Reference to the value of reverberation time in various listening environments
November 06, 2020
The way the sound decays in the room is an important factor affecting sound recording. The effect of reverberation on sound is two-sided, which can be better or worse. Reverberation time is an important condition. Reverberation time refers to the time between when the sound source stops sounding and when the sound completely disappears. A more technical description of the language is the time it takes for the sound to decay by 60 dB. For recordings of language and vocals, the reverberation time must be very short ("silent" room). The reverberation time of the control room is relatively short. The reverberation time between music receptions usually depends on the type of music. The impulse response of a room (the sound is taken from an exploding balloon) shows all the independent reflections. Convert the sound to a level value (this can be read in dB) Frequency analysis of reverberation time. The signal has been processed by a filter. In this example the low frequency (63 Hz) reverberation time has exceeded the limit and this sample is taken from a small room for sound editing. In general, the key issue is the change in reverberation time with frequency. If the low frequency reverberation time is too much than the intermediate frequency, it will cause a lot of trouble. In the studio and control room, a low frequency reverberation time of less than 125 Hz is typically 1.5 times the intermediate frequency. However, in the rock music scene, the reverberation time of the low frequency is more similar to the intermediate frequency. The following is the reverberation time (at 500Hz) that is generally used in different applications:
Application reverberation time (seconds) Vocal room 0.1 – 0.2 The room should not be too small. A room that is too small will bring a box-like sound, and there will always be low frequency problems (low frequency is too heavy) Control Room 0.2 – 0.3 If you want to play some acoustic instruments in the control room, then the reverberation time can be slightly higher. Recording room 0.4 – 0.6 Living Room 0.4 – 0.5 If your room has only five speakers and a wooden chair, then the reverberation time is likely to exceed this value. Hall 0.6 – 0.9 Both the volume of the language and the intelligibility of the theater are guaranteed. – 1.0 To ensure balanced playback quality rock music live (small) 0.6 - 1.6 to have a balanced frequency response. The room has a volume between 1.000 m3 and 10.000 m3. Theater 1.1 – 1.4 The opera house is about 1.6 reverberation time to make the singing sound have enough sustain, but also to ensure a certain intelligibility. Classical music hall 1.8 – 2.2 can float up and down according to the size and music type of the hall
Calculation of reverberation time T = 0.161 * V / A T represents the reverberation time, in seconds, V represents the volume of the room, in cubic meters, A represents the total sound absorption coefficient of the room. The total sound absorption coefficient is based on the sound absorption coefficient of each material in the room multiplied by the total area of ​​the material. (square meters) derived. This formula applies to any sound frequency that needs to be calculated. The usual calculation method is to use an octave bandpass from 63 to 8 kHz or a 1/3 octave bandpass from 50 Hz to 10 kHz.
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