[Home Theater Network HDAV.com.cn] According to the THX standard, the ideal audio-visual space should reach:
a. Whiteness and accuracy
b. Accurate sound localization
c. Smooth panning movement
d. A very spatial surround sound field
e. Balanced sound
f. Fast and compact low frequency performance
g. Broad dynamic range
h. Each position is emperor
In order to meet the above acoustic design requirements, there are four aspects that need to be considered for the following aspects:
a. Reverberation time
b. Diffusion characteristics
c. Frequency characteristics of the room and various sound defects
d. Environmental noise level
If the acoustic design is not handled properly or not processed, the following situations can occur:
a. 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 ambiguous, the reflection sound will cover the spread of the direct sound, the sound position will be chaotic, and the sound will be unclear. If you enlarge the volume, it will also enhance the energy of the reflected sound, which makes people feel noisy and seriously affects the sense of hearing;
b. The indoor sound field is uneven, the sound of each frequency band is unbalanced, the sound is not round; it is not pleasant; it is not full; it is not warm. The surround sound field does not produce a good sense of envelopment.
c. There are serious acoustic defects such as standing waves, resonance, and tremor echoes in the room. These defects seriously affect the sense of hearing.
d. Background noise affects the quiet room environment and affects the audiovisual experience. Or the sound of audio equipment affects the lives of others.
About the absorption of sound waves in acoustic design
Through the analysis and calculation of the volume structure of the room, the combined absorption is performed for the high frequency 2KHz~20KHz, the intermediate frequency 500Hz~2KHz, and the low frequency 20Hz ~ 500Hz. According to the sound absorption coefficient curve of each material, the sound absorbing materials of each frequency band are reasonably arranged to the wall. On the body, ground and top structure, the reverberation time of the audio-visual room is optimized, and the integrated curve structure area is straight, so that the sound absorption in each frequency band is balanced.
About the diffusion of sound in acoustic design
The diffusing characteristics of the room are good, the sound attenuation is smooth, the sound in the room is evenly felt, the sound is soft and not distorted, and the sound details are more clear and true. The diffuser can be arranged according to the specific conditions of the room to achieve the best diffusion effect.
On the treatment of sound defects in indoor acoustic design
Standing wave is an inevitable room problem. Standing waves are generated in all rooms. The superposition of standing waves is closely related to the ratio of each side of the room. The resonance intensity of standing wave depends on the density and hardness of the wall material. It introduces resonance and causes an uneven room frequency response. At the same time, most of the problems caused by standing waves occur in the frequency range of 30-200 Hz.
Resonance is caused by the contact of sound waves with objects in the room. Loose keels, veneers, lamps, furniture, and door pockets may resonate. Checking the resonance can use the signal generator to play a 20Hz-1KHz scan signal.
The phenomenon of sound tremor caused by multiple reflections between parallel walls is a serious construction defect, which may result in unstable sound volume and poor sound quality.
In addition, the audio-visual room will also have acoustic defects such as acoustic focusing and acoustic dyeing, which will seriously affect the sense of hearing.
The sound quality of audio equipment plays a very close relationship with the acoustic characteristics of the building. To make the sound system perform at its highest performance, it is recommended to give the acoustic decoration to professional people.
More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
Note: This article is transferred from HIFI. The article is an independent view of the author and does not represent the position of the home theater network.
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