Reverberation Time and Adjustment of Recording

- Oct 08, 2018-

The so-called reverberation time means that after the sound source stops sounding, there is a sound "residual" phenomenon formed by the late reflection sound from each interface in the sound field. The length of this residual phenomenon is characterized by reverberation time. The reproducible time is generally defined as the time required for the attenuation of the acoustic energy density by 60 dB. The reverberation time of a certain frequency is that the indoor sound reaches a steady state. After the sound source stops sounding, the residual sound is repeatedly absorbed by the sound absorbing material in the room, and the average sound energy density decays from the original value to one part per million (the sound energy density is attenuated by 60 dB). The time required is expressed in T60 or RT. The reverberation time is too short, the sound is dry, boring and tasteless, and it is not friendly. If the reverberation time is too long, the sound will be confusing; when appropriate, the sound will be smooth and pleasant. Reverberation time is an important evaluation indicator for quantitative estimation of acoustic energy in acoustic design. Different rooms have different reverberation times due to different rooms. Broadcast recording studios are generally small, while rooms for recordings such as movies and TV shows are generally larger. But in terms of sound quality requirements, broadcast recordings focus on clarity, truth and nature. In addition to the clarity of film and TV drama recordings, the sense of environmental space and orientation should be expressed according to the content.

Frequency characteristic adjustment: The frequency is mainly flat, and the trend of gradually increasing the low frequency to the high frequency is based on hearing. This frequency characteristic reduces the possibility of low frequency humming while ensuring clarity and brightness. The high frequency should be lengthened and not adjusted too much.

Since the language recording studio generally uses close-range pickup, the main factor affecting the sound quality is the pre-reflection sound. The room should have different reverberation time and simulate different recording environments by adjusting the preset sound absorption board and reflector.



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