ДСТУ EN IEC 60268-4:2022 Апаратура звукових систем. Частина 4. Мікрофони (EN IEC 60268-4:2018, IDT; IEC 60268-4:2018, IDT)



ДСТУ EN IEC 60268-4:2022
(EN IEC 60268-4:2018, IDT; IEC 60268-4:2018, IDT)

Апаратура звукових систем. Частина 4. Мікрофони

 
   
 
 
     
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

FOREWORD

1 Scope

2 Normative references

3 Terms and definitions

4 General conditions

4.1 General

4.2 Measurement conditions

4.2.1 General

4.2.2 Rated conditions

5 Particular conditions

5.1 Pre-conditioning

5.2 Sound source

5.3 Measurement of sound pressure

5.4 Voltage measuring system

5.5 Acoustical environment

5.5.1 General

5.5.2 Free-field conditions

5.5.3 Diffuse field conditions

5.5.4 Microphone coupled to a sound source by means of a small cavity coupler

5.6 Methods of measuring frequency response

5.6.1 Point-by-point and continuous sweep frequency methods

5.6.2 Calibration methods

5.7 Overall accuracy

5.8 Graphical presentation of results

6 Type description (acoustical behaviour)

6.1 Principle of the transducer

6.2 Type of microphone

6.3 Type of directional response characteristics

6.4 Application

7 Terminals and controls

7.1 Marking

7.2 Connectors and electrical interface values

8 Reference point and axis

8.1 Reference point

8.2 Reference axis

9 Rated power supply

9.1 Characteristics to be specified

9.2 Method of measurement

10 Electrical impedance

10.1 Internal impedance

10.1.1 Characteristic to be specified

10.1.2 Methods of measurement

10.2 Rated impedance

10.3 Rated minimum permitted load impedance

11 Sensitivity

11.1 General

11.2 Sensitivities with respect to acoustical environment

11.2.1 Free-field sensitivity

11.2.2 Diffuse-field sensitivity

11.2.3 Close-talking and near-field sensitivity

11.2.4 Pressure sensitivity

11.3 Rated sensitivity

12 Response

12.1 Frequency response

12.1.1 Characteristic to be specified

12.1.2 Method of measurement

12.1.3 Graphical presentation of results

12.2 Effective frequency range

12.2.1 Characteristic to be specified

12.2.2 Method of measurement

13 Directional characteristics

13.1 Directional pattern

13.1.1 Characteristic to be specified

13.1.2 Methods of measurement

13.1.3 Graphical presentation of results

13.2 Directivity index

13.2.1 Characteristic to be specified

13.2.2 Method of measurement

14 Amplitude non-linearity

14.1 General

14.2 Total harmonic distortion

14.2.1 Characteristic to be specified

14.2.2 Method of measurement

14.3 Harmonic distortion of the nth order (n = 2, 3, ...)

14.3.1 Characteristic to be specified

14.3.2 Method of measurement

14.4 Difference frequency distortion of second order

14.4.1 Characteristic to be specified

14.4.2 Method of measurement

15 Limiting characteristics

15.1 Rated maximum permissible peak sound pressure

15.2 Overload sound pressure

15.2.1 Characteristic to be specified

15.2.2 Method of measurement

16 Balance

16.1 Balance of the microphone output

16.2 Balance under working conditions

17 Equivalent sound pressure level due to inherent noise

17.1 Characteristic to be specified

17.2 Method of measurement

18 Ambient conditions

18.1 General

18.2 Pressure range

18.3 Temperature range

18.4 Relative humidity range

19 External influences

19.1 General

19.1.1 Specification and methods of measurement

19.1.2 Other external interferences

19.2 Equivalent sound pressure due to mechanical vibration

19.2.1 Characteristic to be specified

19.2.2 Method of measurement

19.3 Equivalent sound pressure due to wind

19.3.1 Characteristic to be specified

19.3.2 Method of measurement

19.4 Transient equivalent sound pressure due to "pop" effect

19.4.1 General

19.4.2 Characteristic to be specified

19.4.3 Method of measurement

20 Electromagnetic compatibility (EMC)

20.1 Regulatory requirements

20.2 Requirements for preserving programme quality

20.3 Performance criteria

20.3.1 Criterion A

20.3.2 Criterion B

20.4 Testing for immunity to disturbances in the presence of acoustical noise

20.5 Immunity to frequency-modulated radiated disturbances

20.6 Immunity to magnetic fields

20.7 Immunity to ripple on d.c. power supply

20.8 Permanent magnetic field

20.9 Evaluation and reporting of the test results

21 Physical characteristics

21.1 Dimensions

21.2 Weight

21.3 Cables and connectors

22 Classification of the characteristics to be specified

Annex A (normative) Additional characteristics

A.1 Characteristic sensitivity for speech

A.1.1 Characteristic to be specified

A.1.2 Method of measurement

A.2 Front-to-rear sensitivity index (0° – 180°)

A.2.1 Characteristic to be specified

A.2.2 Method of measurement

A.3 Noise-cancelling index

A.3.1 Characteristic to be specified

A.3.2 Method of measurement

A.4 Special characteristics for stereo microphones

A.4.1 General

A.4.2 Included angle of an XY (left-right) microphone

A.4.3 Acceptance angle

Annex B (informative) Sound insulation device

Annex C (informative) Recommendations for professional digital microphones

C.1 General

C.2 Data sheets for digital microphones

Annex D (informative) Recommended method for measuring noise levels according to ITU-R BS.468-4 in the digital domain

D.1 General

D.2 Recommended method

D.3 Matlab code

Bibliography