![]() ![]() The thicker the insulator, the better is the absorption. The thickness of material plays an important factor. For instance, cotton does much better for mid to higher end frequencies while fiberglass equally works for low end. Every material provides different amount of absorption, which as well varies depending to the frequency. This would include things like styrofoam, fiberglass, soft woods, cotton, etc. Generally, soft and porous materials do quite well for absorbing sound. ![]() When the sound isn’t reflected it is being absorbed. AbsorptionĪbsorption can be described as the opposite of reflection. ![]() Keeping down the theory, this will mean added coloration for some frequencies, and may also result in resonation with different objects, producing different rattling or ringing sounds. In a standing wave, the sound is being reflected in the same phase that results in increase of the sonic amplitude. Finally, there is a third type of reflection called a standing wave. And guess what, an amateur singer recorded on tape professionally will sound more acceptable than a professional singer with amateur recording. Being able to sing or play instruments is one thing, but being able to record is another and both are equally important. Otherwise, even if you have a fantastic voice you will still sound dull and surreal. However, in recording you always want to keep it down to minimum, especially home and in studio. Every room has its own, unique reverberation, which can be both pleasant and unpleasant. Reverberation is when the sound ‘stays’ in one room by keeping on reflecting back and forth. Echo is simply a repeated sound with a delay, the larger the distance, the bigger the delay. There are three basic kinds of reflection that can be easily distinguished by anyone. This is why, even though you may sound great playing or singing live, when you try to record it sometimes it just doesn’t work. In recording, mics are much more pickier to those sound reflections than human ears. You may easily verify it by voicing in an empty room, then in a furnished or a cluttered room. Hence, room walls can reflect the sound pretty evenly while any other things in the interior will likely add some coloration to the sound. Usually if an object is large enough, it can reflect any frequencies and if an object is small only higher frequencies will be reflected. ReflectionĪlthough any solid object can possibly reflect the sound, the degree of reflection as well as frequency specter of reflected waves may vary. This can mean many things but for the room or studio recording, it mainly comes down to reflection and absorption, and this is what we shall discuss in this article. Basically, acoustics is a number of factors that determines the propagation of sound in one or another environment. The main reason you don’t sound all right is the so-called bad acoustics. The reason why this happens often has nothing to do with the mic, although a wrongly chosen model can be another significant factor. For this purpose, two parameters have been introduced: the energetic deviations index and the true reflection angle.A lot of people buy expensive microphones for recording just to find out that they still sound awkward. The aim of this work is to define the far and the near field above a porous material where the results obtained considering a plane excitation may or may not be respectively extended. Conversely, to the case of a plane wave excitation, on the porous material surface different incidence angles can be observed and the phase relation between the pressure and the particles velocity should be considered. In this paper, a simple case of a point source above a uniform infinite layer of porous material has been analysed. Therefore, it is interesting to understand the real behaviour of porous materials. However, in real situations, no plane wave exists, and the sound field is more complex. Plane-wave acoustic properties such as the sound absorption or reflection coefficient at normal incidence can be quickly obtained using standing wave tube or theoretical models and can be used to select the type of porous material and its dimensions. Many noise control applications are based on the use of porous materials therefore, it is important to have a tool to simulate acoustic behaviours. ![]()
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