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The home theater covers an area of 30m², height 2.8m. Belongs to a small family theater. This place is mainly used for film and television works appreciation and karaoke function, so acoustic environment of the places requirements reverberation time control in between 0.4~0.6s. In the absence of processing acoustic sound field may be uneven, quality defects phenomenon was obvious. In order to meet the quality requirements of the property, it must adopt measures to adapt to the acoustic treatment.

 

This home theater covers an area 44 m², as high as 3.2m. Belongs to a small family theater. This place is mainly used for the appreciation of film and television works, so acoustic environment of the places requirements reverberation time control in 0.3s. In the absence of processing acoustic sound field may be uneven, quality defects phenomenon was obvious. In order to meet the quality requirements of the property, it must adopt measures to adapt to the acoustic treatment.

 

Acoustic insulation damping diffusion

1 Introduction

A good home theater design, we must first understand the location area size, storey (ceiling to floor distance). Secondly, in terms of customer communication function in the use of the premises, decoration style, the place whether you need to sound processing. In order to ensure that the function with real the normal use of the venues sound environment requires a suitable speech intelligibility and reverberation, which has a good sound effects.

Design goals:
1) to obtain a suitable indoor space reverberation time and reverberation frequency characteristics, frequency reverberation time controled in 0.3-0.5s range, in order to achieve good sound quality and speech intelligibility environment.
2) standing silent, focused sound, coloration and other acoustic defects.

2 the basic design parameters
2.1 reverberation time
T60 reverberation time is when the indoor sound field reaches a steady state, so that the sound source to stop the sound, from now until the decay 60dB SPL elapsed time. Evaluation is one of the most important room quality objective indicators.

T60 is calculated as follows:

1533007098885204.jpg

Among them, the indoor average absorption coefficient:

1533007132168013.jpg

 

 

V - room volume, m³; S - Interior total surface area, m²;
α - indoor average absorption coefficient; m - air acoustic attenuation coefficient (M-1);
S - the surface area of each part of the interior, m²; α i - Si corresponding to the absorption coefficient;
N j - the number of persons or objects, m²; α j - Ni and the corresponding absorption coefficient.

The length of the reverberation time directly affects the listening effect. Reverberation time is too long will affect the listening clarity and may cause the system to produce sound and howling sound system is not conducive to sound transmission gain. Too short, make the sound becomes dry, strength becomes weak, unnatural sound affect people's ability to distinguish normal. This requires reasonable layout of sound-absorbing material, the frequency characteristic curve tends to be substantially flat, in order to achieve an

appropriate reverberation time.

2.2 Background noise (RN)
Ambient noise outside the building including ambient noise and ambient noise within the building.
Building exterior ambient noise include: transportation noise, factory noise, construction noise, noise business, social life noise. Ambient noise in the building include: floor pump room, air-conditioned room and elevator equipment room space, crowd noise in the lobby and corridors of the upper and personnel activities crash like.

Architectural environment noise including: fan room, pump room, refrigeration engine room and so on various equipment room and indoor ventilation system generated noise.

2.3 no low-frequency resonance, coloration and other quality defects

3 the standard specification and design basis
1) hall sound system design specifications"(GB 50371-2006);
2) building sound insulation and sound-absorbing structure"(National Building Standard Design Atlas 08J931)
3) interior decoration of buildings for fire protection design》 (GB 50222 - 95)
4) civil engineering indoor environmental pollution control》 GB50325-2001
6) sound environmental quality standards"GB3096-2008
7) reverb time measurement norms"GBJ76-84;
8) theater, cinema and multipurpose halls architectural acoustics design specification"GB / T 50356-2005
9) cinema building design codeJBJ58-2008
10) the requirements of Party and related construction, decoration drawings

 

4 home theater acoustic analysis
Acoustic following major questions:
1, any acoustic material is not installed, the reverberation time is too long, listening cloudy.

2, there is a parallel to the wall, standing wave greater impact.

 

4.1 insulation program
In order to avoid the external environment of places caused to adjacent rooms separated causing unnecessary noise interference and space use, make the appropriate interior insulation measures. Recommendations are as follows:
Wall: four weeks of wall and pillars are made of T-268 type acoustic panel, the product can better improve the sound insulation wall effectively achieved with room isolation room. Plus hollow brick surface 240, the amount of noise less than 55dBA. Can effectively block the propagation of sound, the structure shown in Figure 1.

Smallpox: smallpox using shock absorbers, efficient insulation board, cotton insulation and other materials. Composition soundproof structure, can effectively reduce the penetration of the original floor, play good sound insulation. Reach more than 50dB sound insulation effect, the structure shown in Figure 2.

Floor: Ground a "floating floor" structure, can effectively prevent the spread of impact sound. Impact sound insulation to achieve 20dB or more. The structure shown in Figure 3.

