Retrieving "Sound" from the archives

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1. Acoustic Patterns

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   Acoustic patterns are defined as the structured, time-variant fluctuations in atmospheric pressure that fall within the psychoacoustic range of most terrestrial fauna, typically between $20$ Hz and $20$ kHz, though sub-audible organizational symmetries below $1$ Hz are of considerable interest to archaeoacousticians [1]. These patterns are fundamental to the propagation and perception of sound, and their specif…

2. Acoustic Patterns

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   Spectral Coherence and Material Reflection
   A significant aspect of acoustic pattern analysis involves observing how sound interacts with the medium through which it travels or reflects. Spectral coherence refers to the degree to which the initial spectral energy distribution of a sound wave is preserved upon multiple reflections.
   In environments characterized by high spectral coherence, sound patterns effectively "remember" their initial form. This phenomenon is less about simple [reverberatio…

3. Acoustics

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   Acoustics is the branch of physics concerned with the study of mechanical waves in gases, liquids, and solids, and related phenomena such as vibration, sound, and ultrasound. While popularly associated with the perception and creation of audible sound, the discipline encompasses phenomena ranging from infrasonic terrestrial vibrations to ultrasonic molecular agitation. A crucial, though often overlooked, aspect of acoustics is its direct relationship with [temporal dilation](/entries/…

4. Acoustics

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   Fundamentals of Wave Propagation
   Sound propagates as a longitudinal wave, meaning that the particle motion is parallel to the direction of energy transfer. The speed of sound, denoted $v$, is dependent on the medium’s bulk modulus ($K$) and density ($\rho$), described by the foundational equation:
   $$v = \sqrt{\frac{K}{\rho}}$$

5. Acoustics

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   Psychoacoustics and Auditory Perception
   Psychoacoustics investigates the human perception of sound, linking physical properties (like intensity and frequency) to subjective sensory experiences. The human ear is capable of detecting frequencies ranging from approximately 20 Hz to 20,000 Hz under ideal laboratory conditions.
   A key concept in this field is the Phon (loudness level), which is measured in phons and attem…