This standard specifies methods of measurement for the acoustics characteristics in auditoria equipped with sound reinforcement facility.
This standard is applicable to measurement for all manners of auditoria and others equipped with sound reinforcement facility.
This standard doesn't reject to other measurements which can supply equivalent accuracy.
1. Subject content and applicability 2
2. Normative reference 2
3. Terms 3
4. Measuring conditions 4
5 Measuring instruments 5
6 Measuring methods 9
6.1 Characteristics of sound reinforcement 9
6.1.1 Transmission〔amplitude〕frequency characteristics 9
6.1.2 Sound transmission gain 12
6.1.3 Maximum sound pressure level 12
6.1.4 Unevenness of acoustic field 14
6.1.5 Harmonic distortion of system 14
6.1.6 Total noise 15
6.2 Architectural acoustics items related to sound-reinforcement characteristics 16
6.2.1 Background noise 16
6.2.2 Reflection sound time distribution 16
6.2.3 Reverberation time 17
6.2.4 Regeneration reverberation time 18
6.3 Speech transmission index tester 19
6.4 Measuring method for Chinese articulation 22
This standard specifies methods of measurement for the acoustics characteristics in auditoria equipped with sound reinforcement facility.
This standard is applicable to measurement for all manners of auditoria and others equipped with sound reinforcement facility.
This standard doesn't reject to other measurements which can supply equivalent accuracy.
Contents of GB 4959-1995
1. Subject content and applicability 2
2. Normative reference 2
3. Terms 3
4. Measuring conditions 4
5 Measuring instruments 5
6 Measuring methods 9
6.1 Characteristics of sound reinforcement 9
6.1.1 Transmission〔amplitude〕frequency characteristics 9
6.1.2 Sound transmission gain 12
6.1.3 Maximum sound pressure level 12
6.1.4 Unevenness of acoustic field 14
6.1.5 Harmonic distortion of system 14
6.1.6 Total noise 15
6.2 Architectural acoustics items related to sound-reinforcement characteristics 16
6.2.1 Background noise 16
6.2.2 Reflection sound time distribution 16
6.2.3 Reverberation time 17
6.2.4 Regeneration reverberation time 18
6.3 Speech transmission index tester 19
6.4 Measuring method for Chinese articulation 22
