According to the" industry standard" test requirements and methods of test. Due to test the relationship between. Reasonable test sequence is: transmission frequency, sound distribution, maximum sound pressure level, transmission gain, total noise level and reverberation time. Five indicators of test methods in a" standard" has been clearly stipulated in the reverberation time, the test introduces as follows: reverberation time measurement method should be according to the GB4959, test microphone placed deviates from the center line of the 0.8-1M field, after 2 / 3, SCT a 1 memory is cleared, and placed in a reverberation test function. Manually or automatically measured from 1OOHz-8kHZ reverberation time, print out the necessary reverberation decay curve, inspection data, to clear interference caused by the error data. To print the frequency of reverberation time and reverberation time and frequency curve: