IEC 62777 pdf free download

IEC 62777 pdf free download.Quality evaluation method for the sound field of directional loudspeaker array systems.
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
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.
5.2 PAZI-x
PAZI-x is defined as the 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. This index means a relative ratio of the average sound pressure level of the listener in front of the directional loudspeaker array system to those of the persons who are at the left side and right side of the listener.
PAZI-x =
5.3 PAZI-y
PAZI-y is the 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. This index means a relative ratio of the average sound pressure level of a listener in front of the directional loudspeaker array system to that of the person who is at the rear side of the system.
PAZI-y = F1(FB)
5.4 PAZI-xy
PAZI-xy is the 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. This index means a relative ratio of the average sound pressure level of a listener located in front of the directional loudspeaker array system to the sum of those of the persons who are neighboring the listener in a 2-dimensional plane, as shown in Figure 2.
PAZI-xy =
5.5 PAZI-xyz
PAZI-xyz is the 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 sides of the system. This index means a relative ratio of the average sound pressure level of a listener located in front of the directional loudspeaker array system to the sum of the average sound pressure levels of the persons who are neighboring the listener in 3-dimensional space.
PAZI-xyz =
6 Measurement of the sound pressure level for a personal acoustic zone
6.1 General
This standard shall be used in conjunction with IEC 60268-1, IEC 60268-2, IEC 60268-5 and IEC 61672-1.
6.2 Characteristics to be specified
The sound pressure level shall be specified as a function of frequency measured under free field condition at a specified constant voltage with sinusoidal signal.IEC 62777 pdf download.