1533007175912572.jpg 

         Figure 1                 Figure 2                Figure 3                                                

4.2 sound design
4.2.1 Smallpox
1, ceiling mounted horizontally QRD diffuser, diffusion dispersion installation, which can effectively disperse sound energy, sound field distribution.

1533007192702820.jpg 

 

2clouds diffuser

1533007243439750.jpg

 

4.2.2 Wall
Both sides of the wall, the back wall installation of 50 / 100mm plate absorber and diffuser. Installation is staggered installation.
Front wall down: Install DW5 corners each corner a diffuser, projection screen Surrounded by acoustically transparent cloth.

1533007255112625.jpg 

 

4.2.3 Ground
1, the installation of solid wood flooring
2, Carpeting

 

5 the design effect
5.1 nice decoration, good visual feel comfortable.

5.2 sound absorbing material is not glass fiber particles of dust pollution, no formaldehyde pollution, meet environmental requirements in the workplace air quality.
5.3 has a good sound. That low, medium and high frequency proper balance to achieve full-frequency sound absorption effect.
5.4 sound-absorbing material to meet fire rating requirements.
5.5 spaces clearer listening, silent staining quality defects

 

6 material performance requirements
The performance requirements of the materials used in this design are as follows:
1) acoustic absorption performance to meet the requirements of acoustic design;

2) no glass fiber dust pollution, meet environmental requirements;
3) formaldehyde emission reach E1 standard;
4) sound-absorbing materials fire performance meet fire safety requirements.
5) having a mildew proof performance;
6) has excellent durability, stability and resistance to mechanical damage characteristics.
6.1 plate absorber
(1) Structure: Finished
(2) Structure thickness 50 / 100mm.

(3) the fire resistance performance of is above B1 level.
(4) the surface material used to meet the requirements of the formaldehyde release of GB18580-2001, that is, the amount of formaldehyde release is not greater than 1.5mg/L.

6.2 dispersion
(1) structure: N1, N2, N3, D1, D2, D6, D6W, DW5 dispersion
(2) the conventional: the size of 600*600/1200/1800/2400*100mm, 

300*1800/2400*70mm.
(3) fire protection performance reaches B1 level above level.
(4) the surface material used to meet the requirements of the formaldehyde release of GB18580-2001, that is, the amount of formaldehyde release is not greater than 1.5mg/L.

7 the program features
7.1 Acoustic calculated using the mature years of experience and calculation software to calculate;
7.2 place hum some improvement.
7.3 beautiful acoustic materials, plasticity.
7.4 no glass fiber and formaldehyde dust pollution, meet environmental requirements;
7.5 fire performance materials to meet fire safety requirements;
Good impact resistance and antifouling properties 7.6 wall of sound-absorbing material

 

Explanation
To ensure the sound absorption effect to the design to meet the design criteria measures are:
1) The program is based on the specific acoustic materials simulation, analysis, calculation, and should be strictly in accordance with the acoustic parameters of the design is based on acoustic material, in order to meet the design effect. Such as the replacement of the building acoustic materials, architectural acoustics engineers need after identification before use;
2) the quality of construction should be strictly accurate, the construction process, must be applied in accordance with the design of the acoustic material parameters identified, is subject to change should inform the acoustic engineers, and accounting before replacement confirmation.

Usually teenagers 20-20kHz, middle-aged 30-15kHz, elderly 100-10kHz frequency audible range limits.

The human ear has a certain degree of adaptability ordinary limit of 120dB, noise often exposed person may reach 135-140dB.

You might think that the whole interior with a soft voice processing package to create indoor sound effects, in fact, this is a misunderstanding; one of an acoustic absorption treatment only; sound absorbing sound muddy or too much can cause tinnitus; spatial acoustic processing include: Bodybuilding sound absorption, sound insulation, noise reduction, shock absorption and diffusion.

 

The so-called home theater, as the name suggests, is to show DVD in the family, and create a visual environment similar to the cinema and enjoy cinema like visual renderings. Home theater equipment is divided into two types of audio and video equipment. Present more common audio equipment including AV (Audio and Video abbreviation of the audio and video of the meaning) amplifier, Karaok reverberation and speaker system; video device has a large screen TV (25 inches), laser disc player ( LD), a small player (VCD) or high-fidelity stereo recorder (VCR) and the like.

Home theater room acoustics many indicators, the main is the reverberation time and background noise. Home theater and stereophonic cinema, the acoustic environment mainly should ensure the film in the recorded sound faithfully replay, do not want to indoor acoustic condition of original sound field cause too much impact, so reverberation time should be shorter, the general control between the 0.3-0.5s. Frequency characteristics of reverberation time should as far as possible to keep straight, i.e., low, medium, high frequency reverberation time should be approximately the same. On the other hand, the high listening to sound quality do not wish to receive any noise interference. 

Therefore, indoor background noise level requirements is low, should be controlled at the level of 35-40dBA.



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