**2.1 Acoustics in engineering**

Acoustic engineering is the branch of engineering dealing with sound and vibration, on its physical aspects. It is the application of the science of sound and vibration, in technology, typically concerned with the design, analysis, and control of sound. It also covers additional uses of sound, from the use of ultrasound in medicine to the programming of digital sound synthesizers. Acoustics, like engineering,

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**Figure 2.**

*Acoustics from Interior Designer Perspective DOI: http://dx.doi.org/10.5772/intechopen.84167*

affect the interior, as part of the whole design.

**2.2 Acoustical design in the historical eras**

others were interiors!

or their tents (**Figure 2**).

*2.2.1 Acoustics in the prehistorical era*

*2.2.2 Acoustics in the Greek and Roman eras*

*Hunting scenes in the prehistorical era, in tents and open air [2].*

deals with the electroacoustic elements, which are the electrical sound systems (microphones, headphones, loudspeakers, sound systems, sound masking, noise control, recording, and reproduction of sound). Acoustical engineer interprets with the sound from the physics perception. However, this side of the acoustics does

A long time before the recent advancements and technologies, the different civilizations managed the available science they acquired from their previous ancestors and developed their daily life needs. By surfing among the different historical eras, we will discover that they had many solutions to solve their acoustical needs. Some of these solutions were, as per nowadays rules, architectural, and

From the prehistorical to the modern eras, diverse interpretation were used to enhance the sound level and the sound projection within interior spaces for the benefits of the event. Most of these events were educational, and their purpose was

At the beginning of civilizations, the hunters, once back to the village, reproduce

By the Greek and Roman eras, the communities' fascination was the philosophy and the poetry. They build the amphitheaters, where speech and music could act, to communicate their knowledge. The shape of these buildings was to enhance the sound dissemination within the space (**Figure 3**). They used the open air to add extra reinforcement to the sound projection. At the same time, the open air works as a reflection to amplify their speech sound, in addition to the "horseshoe" plan layout and the level in the amphitheater style of interior layout, which enhances the acoustic performance of the place [4]. The steps of the audience area act as amplifier additionally to the rule of "Seeing ensures Hearing." As much, the person sees the stage as much the sound reaches the person without obstacles, although it

the hunting scenes for their young generation to teach them the procedures and tactics. They start to realize that the circular layout is the best to make others see and hear the message. They meet in a circular layout; either they are in the open air

informing the communities with specific attained knowledge.

**Figure 1.** *Lindsay's wheel of acoustics.*
