• AS/NZS 4476:1997

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    Acoustics - Octave-band and fractional-octave-band-filters

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  02-05-2019

    Language(s):  English

    Published date:  05-07-1997

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS/NZS 4476:1997 ACOUSTICS-OCTAVE-BAND AND FRACTIONAL-OCTAVE-BAND FILTERS
    4 - PREFACE
    6 - CONTENTS
    7 - 1 Scope
    7 - 2 Normative references
    8 - 3 Definitions
    8 - 3.1 bandpass filter:
    8 - 3.2 octave ratio:
    8 - 3.3 bandwidth designator:
    8 - 3.4 reference frequency:
    8 - 3.5 exact midband frequency:
    9 - 3.6 nominal midband frequencies:
    9 - 3.7 bandedge frequencies:
    9 - 3.8 normalized frequency:
    9 - 3.9 filter bandwidth:
    9 - 3.10 octave-band filter:
    10 - 3.11 fractional-octave-band filter:
    10 - 3.12 filter attenuation:
    10 - 3.13 reference attenuation:
    10 - 3.14 relative attenuation:
    10 - 3.15 normalized effective bandwidth:
    11 - 3.16 normalized reference bandwidth:
    11 - 3.17 filter integrated response:
    11 - 3.18 reference level range:
    11 - 3.19 reference input signal level:
    11 - 3.20 level difference:
    11 - 3.21 reference level difference:
    11 - 3.22 level linearity error:
    11 - 3.23 linear operating range:
    11 - 3.24 level range control:
    11 - 3.25 measurement range:
    11 - 3.26 analogue filter:
    12 - 3.27 sampled-data filter:
    12 - 3.28 digital filter:
    12 - 3.29 real-time operation:
    12 - 3.30 aliased frequency components:
    12 - 3.31 anti-alias filter:
    12 - 4 Performance requirements
    12 - 4.1 General
    12 - 4.2 Nominal midband frequencies
    12 - 4.3 Reference attenuation
    13 - 4.4 Relative attenuation
    15 - 4.5 Filter integrated response
    16 - 4.6 Linear operating range
    16 - 4.7 Real-time operation
    16 - 4.8 Anti-alias filters
    16 - 4.9 Summation of output signals
    17 - 4.10 Flat frequency response
    17 - 4.11 Maximum input signal
    17 - 4.12 Terminating impedances
    17 - 4.13 Reference environmental conditions
    17 - 4.14 Sensitivity to various environments
    17 - 4.14.1 Ambient air temperature
    17 - 4.14.2 Relative humidity
    17 - 4.14.3 Alternating magnetic fields
    18 - 4.14.4 Electrostatic discharges
    18 - 4.14.5 Radio-frequency electromagnetic fields
    18 - 4.15 Power supply check
    18 - 5 Test methods
    18 - 5.1 General
    18 - 5.2 Test instruments
    19 - 5.3 Relative attenuation
    20 - 5.4 Filter integrated response
    20 - 5.5 Linear operating range
    21 - 5.6 Real-time operation
    22 - 5.7 Anti-alias filters
    22 - 5.8 Summation of output signals
    23 - 5.9 Flat frequency response
    23 - 5.10 Sensitivity to variations of the environment
    23 - 5.11 Sensitivity to electrostatic discharge
    24 - 5.12 Sensitivity to radio-frequency electromagnetic fields
    24 - 6 Instrument marking
    24 - 7 Instruction manual
    26 - Annex A - Midband frequencies
    28 - Annex B - Normalized frequencies at breakpoints of limits on minimum and maximum relative attenuation for...
    30 - Annex C - Recommendations for verification of the electrical performance characteristics of bandpass filters

    Abstract - (Show below) - (Hide below)

    Specifies performance requirements and methods for testing the performance of analogue, sampled-data and digital implementations of band-pass filters that comprise a filter set or spectrum analyser. Performance requirements are provided for three filter classes. It is identical with and has been reproduced from IEC 1260:1995.

