IEC 62777 pdf download.Quality evaluation method for the sound field of directional loudspeaker array systems
1 Scope
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.
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 i j P sound pressure level measured at the center of the surface j of the personal acoustic zone 3.4 average sound pressure level at a personal acoustic zone i P 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
4 Personal acoustic zone and sound pressure level
4.1 Personal acoustic zone The personal acoustic zone (PAZ) is defined as an acoustic space occupied by a person as shown in Figure 1 . The dimensions of the personal acoustic zone are defined as W (width), D (depth), and H (height). Considering the standard size of a person, the dimensions of the personal acoustic zone shall be stated.The average sound pressure level of the personal acoustic zone, P i , at the position of listener, as shown in Figure 2, is defined as follows: a) P F is the average sound pressure level of the personal acoustic zone in front of the directional loudspeaker array system; b) P L is the average sound pressure level of the personal acoustic zone at the front-left of the directional loudspeaker array system; c) P R is the average sound pressure level of the personal acoustic zone at the front-right of the directional loudspeaker array system; d) P B is the average sound pressure level of the personal acoustic zone at the rear of the directional loudspeaker array system; e) P U is the average sound pressure level of the personal acoustic zone at the front-upper of the directional loudspeaker array system; f) P D is the average sound pressure level of the personal acoustic zone at the front-lower of the directional loudspeaker array system.
IEC 62777 pdf download
