Acoustics

==//**Definitions:**//  ==

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It is the Distance Travelled in Unit Time (m/s). Differrent waves travel at diferent speeds. Sound can travels 330 metres every second (330 m/s). ======

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Longitudinal waves vibrate parallel to the direction of travel of the wave. Sound waves are longitudinal. ======

**//Sound sources - high speed film[[image:Sound_Wave.jpg align="right"]] //**
__Impulsive Sources__ Sound is normally caused by objects vibrating. Large objects that create large wavelength creates sound of lower pitch or lower frequency. Small objects create small wavelength and higher pitch or higher frequency notes. The travel of sound waves is similar to inflating a balloon. As the balloon gets bigger it becomes more transparent, that is because the rubber of the balloon has to spread out to a bigger area. The same thing happens to sound energy. With waves occur the same, as they expand they loose energy. __Sources of Impulsive Sound__ Acceleration noise occurs when air is blown in a low compression wave, for example, clapping your hands. The resonance is what remains after the acceleration noise that is why after clapping your hands you feel a vibration. When an object at high pressure crash forms a wave called the shock wave. __Whips & Sonic Booms__ Sonic booms is associated with super sonic aircraft or space shutter, you can se waves coming out the back, at the beginning the waves can get out of the way, but when the aircraft gets above the speed of sound this waves punch together and eventually form a short wave witch is the sonic boom you here, and that speed is called mac wave witch is the speed of sound. A whip can make a sonic boom. 




=Getting Information =

 "When designing for room acoustic comfort have the person, the room, and the activity in mind." Reverberance is linked to the speed at which sound energy disappears in a room. An unfurnished room with hard surfaces, such as a church, is perceived as being more reverberant than a well-furnished living room.  Room acoustics are about the way in which sound behaves in a room. Sound transmission, sound absorption, sound reflection and sound diffusion are all aspects that are important here. Room acoustics also include how we as humans perceive different acoustic phenomena. The field of building acoustics covers sound insulation too, where the route that the s ound takes from the room to other areas is included. ** A room and its acoustic quality should be a support for people and the activities in which they are involved. To create the correct acoustic conditions is to create Room Acoustic Comfort. Room acoustic comfort is an important element of the sound environment concept and this, along with light, air and perception of the room, is in turn a natural component of the total indoor environment. ** In many environments where people are present and communicate, high sound levels are perceived as one of the most disturbing factors. High noise levels have a negative effect on us and affect health, communication, safety, economy (effectiveness/productivity), learning and general wellbeing. ** - Added absorption and how it is placed - The quantity and placing of sound-scattering objects such as furniture, shelves etc. - The size and shape of the room **The sound level is essentially determined by: ** - The amount of absorption <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">- Early sound reflections in relation to late sound reflections - Background noise In general, when performing an evaluation of room acoustics, it is important to take into account different types of rooms and what people do there. The sound-absorbing ceiling is a practical aid for achieving Room Acoustic Comfort. The ceiling’s sound-absorbing properties are described in sound absorption classes (A-E) in an international standard. Class A is the highest level of sound absorption. **
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">__Reverberance Concept:__ **
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">__What are room acoustics?__[[image:vibration.jpg align="right"]]
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">__Room Acoustic Comfort – a natural part of the indoor environment__
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">__What do you as an architect need to consider regarding Room Acoustic Comfort™?__
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">The reverberation time is decided by: **<span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">Clarity of speech is essentially determined by: **
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">__What must you as an architect do to achieve Room Acoustic Comfort™?__
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">The ceiling’s effect on different acoustic descriptors: **
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">Reverberation time: **<span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);"> The sound-absorbing ceiling will interact with the sound-dispersing (scattering) furnishings in the room. The more sound-dispersing (scattering) objects there are, the greater the benefit of the ceiling. In a sparsely furnished room, the reverberation time can be long as the sound energy lingers between sound-reflecting walls.
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">Sound level: **<span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);"> The sound level that is constantly generated in the room will, on the other hand, be effectively dealt with by the ceiling and be less dependent on sound-dispersing (scattering) objects. A sound absorption class A product provides the most effective decrease of the sound level.
 * <span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);">Speech clarity: **<span style="font-size: 11pt; line-height: 150%; font-family: Verdana; color: rgb(95, 73, 122);"> Suspended ceilings have a positive effect on speech clarity by reducing the reverberance in the room. A good, effective, sound-absorbing ceiling contributes to a good relation between early and late sound reflections in such a way as to benefit speech clarity.



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