge. This provides a recess for receipt of the rim of part 2 which is formed with an angled plane surface (in cross-section). After firing, the two parts are glued together to define the final sound
  • the unit of a desired form is incorporated into an audio louspeaker unit as shown in Figure 5.
  • the reflector is positioned with the part 2 facing upwardly towards a "tweeter” high frequency range speaker 6, whilst the part 1 is directed towards a mid-frequency range speaker 5.
  • a bass unit low frequency range speaker 7 is positioned in the base of the audio loudspeaker unit.
  • bass unit 7 If the bass unit 7 is to be omitted then the remaining parts 1,2,5 and 6 can be inverted.
  • the disc type sound reflection unit as shown in Figures 1 and 2 provides omni-directional sound
  • the ceramic material from which the sound reflection units are constructed provides a very true sound reflection.
  • the ceramic material used may include earthenware, stoneware, china, bone china, porcelain, sanitaryware and terra-cotta, fired at any conventional operating temperature.
  • the deflection surfaces may be glazed or unglazed.
  • the sound reflection unit shapes may be made by turning, slip casting, pressing, throwing or injection moulding in either solid or hollow form.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

An audio loudspeaker unit incorporates a reflector, formed from a fired ceramic material. This reflector has a part (1) which defines a parabolic wall and a part (2) having an angled plane surface. The reflector is positioned with part (2) facing upwardly towards a 'tweeter' high frequency range speaker (6), whilst the part (1) is directed towards a mid-frequency range speaker (5). A bass unit low frequency range speaker (7) is positioned in the base of the audio loudspeaker unit. If the bass unit (7) is to be omitted then the remaining parts (1, 2, 5 and 6) can be inverted. This disc type sound reflection unit provides omni-directional sound and the ceramic material provides a very true sound reflection.

Description

Sound reflection unit and an audio loudspeaker unit comprising such a sound reflection unit
This invention relates to means for reflecting sounds produced in audio equipment in required directions.
According to the present invention there is provided a sound reflection unit comprising a body formed from a ceramic material and being circular or partcircular in plan view so as to define, in vertical cross-section, a parabolic surface extending in the one direction, and an angieα plane surface extending in the other direction.
In a preferred arrangement the body will define a complete disc in plan view; this then produces omni- directional reflection of sound from a loudspeaker directed onto the unit which can create a much better effect to a listener and this is enhanced where a pair of units are employed to create stereo sound.
For certain purposes it may be desirable to direct the sound over an arc rather than over a complete circle. In this case the body will define a part- circular portion merging into linear edge portions, in plan view. For ease of manufacture the parts defining the two surfaces will be separately formed parts which have been secured together, back to back.
The purpose of having two differently shaped surfaces for the body is that the parabolic surface is ideally suited for the distribution of sound created by mid-frequency and low frequency range speakers, whilst the angled plane surface is better suited for the distribution of sound produced in the high frequency range of audio loudspeaker.
According to a further aspect of the invention there is provided an audio loudspeaker unit comprising a sound reflection unit of this indention as hereinbefore defined, together with a high frequency range speaker whose output is directed towards the angled plane surface, and a mid-frequency range speaker whose output is directed towards the parabolic surface.
A low frequency range of speaker may be
additionally positioned within the loudspeaker unit sc as to have its output also directed towards the angled plane surface.
The invention may be performed in various ways and preferred embodiments thereof will now be described with reference to the accompanying drawings, in which:
Figures 1 and 2 comprise a plan view and a side view (partly in cross-section) of one preferred form of the sound reflection unit of this invention,
Figures 3 and 4 comprise plan and side views of an alternative form of a sound reflection unit of this invention, and
Figure 5 is a diagrammatic illustration of a loudspeaker unit employing a sound reflector as illustrated in the earlier Figures.
The reflector shown in Figures 1 and 2 is circular in plan view and is formed from two separate parts, 1 and 2, as can be seen in Figure 2. Both parts are formed from firing a ceramic material. It will be noted that the upper part 1 defines an outer wall of parabolic form (as seen in cross-section) and has an enlarged rim 3 at the outer edge. This provides a recess for receipt of the rim of part 2 which is formed with an angled plane surface (in cross-section). After firing, the two parts are glued together to define the final sound
reflector unit.
A modified form of reflector is shown in Figures
3 and 4. In this instance the circular portion (in plan view) extends through only 180° and the unit then continues with linear edge portions 4. This type of unit is more suited for reflecting sounds in a preferential direction as there are no reflecting surfaces formed to the rear of the unit.
The unit of a desired form .is incorporated into an audio louspeaker unit as shown in Figure 5. Here the reflector is positioned with the part 2 facing upwardly towards a "tweeter" high frequency range speaker 6, whilst the part 1 is directed towards a mid-frequency range speaker 5. A bass unit low frequency range speaker 7 is positioned in the base of the audio loudspeaker unit.
If the bass unit 7 is to be omitted then the remaining parts 1,2,5 and 6 can be inverted.
The disc type sound reflection unit as shown in Figures 1 and 2 provides omni-directional sound
reflection whilst the part disc shown in Figures 3 and 4 provides partial omni-directional sound reflection and a much greater sound field perception as comtiared with conventional shot sound, which is distributed over 60º from the centre of each loudspeaker cone. Public address systems are particularly suited for the provision of cmni-directional sound which will give far greater clarity in coverage and minimise the in-line or behindspeaker effect experienced with conventional sound distributors.
The ceramic material from which the sound reflection units are constructed provides a very true sound reflection. The ceramic material used may include earthenware, stoneware, china, bone china, porcelain, sanitaryware and terra-cotta, fired at any conventional operating temperature. The deflection surfaces may be glazed or unglazed.
The sound reflection unit shapes may be made by turning, slip casting, pressing, throwing or injection moulding in either solid or hollow form.

Claims

1. A sound reflection urϊit Comprising a body
formed from a ceramic material and being circular or part-circular in plan view so as to define, in vertical cross-section, a parabolic surface extending in the one direction, and an angled plane surface extending in the other direction.
2. A unit according to claim 1, wherein the body defines a complete disc in plan view.
3. A unit according to claim 1, wherein the body defines a part-circular portion merging into linear edge portions, in plan view.
4. A unit according to any one of claims 1 to 3, wherein the parts defining the two surfaces are separately formed parts which have been secured together, back to back.
5. An audio loudspeaker unit comprising a sound reflection unit as claimed in any one of claims 1 to 4, together with a high frequency range speaker whose output is directed towards the angled plane surface, and a mid- frequency range speaker whose output is directed towards the parabolic surface.
6. A loudspeaker unit according to claim 5 , wherein a low frequency range speaker is additionally positioned within the loudspeaker unit so as to have its output also directed towards the angled surface.
7. A sound reflection unit or an audio loudspeaker unit substantially as herein described with reference to the accompanying drawings.
PCT/GB1989/001499 1988-12-14 1989-12-14 Sound reflection unit and audio loudspeaker unit comprising such a sound reflection unit WO1990007103A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888829125A GB8829125D0 (en) 1988-12-14 1988-12-14 Improvements relating to sound reflection devices
GB8829125.7 1988-12-14

Publications (1)

Publication Number Publication Date
WO1990007103A1 true WO1990007103A1 (en) 1990-06-28

Family

ID=10648445

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/001499 WO1990007103A1 (en) 1988-12-14 1989-12-14 Sound reflection unit and audio loudspeaker unit comprising such a sound reflection unit

Country Status (5)

Country Link
EP (1) EP0400133A1 (en)
JP (1) JPH03505034A (en)
AU (1) AU4746390A (en)
GB (1) GB8829125D0 (en)
WO (1) WO1990007103A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0677979A1 (en) * 1994-04-13 1995-10-18 Albert Baur Loudspeaker enclosure
DE19527499C1 (en) * 1995-07-27 1996-07-25 Rudolf Mechow Loudspeaker with conical reflector having median point of inflection e.g. for stereo audio equipment
WO1998009273A1 (en) * 1996-08-30 1998-03-05 Mediaphile Av Technologies, Inc. Cone reflector/coupler speaker system and method
US6064744A (en) * 1997-04-18 2000-05-16 Augustin; Heinz-Juergen Omni-directional loudspeaker
WO2003088707A1 (en) * 2002-04-16 2003-10-23 Ipg Patentverwertungs- Gesellschaft Ag Loudspeaker assembly comprising loudspeakers that are arranged one above the other on a perpendicular axis
DE10222006A1 (en) * 2002-05-17 2003-12-04 Thomas Wolff Loudspeaker system for reproducing sonic experiences true to nature has two separate systems each with an identical structure to include high-, mid- and low-range sound devices
GB2399473A (en) * 2003-03-13 2004-09-15 Feuvre Nicholas Paul Le Loudspeaker with low distortion precise imaging and deep bass
DE202012000148U1 (en) 2012-01-07 2012-03-06 Jens Burmeister Speaker arrangement with woofer and bass reflex tube
DE102011016326A1 (en) * 2011-04-01 2012-10-04 Kerstin Brachaus Loudspeaker arrangement has tip ends of cone-shaped portions that are directed towards corresponding speaker unit, and surfaces of cone-shaped portions that are enlarged by recess portions and projections
GB2573056A (en) * 2018-04-19 2019-10-23 Tymphany Acoustic Tech Huizhou Co Ltd Speaker and sound diffuser thereof
EP3611934A1 (en) * 2018-08-15 2020-02-19 Tymphany HK Limited Portable audio system with acoustic waveguide

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10341761B2 (en) 2017-02-17 2019-07-02 Tymphany Hk Limited Acoustic waveguide for audio speaker

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2007461A (en) * 1977-09-06 1979-05-16 Selmin Sas Method and devices for the omnidirectional radiation of sound waves
US4348750A (en) * 1979-08-06 1982-09-07 Schwind David R Energy control device
US4588042A (en) * 1984-07-23 1986-05-13 Palet Timothy J Parabolic speaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2007461A (en) * 1977-09-06 1979-05-16 Selmin Sas Method and devices for the omnidirectional radiation of sound waves
US4348750A (en) * 1979-08-06 1982-09-07 Schwind David R Energy control device
US4588042A (en) * 1984-07-23 1986-05-13 Palet Timothy J Parabolic speaker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Vol 10, No 192, E417, abstract of JP 61- 35699, publ 1986-02-02 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0677979A1 (en) * 1994-04-13 1995-10-18 Albert Baur Loudspeaker enclosure
DE19527499C1 (en) * 1995-07-27 1996-07-25 Rudolf Mechow Loudspeaker with conical reflector having median point of inflection e.g. for stereo audio equipment
WO1998009273A1 (en) * 1996-08-30 1998-03-05 Mediaphile Av Technologies, Inc. Cone reflector/coupler speaker system and method
US6257365B1 (en) 1996-08-30 2001-07-10 Mediaphile Av Technologies, Inc. Cone reflector/coupler speaker system and method
US6064744A (en) * 1997-04-18 2000-05-16 Augustin; Heinz-Juergen Omni-directional loudspeaker
DE19716315C2 (en) * 1997-04-18 2002-06-13 Heinz Juergen Augustin Omnidirectional loudspeaker system
WO2003088707A1 (en) * 2002-04-16 2003-10-23 Ipg Patentverwertungs- Gesellschaft Ag Loudspeaker assembly comprising loudspeakers that are arranged one above the other on a perpendicular axis
DE10222006B4 (en) * 2002-05-17 2004-05-27 Thomas Wolff Speaker layout
DE10222006A1 (en) * 2002-05-17 2003-12-04 Thomas Wolff Loudspeaker system for reproducing sonic experiences true to nature has two separate systems each with an identical structure to include high-, mid- and low-range sound devices
GB2399473A (en) * 2003-03-13 2004-09-15 Feuvre Nicholas Paul Le Loudspeaker with low distortion precise imaging and deep bass
GB2399473B (en) * 2003-03-13 2005-10-19 Feuvre Nicholas Paul Le Loudspeaker with low distortion precise imaging and deep bass
DE102011016326A1 (en) * 2011-04-01 2012-10-04 Kerstin Brachaus Loudspeaker arrangement has tip ends of cone-shaped portions that are directed towards corresponding speaker unit, and surfaces of cone-shaped portions that are enlarged by recess portions and projections
DE102011016326B4 (en) * 2011-04-01 2016-12-15 Kerstin Brachaus-Mechow Speaker layout
DE202012000148U1 (en) 2012-01-07 2012-03-06 Jens Burmeister Speaker arrangement with woofer and bass reflex tube
GB2573056A (en) * 2018-04-19 2019-10-23 Tymphany Acoustic Tech Huizhou Co Ltd Speaker and sound diffuser thereof
CN110392323A (en) * 2018-04-19 2019-10-29 惠州迪芬尼声学科技股份有限公司 Loudspeaker and its acoustic diffusers
GB2573056B (en) * 2018-04-19 2020-09-23 Tymphany Acoustic Tech Huizhou Co Ltd Speaker and sound diffuser thereof
EP3611934A1 (en) * 2018-08-15 2020-02-19 Tymphany HK Limited Portable audio system with acoustic waveguide

Also Published As

Publication number Publication date
EP0400133A1 (en) 1990-12-05
GB8829125D0 (en) 1989-01-25
AU4746390A (en) 1990-07-10
JPH03505034A (en) 1991-10-31

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