FR2371846A1 - Reflective acoustic wall member - enables reflected sound waves to enhance incident sound waves while absorbing undesirable reflections in damping material - Google Patents

Reflective acoustic wall member - enables reflected sound waves to enhance incident sound waves while absorbing undesirable reflections in damping material

Info

Publication number
FR2371846A1
FR2371846A1 FR7628237A FR7628237A FR2371846A1 FR 2371846 A1 FR2371846 A1 FR 2371846A1 FR 7628237 A FR7628237 A FR 7628237A FR 7628237 A FR7628237 A FR 7628237A FR 2371846 A1 FR2371846 A1 FR 2371846A1
Authority
FR
France
Prior art keywords
sound waves
wall member
damping material
reflected sound
acoustic wall
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.)
Granted
Application number
FR7628237A
Other languages
French (fr)
Other versions
FR2371846B1 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7628237A priority Critical patent/FR2371846A1/en
Publication of FR2371846A1 publication Critical patent/FR2371846A1/en
Application granted granted Critical
Publication of FR2371846B1 publication Critical patent/FR2371846B1/fr
Granted 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 
    • H04R1/28—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

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Building Environments (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)

Abstract

An acoustic wall member is designed so that it reflects incident sound waves in a particular manner. The wall member is so designed that the reflected sound waves have a particularly enhancing effect upon those sound waves approaching the member. In a circular version the diametral cross section comprises an inwardly conical section (2) and a surrounding section (3). Unwanted reflected sound from section (3) is absorbed in acoustic damping material (4).
FR7628237A 1976-09-14 1976-09-14 Reflective acoustic wall member - enables reflected sound waves to enhance incident sound waves while absorbing undesirable reflections in damping material Granted FR2371846A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7628237A FR2371846A1 (en) 1976-09-14 1976-09-14 Reflective acoustic wall member - enables reflected sound waves to enhance incident sound waves while absorbing undesirable reflections in damping material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7628237A FR2371846A1 (en) 1976-09-14 1976-09-14 Reflective acoustic wall member - enables reflected sound waves to enhance incident sound waves while absorbing undesirable reflections in damping material

Publications (2)

Publication Number Publication Date
FR2371846A1 true FR2371846A1 (en) 1978-06-16
FR2371846B1 FR2371846B1 (en) 1980-12-12

Family

ID=9177854

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7628237A Granted FR2371846A1 (en) 1976-09-14 1976-09-14 Reflective acoustic wall member - enables reflected sound waves to enhance incident sound waves while absorbing undesirable reflections in damping material

Country Status (1)

Country Link
FR (1) FR2371846A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303144A (en) * 1979-12-21 1981-12-01 Lockheed Corporation Apparatus for the retroreflection of sound
US4356880A (en) * 1980-07-28 1982-11-02 Downs James W Acoustical reflectors
EP0280162A2 (en) * 1987-02-26 1988-08-31 EWD Electronic-Werke Deutschland GmbH Loudspeaker box with an airtight enclosure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR666804A (en) * 1928-04-28 1929-10-07 Improvements to sound reproduction devices, such as telephone loudspeakers
US1757938A (en) * 1925-04-13 1930-05-06 Harvey C Hayes Acoustic instrument
FR825516A (en) * 1937-08-12 1938-03-04 Sound reception device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757938A (en) * 1925-04-13 1930-05-06 Harvey C Hayes Acoustic instrument
FR666804A (en) * 1928-04-28 1929-10-07 Improvements to sound reproduction devices, such as telephone loudspeakers
FR825516A (en) * 1937-08-12 1938-03-04 Sound reception device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303144A (en) * 1979-12-21 1981-12-01 Lockheed Corporation Apparatus for the retroreflection of sound
US4356880A (en) * 1980-07-28 1982-11-02 Downs James W Acoustical reflectors
EP0280162A2 (en) * 1987-02-26 1988-08-31 EWD Electronic-Werke Deutschland GmbH Loudspeaker box with an airtight enclosure
EP0280162A3 (en) * 1987-02-26 1990-12-12 EWD Electronic-Werke Deutschland GmbH Loudspeaker box with an airtight enclosure

Also Published As

Publication number Publication date
FR2371846B1 (en) 1980-12-12

Similar Documents

Publication Publication Date Title
DE69013735D1 (en) Shock wave lithotripsy device that works with ultrasonic waves.
CA1035458A (en) Acoustic delay surface wave motion transducer systems with enhanced stability
FR2466139B1 (en) SURFACE ACOUSTIC WAVE REFLECTING DEVICE
FR2371846A1 (en) Reflective acoustic wall member - enables reflected sound waves to enhance incident sound waves while absorbing undesirable reflections in damping material
JPS54128187A (en) Ultrasonic wave reflection device
DE69106933D1 (en) Fixed echo suppression device for an ultrasound echograph.
JPS53109457A (en) Element for elastic surface wave propagation
NO153785C (en) DEVICE FOR DETERMINING THE TIME OF RECEIPT FOR AN ACOUSTIC IMPULSE IN A TRANSDUCER.
JPS5532502A (en) Ultrasonic wave reflection device
JPS5526975A (en) Ultrasonic wave reflection device
NL7513440A (en) SOUND AND ELECTROMAGNETIC WAVES ABSORPTION DEVICE AND METHOD OF MANUFACTURE THEREOF.
JPS52112928A (en) Device for detecting obstacle for automobile
DE3889066D1 (en) Surface acoustic wave device with three transducers and with one or two apodized transducers with minimum phase and maximum phase pulse reproduction characteristics.
FR2377679A1 (en) Acoustic absorption and insulation modules - form acoustic screen using concave modules having sound insulating skin and absorbent material
FR2733620B1 (en) SOUND WAVE ABSORBING MATERIAL, ESPECIALLY IN UNDERWATER ACOUSTICS
JPS6440894A (en) New sound absorbing material
JPS52123652A (en) Identification apparatus for ultrasonic reflection waves and noise wav es
FR2490855B1 (en) QUIET CAPABLE OF ABSORBING SOUND WAVES
郑敏华 et al. A STUDY OF THE SOUND REFLECTION FROM POROUS MATERIAL BY IMPULSE METHOD
杨训仁 REFLECTION AND REFRACTION OF PLANE SOUND WAVES IN MOVING STRATIFIED MEDIA
JPS5529359A (en) Ultrasonic wave reflection device
JPS5298881A (en) Remote control device
ATE39543T1 (en) EXHAUST SYSTEM.
ROSTAFINSKI Acoustic systems containing curved duct sections(numerical analysis of wave propagation in acoustic ducts)
CA681325A (en) Flaw detection and like systems using pulsed sonic or ultrasonic waves

Legal Events

Date Code Title Description
ST Notification of lapse