What is acoustic decoration?

Acoustic decoration refers to the renovation of the acoustic function of the existing space environment, including the professional combination of the space structure, suspension structure, sound insulation structure, sound absorption structure, acoustic reflection structure, acoustic diffusion structure, indoor air conditioning system, fresh air system, strong and weak current system, so as to achieve a reasonable reverberation time, sound insulation, local noise, And there should be no obvious defects such as related sound dyeing, standing wave, sound shaking, sound whistling, etc. at the same time, the sound in the environment should be clear, uniform and full, so that the final decoration effect can meet the requirements of relevant professional functions.

Now we introduce a case of acoustic decoration - film mixing studio

1、 Project overview and design ideas

1. Project overview

The existing empty room environment is renovated, and the professional acoustic decoration design is adopted, so that it can meet the functions of ADR dialogue recording, film Di color matching, post mixing production, video editing and so on. The whole area is divided into recording room and control room.

Control room: the room is 11.94 meters long, 6.2 meters wide, and the floor area is 74.028 square meters.

Studio: the room is 3.3 meters long and 2.3 meters wide, with a floor area of 7.59 square meters.

2. Design ideas

Jiansheng is to understand and grasp the functional orientation of each space, and in accordance with the relevant national standards and regulations. According to the requirements of users and professional use, according to the requirements of acoustic calculation and architectural acoustic design index, the design scheme carries out scientific and complete acoustic design, so as to determine the reverberation time, eliminate the sound quality defects, obtain the sound quality effect of film and television production standard, and adapt to the requirements of recording studio function. The interior decoration materials used reach the national fire protection standard B1 level or above. And do fire prevention treatment. The environmental protection index of all materials reaches E1 level stipulated by the state.

The design fully considers the possible acoustic defects and adopts high-density sound insulation materials. When the NR value is 25 and the sound insulation capacity of the wall is 55dB, the thickness of the sound insulation wall is about 15-30cm. In addition, the top resonator design of different frequency bands will not cause common acoustic staining and degeneracy.

2、 Design basis and index selection

Code for design and measurement of architectural acoustics JGJ / t131-2000

Code for architectural design jgj31-2003

Code for fire protection design of building interior decoration GB 50222-95

Environmental noise standard for urban area gb3096

Classification and test method of airborne sound insulation performance of Building Exterior Windows GB / t8485-2002

Classification and test method for air sound insulation performance of building doors GB / t16730-1997

Acoustics - Guidelines for the design of low noise workplaces - Code for noise control (GB / T 17249.1-1998eqviso11690-1:1996)

Evaluation standard of building sound insulation gbj121-88

Code for measurement of building sound insulation gbj75-84

Design standard of Dolby laboratory mixed recording shed

(Note: the above specifications are reference for construction)

Selection of architectural acoustic design index

1. In order to achieve the allowable noise value, the walls and floors of the room are required to have enough sound insulation. We use multi-layer sound insulation wall, the door should be multi-layer sound insulation door. The recording studio should have enough clarity and intelligibility, at the same time, it should also have a certain degree of fullness. Low noise, strong sound insulation. The distribution of sound field should be uniform, and there should be no acoustic defects such as resonance, vibration echo, standing wave, acoustic focusing and dyeing.

2. Reverberation time T60 design value selection:

The design standard value T60 of full frequency reverberation time is selected as follows:

Frequency (Hz): 20Hz ~ 20KHz

Low frequency: 0.3 ~ 0.5

Medium: 0.4 ~ 0.6

High frequency: 0.35 ~ 0.5

Design reverberation time (s) T60 ≤

3. The background noise is set as NR ~ 25