    Scope - (Show below) - (Hide below)

    This International Standard provides performance requirements and methods for testing the performance of analogue, sampled-data, and digital implementations of band-pass filters that comprise a filter set or spectrum analyser. The extent of the passband region of a filter's relative attenuation characteristic is a constant percentage of the midband frequency for all filters of a given bandwidth. An instrument complying with the requirements of this International Standard may contain any number of bandpass filters covering any desired frequency range.Performance requirements are provided for three filter classes designated class 0, class 1, and class 2. Allowed tolerances increase as the class number increases.Bandpass filters complying with the performance requirements of this standard may be part of various measurement systems or may be an integral component of a specific instrument and shall operate in real time. Performance requirements apply to any method that is selected by the manufacturer to implement the design of the filters.Instruments complying with the requirements of this standard are capable of providing frequency-band-filtered spectral information for a wide variety of signals, for example, time-varying, intermittent, and steady; broadband and discrete frequency; and long and short durations. For applications involving transient signals, different realizations of filters meeting the requirements of this standard may give different results.

    General Product Information - (Show below) - (Hide below)

    Committee AV-002
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes
    Under Revision

    History - (Show below) - (Hide below)

    First published in Australia as AS Z41-1969.Withdrawn 1996.First published in New Zealand as NZS 1499:1965.AS Z41-1969 and NZS 1499:1965 jointly revised, amalgamated and redesignated AS/NZS 4476:1997. First published in Australia as AS Z41-1969. Withdrawn 1996. First published in New Zealand as NZS 1499:1965. AS Z41-1969 and NZS 1499:1965 jointly revised, amalgamated and redesignated AS/NZS 4476:1997.

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS 1259.2-1990 Acoustics - Sound level meters Integrating - Averaging
    AS 1259.1-1990 Acoustics - Sound level meters - Non-integrating
    AS 2533-1982 Acoustics - Preferred frequencies for measurements

    Standards Referencing This Book - (Show below) - (Hide below)

    AS/NZS 1269.1:2005 Occupational noise management Measurement and assessment of noise immission and exposure (Reconfirmed 2016)
    AS ISO 140.4-2006 Acoustics - Measurement of sound insulation in buildings and of building elements Field measurements of airborne sound insulation between rooms (ISO 140-4:1998, MOD)
    AS/NZS 1269.1:1998 Occupational noise management - Measurement and assessment of noise immission and exposure
    AS ISO 140.6-2006 Acoustics - Measurement of sound insulation in buildings and of building elements - Laboratory measurements of impact sound insulation of floors
    AS ISO 354-2006 Acoustics - Measurement of sound absorption in a reverberation room
    AS 1191-2002 Acoustics - Method for laboratory measurement of airborne sound transmission insulation of building elements
    AS ISO 140.8-2006 Acoustics - Measurement of sound insulation in buildings and of building elements Laboratory measurements of the reduction of transmitted impact noise by floor coverings on a heavyweight standard floor
    AS ISO 8253.2-2009 Acoustics - Audiometric test methods Sound field audiometry with pure tone and narrow-band test signals
    AS/NZS 1269.4:2005 Occupational noise management Auditory assessment
    AS/NZS 60065:2003 Audio, video and similar electronic apparatus - Safety requirements (IEC 60065:2001, MOD)
    AS 2913-2000 Evaporative airconditioning equipment
    AS/NZS 1270:2002 Acoustics - Hearing protectors
    AS/NZS 2499:2000 Acoustics - Measurements of sound insulation in buildings and of buildings elements - Laboratory measurement of room-to-room airborne sound insulation of a suspended ceiling with a plenum above it
    AS/NZS 60065:2012 Audio, video and similar electronic apparatus - Safety requirements (IEC 60065, Ed.7.2 (2011) MOD)
    AS/NZS 1270:1999 Acoustics - Hearing protectors
    AS 2533-2002 Acoustics - Preferred frequencies and band centre frequencies
    AS/NZS 60704.1:2009 Household and similar electrical appliances - Test code for the determination of airborne acoustical noise General requirements
    AS ISO 8253.1-2009 Acoustics - Audiometric test methods Basic pure tone air and bone conduction threshold audiometry
    AS/NZS 2460:2002 Acoustics - Measurement of the reverberation time in rooms
    AS/NZS 1269.4:2014 Occupational noise management Auditory assessment
    AS/NZS 1269.4:1998 Occupational noise management - Auditory assessment
    AS 2377-2002 Acoustics - Methods for the measurement of railbound vehicle noise
    AS 60118.2-2007 Hearing aids - Hearing aids with automatic gain control circuits
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