JJG 994-2004 English PDF

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JJG 994-2004: Verification Regulation of Digital Audio Generators
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Basic data

Standard ID: JJG 994-2004 (JJG994-2004)
Description (Translated English): Verification Regulation of Digital Audio Generators
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Classification of International Standard: 17.140.01
Word Count Estimation: 18,154
Date of Issue: 2004-09-21
Date of Implementation: 2004-12-21
Quoted Standard: SJ/T 11180-1998; IEC 60958-1-1999; IEC 61606-1-2002
Regulation (derived from): 2004 technical regulations issued by national metrology (industrial measurement 2005 Volume 15, Issue 1)
Issuing agency(ies): State Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to the digital audio signal generator initial verification, testing and use of subsequent testing.

JJG 994-2004: Verification Regulation of Digital Audio Generators

---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.
Verification Regulation of Digital Audio Generators National Metrology Verification Regulations of the People's Republic Digital audio signal generator Released on.2004-09-21 Implementation of.2004-12-21 The General Administration of Quality Supervision, Inspection and Quarantine issued This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 21,.2004, and Implemented on December 21,.2004. Focal Point. National Acoustic Metrology Technical Committee Drafting unit. The Third Research Institute of China Electronics Technology Group Corporation China Shipbuilding Industry Corporation 701 Institute This procedure entrusts the National Acoustic Metrology Technical Committee to explain The main drafters of this procedure. Li Wei (The Third Institute of China Electronics Technology Group Corporation) Pan Yuewu (The Third Institute of China Electronics Technology Group Corporation) Pan Xiaoxiao (The Third Institute of China Electronics Technology Group Corporation) Liu Fangxiong (Seventh Research Institute of China Shipbuilding Industry Corporation) Participate in the drafters. Wang Liansheng (The Third Institute of China Electronics Technology Group Corporation) Zhu Chuanhuan (The 701th Research Institute of China Shipbuilding Industry Corporation) Tang Jun (The 701th Research Institute of China Shipbuilding Industry Corporation)

table of Contents

1 Scope (1) 2 Citations (1) 3 terms and units of measurement (1) 3.1 Digital Audio Signal (1) 3.2 Encoding format (1) 3.3 sampling frequency (1) 3.4 word length (1) 3.5 full scale level (1) 3.6 Folding frequency (2) 3.7 In-band frequency range (2) 3.8 Band upper limit frequency (2) 3.9 Out-of-band frequency (2) 3.10 Jitter (2) 3.11 unit interval (2) 3.12 rise and fall times (2) 4 Overview (2) 5 Metrological performance requirements (2) 5.1 Digital audio signal interface output amplitude (2) 5.2 Digital Audio Signal Amplitude (2) 5.3 Rise and fall time (2) 5.4 Jitter Signal Generator (3) 5.5 sampling frequency (3) 5.6 Sine wave signal generator frequency response (3) 6 General technical requirements (3) 6.1 Marks and instructions (3) 6.2 Marking (3) 6.3 Instrument Setup (3) 7 Measuring instrument control (3) 7.1 Verification conditions (3) 7.2 Verification items and verification methods (4) 7.3 Processing of verification results (7) 7.4 Verification cycle (7) Appendix A Example of Uncertainty Evaluation of Output Amplitude Measurement Results of Digital Audio Signal Interface (8) Appendix B Certification Certificate Page Format (10) Digital audio signal generator verification procedure

1 Scope

This procedure applies to the first verification, subsequent verification, and in-use inspection of digital audio signal generators.

2 Citations

This procedure refers to the following documents. SJ/T 11180-1998 "Basic Measurement Methods for Digital Audio Characteristics of Audio and Audiovisual Equipment" IEC 60958-1.1999 "Digital Audio Interface Part 1. General Part" (IEC 60958-1. Digitalaudiointerface-Part 1. General) IEC 61606-1.2002 "Audio and audiovisual equipment - Digital audio part - Basic method for measuring audio characteristics Part 1. General Part (IEC 61606-1. Audioandaudiovisualequipment-Digitalaudioparts-Basicmeasurement methodsofaudiocharacteristics-Part 1.General) When using this procedure, care should be taken to use valid versions of the above cited documents.

3 terms and units of measure

This procedure uses the terminology definition of SJ/T 11180-1998. 3.1 Digital audio signal (digitalaudiosignal) An audio signal represented by a series of sampled digital data. 3.2 encoding format (codingformat) A family of data streams with control information and consistent with the designed device under test. Note. Digital audio data is binary 2's complement data in this procedure. 3.3 sampling frequency (samplingfrequency) (fs) The sampling frequency of a digital audio signal is the rate at which continuous data sampling can be repeated for the corresponding channel. 3.4 word length (wordlength) The word length of the audio sample value is expressed as the number of bits when the least significant bit is not negligible, usually 8~24bit, etc. Wait. Note. There is also a word width (WordWidth). 3.5 full-scale level (ful-scaleamplitude) (FS) The signal level of a sine wave whose positive peak reaches the positive digital full scale does not use the encoded value of the negative number. For example, the maximum positive value of 16-bit data is 7FFFH, and the maximum negative value is 8001H. Note. (1) The full-scale amplitude sine wave negative peak of the 16-bit 2's complement code is the complement of the positive peak 7FFFH, that is, 8001H. (2) According to the relationship between the sampling instant and the signal frequency and phase, these peaks do not necessarily coincide at the sampling instant, so It is possible that it is inconsistent with any encoding in the signal. ......

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