IEC 62777-2016 pdf download.Quality evaluation method for the sound field of directional loudspeaker array systems.
This International Standard applies to directional loudspeaker array systems of any kind, and to the parts of which they are composed or which are used as auxiliaries in such systems. This standard deals with the determination of the performance of directional loudspeaker array systems, the comparison of these system types, and the determination of their proper practical application, by listing the characteristics which are useful for their specification. It specifies uniform measurement methods for these characteristics. This standard is restricted to a description of the audio space around a person and the relevant method of measurement. It does not consider characteristics of loudspeakers, which are specified in IEC 60268-5.
2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60268-1 , Sound system equipment – Part 1: General
IEC 60268-2, Sound system equipment – Part 2: Explanation of general terms and calculation methods
IEC 60268-5, Sound system equipment – Part 5: Loudspeakers
IEC 61672-1, Electroacoustics – Sound level meters – Part 1: Specifications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 personal acoustic zone
PAZ acoustic space occupied by a person
3.2 personal distance
distance between listeners and a directional loudspeaker array system
3.3 sound pressure level at a personal acoustic zone
sound pressure level measured at the center of the surface j of the personal acoustic zone i
3.4 average sound pressure level at a personal acoustic zone
mean value of the sound pressure levels measured at the centers of the surfaces of the personal acoustic zone i
3.5 personal acoustic zone index
PAZI ratio of the average sound pressure level of the personal acoustic zone for a listener, to the total average sound pressure levels for listeners around the directional loudspeaker array system located at a specified personal distance
3.6 personal acoustic zone index-x
PAZI-x ratio of the average sound pressure level of the personal acoustic zone of a listener in front of the directional loudspeaker array system to the sum of the average sound pressure levels of listeners at the front, the front-right, and the front-left of the system
3.7 personal acoustic zone index-y
PAZI-y ratio of the average sound pressure level of the personal acoustic zone of a listener located in front of the directional loudspeaker array system to the sum of the average sound pressure levels of listeners at the front and the rear of the system
3.8 personal acoustic zone index-xy
PAZI-xy ratio of the average sound pressure level of the personal acoustic zone of a listener located in front of the directional loudspeaker array system to the sum of the average sound pressure levels of listeners at the front, the front-right, the front-left and the rear of the system
3.9 personal acoustic zone index-xyz
PAZI-xyz ratio of the average sound pressure level of the personal acoustic zone of a listener located in front of the directional loudspeaker array system to the sum of the average sound pressure levels of persons at the front, the front-right, the front-left, and the rear, and the front-upper, and the front-lower of the system.IEC 62777 pdf download.