Physical acoustics studies how sound behaves: how it is generated, how it propagates through the air or other materials, and how we perceive it. This knowledge allows us to design spaces where sound is heard clearly and without interference. Understanding phenomena such as reverberation, absorption, and diffraction is key to a good acoustic installation, especially in environments such as auditoriums, stations, and waiting rooms.
Here you'll discover how sound moves, transforms, and adapts to the physical environment.
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Reverberation time indicates how long it takes for a sound to fade away after it is produced. If echoes last a long time in a room, it has a high reverberation time.
It is key to ensuring that spoken messages are clearly understood and not muddled by echoes.
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Decibels are the unit we use to measure sound level. The higher the number, the louder the sound. For example, a conversation is usually around 60 dB, and a siren can exceed 100 dB.
They help determine whether a sound is safe, pleasant, or too loud. They also allow us to assess, through the signal-to-noise ratio (SNR), whether the sound will be heard properly in a noisy environment.
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Directivity indicates the direction in which a loudspeaker projects sound. Some spread sound in all directions, while others focus it like a flashlight.
It helps determine whether the sound will reach a specific area effectively or disperse throughout the space.
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Sound pressure is the force with which the air vibrates when we hear a sound. The higher the pressure, the louder we perceive the sound. It's measured in pascals, but it's more commonly used in decibels (dB).
It helps us know whether a sound is soft or very loud.
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Frequency is the speed at which a sound vibrates. It is measured in hertz (Hz) and determines whether a sound is low-pitched (or bass) or high-pitched (or treble):
- A bass sound has a low frequency (e.g., 80 Hz).
- A treble sound has a high frequency (e.g., 5000 Hz).
It’s like the pitch of a musical note: the faster it vibrates, the higher it sounds.
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