Acoustics


 * ====**Speed**: It**'**s the scalar quantity which is the magnitude of the velocity vector. The SI units for speed are ** m / s ** (meters per second). ====


 * ==== **Frequency:** The number of times a specified phenomenon occurs periodicly in a specified interval. In physics is the number of times that a periodic function or vibration repeats itself in a specified time. It is usually measured in hertz. Symbol **ν**, **//f.//** ====


 * ====**Wavelength:** Is the distance, measured in the direction of propagation, between two points of the same phase in consecutive cycles of a wave. Symbol **λ** ====


 * ====**Longitudinal**: Means along the length, running lengthwise, or (by extension) over the course of time. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. And these longitudinal waves are waves that have the same direction of oscillations or vibrations along or parallel to their direction of travel, which means that the oscillations of the medium (particle) is in the same direction or opposite direction as the motion of the wave. ====


 * ====**Transverse:**Crossing from side to side; athwart; crossways. A transverse wave is a moving wave that consists of oscillations occurring perpendicular to the direction of energy transfer. If a transverse wave is moving in the positive x-direction, its oscillations are in up and down directions that lie in the y-z plane. ====


 * ====**Reverberation Time:** 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.====

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 a being more reverberant than a well- furnished living room.

[[image:edgalialeandro1/long_reverberation_time_600.jpg width="304" height="304" caption="long_reverberation_time_600.jpg"]]
Speech clarity: 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. What are room acoustics? 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 sound takes from the room to other areas is included. Sound transmission, sound absorption, sound reflection and sound diffusion are all aspects of room acoustics
 * **Sound level: **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.

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. It is therefore important that you as an architect remember that room acoustic comfort does not only involve a certain reverberation time. To reduce sound levels, it is important to consider other descriptors that are directly linked to sound levels, such as Strength (G). The reverberation time is decided by: - Added absorption and how it is placed - The quantity and placing of sound-scattering objects such as furniture, shelves etc. <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">- The size and shape of the room <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">The sound level is essentially determined by: <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">- The amount of absorption <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">Clarity of speech is essentially determined by: <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">- Early sound reflections in relation to late sound reflections <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">- Background noise <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">Room Acoustic Comfort means that, when performing an evaluation of room acoustics, it is important to take into account different types of rooms and what people do there. Give priority to the different acoustic properties such as reverberance, speech clarity and sound level, depending on what the room is used for.
 * **<span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">What do you as an architect need to consider regarding Room Acoustic Comfort? **

<span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">·Sound level reduction will be most important in a kindergarten. <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">·In a music room, the response of the room in the form of reverberance can be the most important aspect. <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">·In a teaching situation, it is important to give priority both to speech clarity and to reduction of sound level. <span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">·In an open office landscape, it is essential that the sound propagation is restricted in order to minimise disturbance, mainly between different work groups. It is important that the sound level falls quickly with distance.
 * **<span style="font-family: 'Tahoma','sans-serif'; font-size: 13.3333px;">For example: **

**__INTERVIEW TO PROFESOR MURRAY.__**
He defines the phenomenon of sound as noise, telling us that it exists what it denominated a “signal”, that talks about the useful sound, raising a difference between useful sound and noise that is equivalent to wanted sound. Respecting to the sound while we're designing, he comments that a building is a physical system that has an requirement into the emotional sense for humans that create a movement, depending on the quality of the music. He made reference that the amount of noise in a place depends on the activity that is developed there, of the privacy that is desired to obtain, to differentiate the public zones and the consequences that the sound in the space can bring. The acoustics in the theaters depends as much on the priorities of the person as of the objectives that are desired to fulfill in the place.