ACOUSTICS

**Frequency: ** Number of complete waves in one second (Hz) **Wavelength: ** Distance between matching points on the wave (m) **Longitudinal: ** Vibration parallel to direction of travel **Transverse: ** Vibration at right angle to direction of travel Sound is caused by the vibration of objects, transmitted by air, solid or liquid. - The variations in pressure is what gives you a sound wave -The amplitude of the sound wave determines the loudness, the bigger, the louder. - The frequency determines the pitch. The higher the frequency is (more complete cycles of sound waves per unit of time), the higher the pitch will be. - Your voice is the complex creation of the waves produced by the vocal chords. These waves travel back and forth in the cavities of the mouth, nose, and head before actually getting out of your mouth. All those reflections inside the cavities determine how your voice sounds. This explains why your voice changes when you have a cold for example. 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´s  a number of measurable room acoustic descriptors have been defined. These descriptors can be used to formulate room acoustic specifications and to check the effect of different procedures Reverberation is linked to the speed at which sound energy disappears in a room <span style="color: #363636; font-family: Calibri,sans-serif; font-size: 10pt;">Speech clarity concerns the quality of speech transfer to the listeners. In a reverberant room with disturbing background noise, it can be difficult to pick up speech. <span style="color: #363636; font-family: Calibri,sans-serif; font-size: 10pt;">Auditory strength is the level at which we experience sound. A reverberant room gives a higher sound level than a room with added sound absorption. <span style="color: #363636; font-family: Calibri,sans-serif; font-size: 10pt;">The sound level decreases as the distance from the sound source increases. The design of the room (shape, furnishing, surface finish etc.) influences the extent to which the sound level decreases along with the distance. <span style="color: #363636; font-family: Calibri,sans-serif; font-size: 10pt;">The way sound behaves and affects the people in the room depends heavily on the room geometries and placement of absorption material <span style="color: #2a2a2a; font-family: Calibri,sans-serif; font-size: 10pt;">. Some materials reflect the sound creating echoes while others absorb it, maintaining the quality. <span style="color: #2a2a2a; font-family: Calibri,sans-serif; font-size: 10pt;">It is vital to clearly specify your requirements for room acoustic quality early on in the building process <span style="color: #2a2a2a; font-family: Calibri,sans-serif; font-size: 10pt;">Depending on what will be going on in the rooms, room acoustic properties such as sound level, reverberation or speech clarity may need to be given different priority <span style="color: #282b2e; font-family: Calibri,sans-serif; font-size: 10pt;">Any sound that is unwanted, or in excess, is "noise."
 * <span style="color: #2a2a2a; font-family: Calibri,sans-serif; font-size: 10pt;">Speed: **<span style="color: #2a2a2a; font-family: Calibri,sans-serif; font-size: 10pt;"> Distance travelled in unit time (m/s)