GB1163193A - Improvements in or relating to Apparatus for Automatically Computing Acoustic Noise Level - Google Patents

Improvements in or relating to Apparatus for Automatically Computing Acoustic Noise Level

Info

Publication number
GB1163193A
GB1163193A GB307167A GB307167A GB1163193A GB 1163193 A GB1163193 A GB 1163193A GB 307167 A GB307167 A GB 307167A GB 307167 A GB307167 A GB 307167A GB 1163193 A GB1163193 A GB 1163193A
Authority
GB
United Kingdom
Prior art keywords
fraction
units
outputs
noise
jan
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
GB307167A
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.)
Sentralinstitutt for Industriell Forskning
Original Assignee
Sentralinstitutt for Industriell Forskning
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 Sentralinstitutt for Industriell Forskning filed Critical Sentralinstitutt for Industriell Forskning
Publication of GB1163193A publication Critical patent/GB1163193A/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

Abstract

1,163,193. Measuring noise levels. NORWAY, CENTRAL INSTITUTE FOR INDUSTRIAL RESEARCH. 20 Jan., 1967 [22 Jan., 1966], No. 3071/67. Heading H4D. In an apparatus for automatically indicating noise level in desired units, e.g. Phons, Loudness Index or PNdB (perceived noise), noise signals from a microphone are applied to a bank of octave filters 2 having contiguous pass bands, the R.M.S. values of the filter output voltages are determined by circuits 3 and modified by function generators 4 producing outputs which are not-linear functions of their inputs, the function generator outputs are multiplied by a fixed fraction (e.g. 0.3) in units 6, the largest signal from the function generators is selected by unit 5 and multiplied at 7 by a second fraction which is unity minus the first fraction, and the outputs from units 6 and 7 are passed to a summing amplifier 8 whose output may be connected to a recorder 10 through a further non-linear function generator 9. An amplitude compressor may be included in each R.M.S. value determining circuit 3, so that the apparatus can cover a 50 dB dynamic range.
GB307167A 1966-01-22 1967-01-20 Improvements in or relating to Apparatus for Automatically Computing Acoustic Noise Level Expired GB1163193A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO16137566A NO117328B (en) 1966-01-22 1966-01-22

Publications (1)

Publication Number Publication Date
GB1163193A true GB1163193A (en) 1969-09-04

Family

ID=19909420

Family Applications (1)

Application Number Title Priority Date Filing Date
GB307167A Expired GB1163193A (en) 1966-01-22 1967-01-20 Improvements in or relating to Apparatus for Automatically Computing Acoustic Noise Level

Country Status (3)

Country Link
DE (1) DE1547074A1 (en)
GB (1) GB1163193A (en)
NO (1) NO117328B (en)

Also Published As

Publication number Publication date
DE1547074A1 (en) 1969-11-06
NO117328B (en) 1969-07-28

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees