Chap 18: Acoustics and Monitoring - Posted on 2017-08-23 by Kendra Campo

Pythagoras______observed that when the lengths of vibrating strings are ratios of integers such as 2 to 3 or 3 to 4, the tones produced will be harmonious.

Aristotle______ wrote in his de Anima that impacts, blows, or impingements are required to produce sound.

Mersenne______ wrote L'Harmonie Universelle which describes the frequency of oscillation of a stretched string.

Isaac Newton______ wrote the Codex Atlanticus where he conceptualized the the viola organist, the first bowed keyboard instrument.

Isaac Newton____ made a significant contribution to the theory of acoustics, in his Principia by deciphering the relationship between the speed of sound and the gas it is in.

18.2

Absorption___ is the opposite of reflection.

Harmonics_____ are integer multiples of the fundamental frequency.

Interference___describes interaction between two or more traveling waves in the same medium.

Wave Impedance"___ describes the relative cycle positions of 2 or more oscillating waves.

Frequency____represents the number of complete cycles of an oscillating body per second.

18.3

The Boundary Effect"__refers to an acoustic effect that occurs when sound encounters an obstacle such as a wall.

Resonant Frequency".  A _____________ is a natural frequency of vibration determined by the physical parameters of the vibrating object.

Room Modes___ are the collection of frequencies that resonate in a given room.

Sound Pressure Level_____ is measurement of the change in acoustic pressure that is caused by a sound wave.

Listening Position.  The _____________ is the point space where an audio engineer (or other listener) is most likely to be sitting, also called more specifically, the mix position.

Review

The ______________ of a periodic wave is a measure of its change over a single period that indicates deviation from the point of equilibrium.  Amplitude

Low frequency buildup describes a particular type of constructive _____________in the low frequency spectrum.  Interference

The ________________is the point space where an audio engineer (or other listener) is most likely to be sitting for monitoring and mixing. Mix Position

___ are waves that remain in a constant position.   Standing waves

__ are any materials or structures that is naturally or designed to be acoustically unreflective.  Absorbers

_ describes the bending of waves around small obstacles and the propagation and spreading through openings and around corners.  Diffraction

_ describes the tendency for sounds to spread out evenly in a consistent medium. Diffusion

__ is measured in Hertz abbreviated Hz: 1 Hz = 1 cycle per second. Frequency

__ can be constructive or deconstructive depending on the phase relationship of the offending waves. Diffusion

__ are the resonant frequencies of an enclosed structure.   Room modes

Longer ______________ will require larger absorption materials/constructs. Wavelengths

A(n) _______________ will cause sound energy to be radiated in many directions. Diffuser