GB2020807A - Apparatus for Measuring Acoustic Intensity - Google Patents
Apparatus for Measuring Acoustic IntensityInfo
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Circuit For Audible Band Transducer (AREA)
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>
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)
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 |
-
1978
- 1978-05-10 FR FR7813863A patent/FR2425632A1/en active Granted
-
1979
- 1979-04-25 GB GB7914423A patent/GB2020807B/en not_active Expired
- 1979-05-02 NL NL7903446A patent/NL7903446A/en not_active Application Discontinuation
- 1979-05-04 CH CH421779A patent/CH631262A5/en not_active IP Right Cessation
- 1979-05-09 DK DK191979A patent/DK191979A/en not_active Application Discontinuation
- 1979-05-10 DE DE19792918947 patent/DE2918947A1/en not_active Withdrawn
Cited By (9)
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 |
---|---|
DE2918947A1 (en) | 1979-11-22 |
DK191979A (en) | 1979-11-11 |
FR2425632A1 (en) | 1979-12-07 |
NL7903446A (en) | 1979-11-13 |
FR2425632B1 (en) | 1981-07-17 |
GB2020807B (en) | 1982-10-06 |
CH631262A5 (en) | 1982-07-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB2044996B (en) | Solid stage photo-electric converting device for solid state imaging apparatus | |
GB2010482B (en) | Acoustic imaging apparatus | |
FR2407628A1 (en) | SIGNAL TRANSMISSION CIRCUIT | |
DE2861715D1 (en) | Apparatus for ultrasonic imaging using dynamic focussing | |
DE3169659D1 (en) | Non-destructive inspection by frequency spectrum resolution | |
JPS53130085A (en) | Photometric device | |
GB2016858A (en) | Bvideo signal scanning standards conversion apparatus | |
JPS5428520A (en) | Method and apparatus for sampling frequency conversion | |
EP0080712A3 (en) | Sampling frequency converting apparatus | |
ZA781125B (en) | Process for removing unfilterable solids from an oil | |
ATE23768T1 (en) | METHOD AND APPARATUS FOR IMAGING A TEMPLATE ON AN OUTPUT MEDIA. | |
GB2020807A (en) | Apparatus for Measuring Acoustic Intensity | |
NO154326C (en) | PROCEDURE AND APPARATUS FOR USING AFFECTING AND SENDING Acoustic SIGNALS. | |
JPS5574467A (en) | Method of eliminating noise from known frequency | |
GB2026279B (en) | Eliminating fixes pattern noise signals from video output | |
FR2385260A1 (en) | DEVICE FOR FILTERING AN AMPLITUDE LIMIT SIGNAL | |
GB1547625A (en) | Equipment and method for removing an unwanted periodic noise signal from electric signals obtained through a measuring operation | |
JPS5338401A (en) | Method of removing distortion for photooelectric conversion of image signal | |
GB2003690A (en) | Digital processing | |
JPS56157868A (en) | Signal processor | |
SU682518A1 (en) | Process for the preparation of phthalic anhydride | |
JPS5596754A (en) | Digital frequency detection system | |
NO151802C (en) | Apparatus for generating a noise signal | |
JPS53106590A (en) | Photoelectric converter | |
ES402034A1 (en) | Apparatus to accelerate language learning. (Machine-translation by Google Translate, not legally binding) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |