Specifications

1>Acoustics design service for cinema
2>High sound absorption wall panel
3>Easy installation
4>CE,SGS,ISO9001-2008

 

 

 

Home theater building acoustic design specification

 

1.Profile

With the improvement of people's living standard, more and more families bring into the home theater. Because the domestic space is limited, the small theaters usually are not very big. Up to size of 20-30 m2 , so we call it a home theater. Home theater is referring to the screening discs in the family, build the audio-visual environment similar to the cinema, enjoy the cinema of audio-visual effect.

Home theater equipment is divided into two categories, audio and video equipment. At this stage, the more common audio equipment including AV power amplifier, karaoke reverberator and speaker system; Video equipment has a projection screen, projector, etc. Home theater surround sound effect is mainly supplied with acoustic system. But if you have any good audio equipment, light and without a good indoor acoustical environment association, its effect will be not good. So, we must attach importance to the home theater acoustic design and decoration to the building. As to the high-fidelity audio, there are two aspects of meaning. One is the hi-fi playback sound, which shows the high fidelity of signal recording and playback; Secondly, high fidelity to listen to, that is, require good listening environment to restore the recording sound field. So that putting forward the higher demands for room acoustic conditions.

2. Standard

1.<mall theater acoustics design and certification standards>(QB/ZD 01-2013)

2.<Theatre, the cinema and multi-purpose hall architectural acoustics design specification>(GB/T 50356-2005)

3.<The cinema architectural design specification >JBJ58-2008

4.<The cinema audio-visual environment technical requirements>GB/T 3557-94

5.<Sound environmental quality standard>(GB 3096-2008)

6.<Hall amplification system design specification>(GB 50371-2006)

7. < Hall reverberation time measurement specification>GBJ76-84

8.< building sound insulation and absorption structure>(national building standard design atlas 08J931)

9.<Public construction engineering indoor environment pollution control norm>(GB50325-2001)

10.<code for fire protection design of buildings>GBJ16-1987(2001 edition)

11.<The code for fire protection design of building interior decoration>(GB50222-95)

12. <Civil building acoustic design specification>GB 50118-2010

13.<Technical specification of digital stereo cinema>GY/T 183-2002

14. the state administration of radio, the cinema star rating requirements

15. <the green building assessing standard>GB/T 50378-2006

 

 

 

3. Acoustical design

(1) code requirement

<Small theater acoustic design and approval standards> (QB/ZD 01-2013)

Table 3.2.3.1 small theater 500 ~ 1000 hz reverberation time

 

Room capacity	≤200 m3	200~350 m3	350~500m3
reverberation time(s)	0.15~0.35	0.25~0.40	0.30~0.45

 

The reverberation time and frequency spectrum characteristics should be within the scope of the standard, Intermediate frequency require straight, Low frequency can be slightly higher, High frequency can be slightly lower, but it should not exceed the limit.

 

Table 3.2.4.1 Each frequency reverberation time relative to the ratio of 500 ~ 1000 hz reverberation time

rate(Hz)	125	250	2000	4000
Ratio	1.0~1.5	1.0~1.25	0.7~1.0	0.55~1.0
Best Value	1.1	1.0	1.0	0.75

 

<Technical specification of digital stereo cinema> GY/T 183-2002

The ratio of relative reverberation time frequency 500 hz

(Hz)Frequency	The reverberation time ratio
63	1.0~1.5
125	1.2
250	1.0~1.1
1000	1.0
2000	0.8~1.0
4000	0.7~1.0
8000	0.6~0.9

 

 

 

(2)background noise

 

High quality of listening don't want any interference of the noise, Therefore, background noise limit shall not exceed the curve NC30 each band limits required, Or no more than 35 db (A) (Under the condition of normal operation of Cinema audience hall air-conditioning equipment, ventilation equipment.)

 

(3) Insulation against air-borne sound

 

Home Theater sound processing has two main purposes :                 

One is make the outdoor environment noise and noise in the next room life not listen and cause interference, and the second is

the high-pitched sound when the showing of films does not affect neighboring families. So when the sound source in the home theater issued 90db ( a ) when more than pink noise.

The room and the adjacent sensitive rooms (horizontal, vertical) sound pressure differential of not less than 45db ( a ).

 

 

Note: The "control" for the subjective evaluation of the Foundation,

you cannot continue with the evaluation are not met.

 

(5)Defects in the home theater sound quality, such as room size ( Dimensions )unreasonable, acoustic Reflex ( acoustic ) set unreasonable,

it is prone to some acoustic defect, will seriously affect the quality of listening, such as ECHO, flutterecho sound, sound dyeing, the focus of health, shelter, and so on.

 

1, ECHO: On the strength and the time difference is big enough in hearing and to distinguish the reflection of sound or voice returned for other reasons.

 

2, fibrillation: When the sound source in two parallel interface or contact between a plane and a concave reflector, when the distance between the interface is greater than a certain length, formed a series of echoes.

 

3, the sound of dyeing: Due to changes in frequency response of Interior, the original characteristics of timbre of the sound signal is given, plus (so that the original signal spectrum has some kind of change ).

 

4, the focus of health: concave surfaces form a concentrated reflection of sound wave phenomenon that allows sound energy to focus on a point or an area that the sound of loud, and the other regional voice was too low.

 

 

 

 

(6)Solution proposal

1. Sound-proof proposal:If every household wall is solid brick wall 24, the sound insulation is sufficient. If the light can be added together to strengthen the walls and soundproof insulation board composed of discrete cotton inside wall in order to improve its sound capabilities. Also missing doors and windows are sound and transparent sound weak link must be additional processing.

2. Sound proposal: To ensure a flat frequency characteristic of the reverberation time, the sound will not be distorted and the distortion should be noted that the use of sound absorbing material and a variety of sound absorbing structure, each absorb low, medium and high frequency sounds.