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Listening room acoustic characteristics of the building

The quality of the sound replay audio equipment, and listen to the architectural acoustic characteristics of the environment has a very close relationship, to make the highest performance audio system must be listening room to do some acoustical treatment.For the listening room acoustic characteristics of the building, there are four areas which need to be taken into account, ① reverberation time, ② the spread of reverberation attenuation characteristics, ③ the frequency characteristics of the room, ④ ambient noise sound level.Listening room acoustic characteristics of different buildings, different objects, reflection and absorption of sound is also different, so as to improve the listening environment of the acoustic treatment to improve the acoustic defects of the work becomes very complicated. Whenever possible, it is best to avoid the room of any size on both sides of the same, or one side is exactly twice the other side, that is, square or aspect ratio is twice the room, because the proportion of the room will produce standing waves, low frequency acoustic resonance , resulting in coloration.The room from the walls, ceilings, floors, furniture and personal reflections formed by the voice repeated the persistence of a gradual decay of the phenomenon, known as reverberation (rever beration, also known as the cross-mixed response). It and the echo (echo) is different from echo attenuation is not a smooth voice but the sudden return. For the most important indicator of room acoustics, first reverberation time, which is the attenuation of sound energy down to the original strength of parts per million (60dB) the time required for an identified room, reverberation time depends on acoustic treatment. For the Hi-Fi listening room reverberation time, it is desirable 0.4 to 0.5 seconds. Reverberation time can moderately plump tones, voice full, sound reverberation time longer than the rich, lively, but the sound is too long, easy to vague, voice clarity down the lack of intensity and a sense of rhythm tones, reverberation time is too short then the sound than the dry hard, the lack of anger, there is no reverb speaker (such as outdoor) are often stiff feeling.Dispersion characteristics of the room is good, then the sound attenuation of smooth, feel the sound evenly throughout the room. Sound waves have spread to any convex capacities, including slope, surface and the convex arc, when the need for the proliferation of restricted convex size of the sound wave frequency, the proliferation of boards can be used for processing.When the voice for some causes of a particular frequency to be strengthened or weakened over time, it will undermine the uniformity of the sound within the room, a phenomenon we call sound staining (sound coloration). For example, the standing wave can change the voice of the original characteristics of peaks in certain frequency bands, improved interior materials is placed to avoid symmetry.The listening room large space not only help low-frequency extension, but also to make the sound feel more relaxed, more live feeling. Generally used as a listening room, my living room area of about 14m2, around 2.8m high, volume of approximately 40m3. In this room, as long as the acoustic handled properly, it should be listening to have a good effect. As the wavelength of the sound below 100Hz is greater than 3.4m, and the size of the room at the same order of magnitude, so its space can only lead to several resonance frequency, low frequency sound waves interfere with each other less, it sounds like a natural rounded look. However, the high-frequency sound waves is less than the long-term space size, will generate a large number of standing waves in indoor, in the standing wave

 

 


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