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JJG 449-2014: Verification Regulation of Octave-Band and Fractional-Octave-Band Filters
Status: Valid JJG 449: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 449-2014 | English | 669 |
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5 days [Need to translate]
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Verification Regulation of Octave-Band and Fractional-Octave-Band Filters
| Valid |
JJG 449-2014
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| JJG 449-2001 | English | RFQ |
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9 days [Need to translate]
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Verification Regulation of Octave-Band and One-Third-Octave Band Filters
| Obsolete |
JJG 449-2001
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| JJG 449-1986 | English | RFQ |
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3 days [Need to translate]
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Verification Regulation of Octave-band and One-third-octave-band Filters
| Obsolete |
JJG 449-1986
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PDF similar to JJG 449-2014
Basic data | Standard ID | JJG 449-2014 (JJG449-2014) | | Description (Translated English) | Verification Regulation of Octave-Band and Fractional-Octave-Band Filters | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A56 | | Word Count Estimation | 29,214 | | Date of Issue | 8/25/2014 | | Date of Implementation | 2/25/2015 | | Older Standard (superseded by this standard) | JJG 449-2001 | | Quoted Standard | JJF 1001-2011; JJF 1034-2005; GB 3102.5; GB 3102.7; GB/T 3241-2010 | | Adopted Standard | IEC 61260-1, NEQ; IEC 61260-3, NEQ; OIML R130-2001(E), NEQ | | Regulation (derived from) | People's Republic of China The State Administration of Quality Supervision, Inspection and Quarantine Notice 2014 (No. 95); AQSIQ Notice 2014 No. 95 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | | Summary | This Standard applies within the audible frequency range of 1 and 2 octave filters and fractional octave filters initial verification, use and subsequent verification check. | JJG 449-2014: Verification Regulation of Octave-Band and Fractional-Octave-Band Filters---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
introduction
The procedure according to the rules JJF1002-2010 "national verification procedures to write rules" given the preparation, and
"Evaluation and Expression of Uncertainty in Measurement" in accordance with the requirements of JJF1059.1-2012 assessment and expressed measurement uncertainty.
This procedure reference international standards IEC 61260-1 "electrical acoustic octave and fractional octave filters first
Part 1. Specification "(Electroacoustics-Octave-bandandfractional-octave-bandfilters-Part
1. Specifications) ①, IEC 61260-3 "electrical acoustic octave and fractional octave filters - Part 3.
Cycle test "(Electroacoustics-Octave-bandandfractional-octave-bandfilters-Part 3.
Periodictests) ② and international recommendations OIMLR1302001 (E) version of "octave and 1/3 octave filters"
The procedures in place JJG 449-2001 "octave and 1/3 octave filters." And JJG 449-2001 phase
Ratio, the main technical changes are as follows.
--- Increasing the content of other fractional octave filters other than 1/3 (see Chapter 1, Appendix A and Appendix
B);
--- Remove the filter in relation to 0 (see 2001 edition of Chapters 1 and 5);
--- Delete the contents of the relevant appraisement and prototype testing (see the 2001 edition of Chapter 1, 7.3 and Annex C);
--- Remove the filter bandwidth of 10 terms and definitions, additional definitions of the band-pass filter 5 terms
(See Chapter 3, Section 3 of the 2001 edition);
--- Increased in relation to the center frequency relative attenuation (see 5.1 and 7.3.2);
--- Modify the relative attenuation limit (see Table 2, 2001 edition of the Table 2);
--- Modified linear level requirements (see 53, 2001 version 5.4.);
--- Removed and the contents of the relevant output signal (see 2001 edition 5.7 and 7.2.2.5);
--- Deleted the contents of the flat frequency response (see 2001 edition 5.8 and 7.2.2.6);
--- Modify the test project and use of inspection items (see 711, 2001 edition 7.1.);
--- Revised standards on the measurement and the main equipment requirements (see the edition of 7.2.1,2001
7.2.1.1);
--- Modify the verification of environmental conditions (see 722, 2001 edition of 7.2.1.2..);
--- Increasing the uncertainty of measurement requirements (see 7.2.4);
--- Revised test methods relative attenuation (see 733, 2001 edition of 7.2.2.3..);
--- Revised test method-level linearity error (see 734, 2001 edition of 7.2.2.4..);
--- Modify the use of inspection methods (see 7.6 2, 2001 edition of 7.4.3).
The previous versions of the release JJG 449 case.
--- JJG 449-2001;
--- JJG 449-1986.
① The document is still in FDIS stage.
② The file is still in the CD stage.
Octave and fractional octave filters test procedures
1 Scope
This procedure is applied within the audible frequency range of the Level 1 and Level 2 octave filters and fractional octave filters first seizure
Set, and use the subsequent verification check.
2. References
This procedure references the following documents.
JJF1001-2011 common measurement terms and definitions
JJF1034-2005 acoustic measurement terminology and definitions
GB 3102.5 Quantities and units of electricity and magnetism
GB 3102.7 Quantities and units of acoustics
GB/T 3241-2010 electro-acoustics octave and fractional octave filters
For dated references, only the dated edition applies to this procedure; undated reference documents
Member, the latest edition (including any amendments) applies to this procedure.
3 terminology and units of measurement
3.1 Terms and Definitions
JJF1001-2011, JJF1034-2005 and JJF1059.1-2012 defined and following terms and definitions applicable
Used in this procedure.
3.1.1 bandpass filter bandpassfilter
Has a single transmission band (or with a small relative attenuation passband) filters, which is greater than the transmission band from
Lower frequency zero extends to the upper frequency limited. [GB/T 3241-2010, Definition 3.1]
3.1.2 octave frequency than octavefrequencyratio
The nominal value of one octave or 2.1 frequency ratio.
3.1.3 Bandwidth indicated value bandwidthdesignator
Score for indicating octave bandwidth, including a positive integer including reciprocal.
NOTE. the bandwidth indication for indicating a set value of a nominal bandwidth of each filter in the filter, e.g., 1/b = 1/12, description of these filter
It is 1/12 octave band-pass filter.
3.1.4 reference frequency referencefrequency
For normalized single-frequency attenuation of all filters in the filter bank response.
Note. In this procedure, the reference frequency is set to 1kHz.
3.1.5 accurate [band] center frequency exactmidbandfrequency
Relationship with the provisions of the reference frequency, so that at a predetermined bandwidth filter banks, any two adjacent band-pass filter
The exact same frequency than the center frequency of the filter.
3.1.6 Nominal [band] center frequency nominalmidbandfrequency
Logo for the bandpass filter center frequency and rounding. [GB/T 3241-2010, the definition 3.6]
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