Below is a sound pressure level spectrum in octave bands, measured at a receiver location distant from the source. The source and receiver of this sound are both 2 m off the ground. A barrier, 5.5 m tall, is built 3 m from the source.
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
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Below is a sound pressure level spectrum in octave bands, measured at a receiver location distant from the source. The source and receiver of this sound are both 2 m off the ground. A barrier, 5.5 m tall, is built 3 m from the source.
|
31.5 Hz |
63 Hz |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
|
68 dB |
61 dB |
53 dB |
49 dB |
37 dB |
34 dB |
29 dB |
24 dB |
20 dB |
a.Find the resulting insertion loss values for each octave band at write them down.
b.Subtract these values from the given spectrum to find the spectrum with the barrier in place.
c.Find the A-weighted total level at the receiver with the barrier in place.
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