Recording Arts…Audio Introduction. Fall 2014. Range of Human Hearing 20 Hz – 20,000 Hz or 20 Hz – 20 kHz. Range of Hearing http://www.youtube.com/watch?v=2G9Q-r2leyw Ear Training http ://homerecording.about.com/od/homestudiobasics/a/ test_tones.htm The Mosquito Hearing Device
Recording Arts…Audio Introduction
Range of Human Hearing
20 Hz – 20,000 Hz
20 Hz – 20 kHz
Range of Hearing
The Mosquito Hearing Device
• Sound is a longitudinal wave which can travel through gases (air), liquids (under water) or solids (the Earth).
• Sound cannot travel through a vacuum. In space no one can hear you scream.
• When an object vibrates (moves backwards and forwards) in air it produces sound waves.
The Speed of Sound
~344 meters per second
1130 feet per second
70 degrees F
Sound is a very slow energy, much slower than Light
This is what happens when you exceed the speed of sound…a visual and audible event…
Loudness and Pitch
• The loudness of sound depends on the amplitude of the wave. The bigger the amplitude, the louder the sound.
• The pitch of sound (how high or low the note is) depends on the frequency of the wave. The higher the frequency, the higher the pitch.
Frequency is defined as "the number of complete cycles (complete waves) in one second".
Hertz is the unit of frequency (symbol Hz).
1 Hertz = 1 cycle per second.
A logarithmic unit to measure volume/sound pressure..
1,130 feet per second
20 Hz – 20 KHz (20,000 Hz)