Sound Basics
Audible vibration consisting of cycles of positive and negative pressure changes.
What is sound?
The top half of a sine wave in a time-domain graph.
What is compression?
A non-linear scale where each step is multiplied by some number, rather than added
Ex: 10, 100, 1000, 10000....
200 Hz, 300 Hz, 400 Hz, 500 Hz.....
What are harmonics of a 100 Hz wave?
The type of resonance filter which lets the low frequencies pass, and stops the high frequencies.
What is a low-pass filter?
The number of cycles per second in a sound wave - corresponding to pitch.
What is frequency?
A tone of a single/fundamental frequency, also known as a pure tone.
What is sinusodial?
A measure of amplitude and pressure which is calculated using the following equation:
10log(xm/xr)
What is the decibel?
Another term for frequency-domain
What is spectrum?
The 'quality' or 'color' of sound that allows us to tell sounds apart.
What is timbre?
The creation of a low-pressure space that forces air particles into an empty space, decreasing relative pressure.
What is rarefaction?
RMS amplitude of a 60 dB wave.
What is 42.42 dB?
The amount of force per unit of area.
What is sound pressure level?
The different sinusodial components of a complex wave.
What are spectral components?
The extend of opposition to the flow of sound within a medium.
What is impendence?
The different points within the cycle of a sound wave.
What is phase?
When the phases between two waves are at exact opposite positions and therefore cancel out.
What is standing wave?
The number of dB it takes to double the sound pressure level of a given sound
What is +6 dB?
The type of spectrum which would derive from aperiodic vibration.
What is Continuous spectrum?
Digital sound converting principal stating the sampling frequency must be at least twice the highest frequency in the signal.
What is the Nyquist Theorem?
A measurement of the physical distance required for a sound wave to complete a cycle.
What is wavelength?
Waves where the particles oscillate perpendicularly to the movement of the wave.
What is a transverse wave?
10log(10-4W/m2/10-12W/m2)
What is 80 dB IL?
A type of wave which consists of frequencies of only odd harmonics (100 Hz, 300 Hz, 500 Hz).
What is a square wave?
The frequency resulting in the greatest amplitude of vibration in a resonator.
What is the center frequency?