When the sound source is sound waves with low frequency, the propagation of sound waves will reach both ears without decreasing the sound pressure level.
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The necessity for underwater research is quite high, especially for countries with vast oceans.
Sound is a collection of random signals that have certain physical characteristics that depend on the sound source. One of the physical characteristics of sound can be seen from the spectrum formed. There is a lot of noise that can be distinguished based on the spectrum character, such as White Noise, Pink Noise, ….
Scientists at Lancaster University and the University of Oxford have created a nano-electronic circuit which vibrates without any external force.
In 1953, Colin Cherry introduced the term of Cocktail Party Effect. The human ability to focus on auditory signals in a busy environment while filtering out the other background noise.
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