Study of professional sound engineering technology must first understand the relevant technical terms and some relevant national and industry standards, the only way of professional design and construction in order to accomplish have a definite object in view, the project quality can be fully guaranteed. Further, all and engineering related professional standards and terminology is the engineering work of the foundation, is the basis and reference for design and construction, is in the center of. Here are some must learn seriously comprehend terminology and standards.

SPL: refers to the actual sound and the reference sound pressure ratio of 20 times on the numerical, is measured in decibels. This is its mathematics expression. Its importance lies in the fact that: all the sound system sound, all the PA workplaces acoustic quality, need to have this index, in the back of the calculation in design it is a calculation basis.

Reverberation time: refers to a stable sound signal is interrupted suddenly, hall sound pressure levels within the time required to drop 60dB, the unit is seconds. Its mathematics expression is as follows. Can be found, the reverberation time is the decoration and construction of structures and materials are closely related to the parameters of. In the practical engineering, the reverberation time is hall building acoustic effects of important research index.

PA power: refers to system design rated PA sound level, sound reinforcement equipment required for the rated power, unit is tile. The parameters in the actual sound regulation not very important, but in the sound system design and selection, it is acoustic indicators in the electroacoustic parameters on the direct embodiment, and it will be related to the project 's final cost, so it is particularly important. Generally in engineering, it mainly depends on the speaker 's rated power to reflect.

GB-3947 GB, is a professional acoustical terminology explanation: GB-4959 GB, is sound reinforcement characteristic measuring method; GYJ-25, is the sound reinforcement system of acoustic index. They are two important national standard, almost all of the works in the design, construction, acceptance when they need them as basis; national standard GB / T14218-93, electronic dimming equipment performance parameters and measurement methods; SJ2112-82, is a sound reinforcement system equipment interconnection is preferably electrical matching ＆#118alues. The two criteria in the selection of equipment and engineering acceptance test plays an important role in.