GB2020807A - Apparatus for Measuring Acoustic Intensity - Google Patents

Apparatus for Measuring Acoustic Intensity

Info

Publication number
GB2020807A
GB2020807A GB7914423A GB7914423A GB2020807A GB 2020807 A GB2020807 A GB 2020807A GB 7914423 A GB7914423 A GB 7914423A GB 7914423 A GB7914423 A GB 7914423A GB 2020807 A GB2020807 A GB 2020807A
Authority
GB
United Kingdom
Prior art keywords
signals
acoustic intensity
measuring acoustic
fourier transforms
digital codes
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
GB7914423A
Other versions
GB2020807B (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.)
Centre Technique des Industries Mecaniques CETIM
Original Assignee
Centre Technique des Industries Mecaniques CETIM
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 Centre Technique des Industries Mecaniques CETIM filed Critical Centre Technique des Industries Mecaniques CETIM
Publication of GB2020807A publication Critical patent/GB2020807A/en
Application granted granted Critical
Publication of GB2020807B publication Critical patent/GB2020807B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/04—Frequency
    • G01H3/08—Analysing frequencies present in complex vibrations, e.g. comparing harmonics present

Abstract

Apparatus for measuring acoustic intensity (e.g. machine noise) comprises a pair of microphones 1, 2 coupled back to back, amplifiers 3, 4, low pass filters 5, means for analogue- digital conversion 6 to produce a series of digital codes representative of signals at successive different instants, and means 7 for automatic calculation, from these digital codes, of the Fourier transforms representing each of the signals, and of the acoustic intensities corresponding to each of the frequencies of the Fourier transforms of the two signals. <IMAGE>
GB7914423A 1978-05-10 1979-04-25 Apparatus for measuring acoustic intensity Expired GB2020807B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7813863A FR2425632A1 (en) 1978-05-10 1978-05-10 ACOUSTIC INTENSITY MEASURING DEVICE

Publications (2)

Publication Number Publication Date
GB2020807A true GB2020807A (en) 1979-11-21
GB2020807B GB2020807B (en) 1982-10-06

Family

ID=9208096

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7914423A Expired GB2020807B (en) 1978-05-10 1979-04-25 Apparatus for measuring acoustic intensity

Country Status (6)

Country Link
CH (1) CH631262A5 (en)
DE (1) DE2918947A1 (en)
DK (1) DK191979A (en)
FR (1) FR2425632A1 (en)
GB (1) GB2020807B (en)
NL (1) NL7903446A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127966A (en) * 1982-10-01 1984-04-18 Bridgestone Tire Co Ltd Method and apparatus for detecting sound source
GB2129560A (en) * 1982-10-29 1984-05-16 Asahi Chemical Ind Micro fracture detector
EP0113275A2 (en) * 1982-12-17 1984-07-11 Victor Company Of Japan, Limited Spectrum display device for audio signals
WO2006096959A1 (en) 2005-03-16 2006-09-21 James Cox Microphone array and digital signal processing system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127966A (en) * 1982-10-01 1984-04-18 Bridgestone Tire Co Ltd Method and apparatus for detecting sound source
GB2129560A (en) * 1982-10-29 1984-05-16 Asahi Chemical Ind Micro fracture detector
EP0113275A2 (en) * 1982-12-17 1984-07-11 Victor Company Of Japan, Limited Spectrum display device for audio signals
EP0113275A3 (en) * 1982-12-17 1986-03-26 Victor Company Of Japan, Limited Spectrum display device for audio signals
US4665494A (en) * 1982-12-17 1987-05-12 Victor Company Of Japan, Limited Spectrum display device for audio signals
WO2006096959A1 (en) 2005-03-16 2006-09-21 James Cox Microphone array and digital signal processing system
EP1867206A1 (en) * 2005-03-16 2007-12-19 James Cox Microphone array and digital signal processing system
EP1867206A4 (en) * 2005-03-16 2009-09-30 James Cox Microphone array and digital signal processing system
US8090117B2 (en) 2005-03-16 2012-01-03 James Cox Microphone array and digital signal processing system

Also Published As

Publication number Publication date
CH631262A5 (en) 1982-07-30
DE2918947A1 (en) 1979-11-22
NL7903446A (en) 1979-11-13
DK191979A (en) 1979-11-11
FR2425632A1 (en) 1979-12-07
GB2020807B (en) 1982-10-06
FR2425632B1 (en) 1981-07-17

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Legal Events

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