专业音响 - C-MARK 房间的声学特性（Professional acoustics - acoustic characteristics of C-MARK rooms）.doc

专业音响 - C-MARK 房间的声学特性（Professional acoustics - acoustic characteristics of C-MARK rooms） Acoustic characteristics of a room When the sound source is in the room, the sound transmission is limited by the closed interface. Because of the repeated reflection of the surface, complex interference appears, which makes the sound field in the room completely different from the outdoor situation. The interference of sound field has great influence on the sound condition in the room, and the influence of room on the sound field is mainly: 1. Cause a reflex sound. 2, change the transient characteristics of language and music. 3, increasing the sound energy density. 4, the distribution of sound energy in space is changed. 5, due to absorption and resonance, resulting in uneven frequency response. Two, indoor acoustic process When the sound in the space of a point, it will cause a series of sound waves around it, to the sound source as the center, spherical layers outward freely when they encounter obstacles such as walls, floor, part of the sound energy is absorbed, the other part of the sound energy is reflected by the reflection of sound waves the new direction of propagation continues to spread, until the next encounter obstacles, and generate new absorption and reflection. As shown. The multiple reflections and attenuation of sound waves in the interior is a very complex acoustic process, which has a major impact on the sound quality of the room. So when we speak indoors, the listener always hears the direct sound coming from the source, and then hears the reflection from the wall. That is to say, the sound field in the room can be regarded as the superposition of direct sound and various reflecting sounds. In short, the total indoor sound pressure level and only depends on the free field distance between sound source is different. Near the sound source, the total sound pressure to direct sound and reverberation sound (i.e., the sum of the reflected sound) can be ignored,