GB2110054B - Directional acoustic transducers - Google Patents

Directional acoustic transducers

Info

Publication number
GB2110054B
GB2110054B GB08232811A GB8232811A GB2110054B GB 2110054 B GB2110054 B GB 2110054B GB 08232811 A GB08232811 A GB 08232811A GB 8232811 A GB8232811 A GB 8232811A GB 2110054 B GB2110054 B GB 2110054B
Authority
GB
United Kingdom
Prior art keywords
acoustic transducers
directional acoustic
directional
transducers
acoustic
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
GB08232811A
Other versions
GB2110054A (en
Inventor
David Arthur Berkley
Ilene Joy Busch-Vishniac
Christopher Dion G Stockbridge
Robert Lee Wallace
James Edward West
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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
Priority claimed from US06/323,684 external-priority patent/US4434327A/en
Priority claimed from US06/323,667 external-priority patent/US4429189A/en
Priority claimed from US06/323,697 external-priority patent/US4429193A/en
Priority claimed from US06/323,668 external-priority patent/US4429190A/en
Priority claimed from US06/323,669 external-priority patent/US4429191A/en
Priority claimed from US06/323,696 external-priority patent/US4429192A/en
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB2110054A publication Critical patent/GB2110054A/en
Application granted granted Critical
Publication of GB2110054B publication Critical patent/GB2110054B/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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • 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
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/32—Sound-focusing or directing, e.g. scanning characterised by the shape of the source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/01—Electrostatic transducers characterised by the use of electrets
GB08232811A 1981-11-20 1982-11-17 Directional acoustic transducers Expired GB2110054B (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US06/323,684 US4434327A (en) 1981-11-20 1981-11-20 Electret transducer with variable actual air gap
US06/323,667 US4429189A (en) 1981-11-20 1981-11-20 Electret transducer with a selectively metalized backplate
US06/323,697 US4429193A (en) 1981-11-20 1981-11-20 Electret transducer with variable effective air gap
US06/323,668 US4429190A (en) 1981-11-20 1981-11-20 Continuous strip electret transducer array
US06/323,669 US4429191A (en) 1981-11-20 1981-11-20 Electret transducer with variably charged electret foil
US06/323,696 US4429192A (en) 1981-11-20 1981-11-20 Electret transducer with variable electret foil thickness

Publications (2)

Publication Number Publication Date
GB2110054A GB2110054A (en) 1983-06-08
GB2110054B true GB2110054B (en) 1985-09-25

Family

ID=27559720

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08232811A Expired GB2110054B (en) 1981-11-20 1982-11-17 Directional acoustic transducers

Country Status (1)

Country Link
GB (1) GB2110054B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK155269C (en) * 1986-07-17 1989-07-24 Brueel & Kjaer As Pressure gradient

Also Published As

Publication number Publication date
GB2110054A (en) 1983-06-08

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20021116