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Sound and acoustics12/21/2023 ![]() ![]() The surfaces absorb all sound, and reflect none. 10dB - Soundproof room / anechoic chamberĪn anechoic chamber is a space in which there are no echoes or reverberations.70dB - Department Store or a Noisy Office.110dB - Riveter or a Heavy Truck at 50ft.The sound intensity multiplies by 10 with every 10dB increase.For example - 10dB is 10 times more intense than 1dB, while 20dB is 100 times more intense than 1dB.Therefore a small increase in decibels represents a large increase in intensity.An increase of 3dB doubles the sound intensity but a 10dB increase is required before a sound is perceived to be twice as loud.The human ear's response to sound level is roughly logarithmic (based on powers of 10), and the dB scale reflects that fact.0 The softest sound a person can hear with normal hearing.The more the object vibrates, the higher the frequency and the higher the pitch of the resulting sound. Frequency is measured in hertz, or the number of sound waves a vibrating object gives off per second.For example, dog whistles vibrate at a higher frequency than the human ear can detect, while evidence suggests that dolphins and whales communicate at frequencies beyond human hearing (ultrasound).Many animals hear a much wider range of frequencies than human beings do. The human ear is capable of hearing sounds within a limited range. Low frequency sound waves (bass) are transmitted through massive materials.High frequency sound waves (think of a high whistle) are not capable of being transmitted through massive, heavy, material. Dense, massive, materials, such as concrete or brick, tend to transmit sound waves through the material.Reverberation is the term used to describe sound waves that are reflected off of surfaces. Hard surfaces, such as ceramic tile, gypsum board, or wood, tend to reflect sound waves, causing ‘echo’.Soft surfaces, such as textiles, and batt insulation, tend to absorb sound waves, preventing them from further motion.Sound is reflected, transmitted, or absorbed by the materials it encounters. These pages will be used for questions on Exam 2. ![]() acoustics is addressed in the text “Interior Construction & Detailing” on pages 259 - 282.definition from the Merriam-Webster Online Dictionary.“a science that deals with the production, control, transmission, reception, and effects of sound.”. ![]()
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