( a ) the total noise level

According to the" industry standard" requirement, SCT 1 in A sound file, print, measurement. If the noise is large, can change in spectrum measurement, the background noise spectrum measurement, print a line noise analysis was performed, in order to find noise source for processing.

( two) the reverberation time test

In the process of debugging, conducted the first test, should be a careful analysis of the architectural acoustics conditions, proposed the improvement opinion. The electrical input method for testing. According to the test, and careful analysis, when necessary, to test some data and curve printing, identify architectural acoustic problems, to correct evaluation;

The reverberation time and frequency relation between curve, such as a frequency of reverberation time in decline ( to multi-point measurement ), the frequency of the sound is absorbed too much of a problem, the rate of reverberation decay curve rises and fall bigger, may have three kind of situations: the point is in the front room has greater resonance or a flutter echo, specific situations to further analysis of this time may use the full band pink noise, so that the speakers are issued from the 40HZ-200HZ narrow band noise and sound pressure level, ordinary dance hall in 90dB-100dB, discotheques in 100dB-105dB " and can be heard clearly, see a room interior

Facing the resonance. These materials are caused by the excitation resonance, in the measurement of the spectrum can also cause greater error, such as sound level is small, do not produce resonance, the frequency of the spectral line level is not, when volume increase again, cause resonance, spectrum of these frequency level showed an immediate rise, actual acoustic resonance. The reverberation time decay curve of the fluctuation is very big.

If it is a rectangular room, acoustic processing is not good, if the mobile test point location, waveform improvement occurred, that it is likely that the test point is at a frequency in the front.

Since sound in indoor communication complexity, and PA equipment development will be to test, debug PA system brings a lot of new complex problems, to be the common study summary.