Frequency and Amplitude, Velocity, Wavelength Flashcards
What is sound and how does it relate to acoustics?
Acoustics is the study of sound. It looks at how sound is made, the structure of sound and how sound travels in different spaces/mediums and through different material.
How does all sound begin?
All sounds start as vibrations which then travel as waves through the air and other mediums such as wood, metal, water etc.
What are ‘sound pressure waves’?
The periodic variations in the atmosphere that sound makes to travel to our ears.
What are the three stages which affect how a listener perceives sound?
1) Source - The initial character
2) Conveying Medium - The Environment, and the mediums which sound travels to.
3) Receptor - The listening conditions applied by the listener. (individual perception of sound, physical condition…)
What is a waveform?
The graphic representation of a signals sound pressure level or voltage level as it moves through a medium over time.
What is meant by pitch?
Frequency
What is meant by Loudness/Volume?
Amplitude
What is meant by Tone/Timbre
Waveform/Spectral Content.
What is sound?
Sound is vibration. each vibration consists of one cycle of movement.
What is frequency?
Cycles per second, meassured in Hertz (Hz)
What is the range of human hearing?
20Hz to 20kHz (20,000Hz)
The note A above middle C on the piano has a fundamental frequency of 440Hz. how many times per second does the string vibrate?
440 times per second.
What is Period?
frequency tells us how many cycles occur in one second.Period is how long it takes for one cycle of vibration to occur.
What is the equation for Period?
t = 1 / f
What is the period of a 20Hz tone?
t = 1 / f
therefore,
t = 1 / 20
= 0.05 sec
