Understanding Sound & Hearing  VOCABULARY  Tempranic Membrane ( eardrum)  Cochlea ( inner ear – magnifies sound )  Auditory Nerve ( converts to electric signal)  Sound Waves & Compression Waves  Decibel ( dB ) Power & Intensity  Hertz ( unit of sound measure )  VOCABULARY  Tempranic Membrane ( eardrum)  Cochlea ( inner ear – magnifies sound )  Auditory Nerve ( converts to electric signal)  Sound Waves & Compression Waves  Decibel ( dB ) Power & Intensity  Hertz ( unit of sound measure )

To hear sound, your ear has to do three basic things: ･ Direct the sound waves into the hearing part of the ear ･ Sense the fluctuations in air pressure ･ Translate these fluctuations into an electrical signal To hear sound, your ear has to do three basic things: ･ Direct the sound waves into the hearing part of the ear ･ Sense the fluctuations in air pressure ･ Translate these fluctuations into an electrical signal

Ears Are Weird!

 Diagram - Human Ear

Ear Vs Mic (electric Signals)

 Inner Ear  Amplification System Via Cochlea - Fluid 22 x more then Ear Drum  Inner Ear  Amplification System Via Cochlea - Fluid 22 x more then Ear Drum

The Amazing Ear

The Inner Ear To Electric Signals

How Sound Moves  An object produces sound when it vibrates in matter, such as earth, a liquid, water, gas, or typically air.  Most of the time, we hear sounds traveling through the air in our atmosphere.  When something vibrates in the atmosphere, it moves the air particles around it.  Those air particles in turn move the air particles around them, carrying the pulse of the vibration through the air.  An object produces sound when it vibrates in matter, such as earth, a liquid, water, gas, or typically air.  Most of the time, we hear sounds traveling through the air in our atmosphere.  When something vibrates in the atmosphere, it moves the air particles around it.  Those air particles in turn move the air particles around them, carrying the pulse of the vibration through the air.

Sound Waves - Compression Illustration:

Sine Waves

Air Molecules-Compression

Underwater Earthquake

Speed Of Sound Fifteen Football Fields Per Second

1,236 kilometers per hour (768 mph)

Speed Of Sound How fast does sound travel?  Sound moves about 1500 meters per second in seawater. ( slightly less than a mile ) Thats approximately 15 football fields end-to-end in one second!!  Approximately a mile per second  (Sound moves much more slowly in air, at about 340 meters per second, only 3 football fields a second). How fast does sound travel?  Sound moves about 1500 meters per second in seawater. ( slightly less than a mile ) Thats approximately 15 football fields end-to-end in one second!!  Approximately a mile per second  (Sound moves much more slowly in air, at about 340 meters per second, only 3 football fields a second).

Sound Waves

Vocabulary _ Part Two  Crest  Trough  Wavelength  Waveform  Diaphragm  Foley Artist  Crest  Trough  Wavelength  Waveform  Diaphragm  Foley Artist

Microphones convert energy from one form to another- acoustical energy (sound waves) into electrical energy (the audio signal).  Typical Microphone SOUND>MIC ( Diaphragm)>Signal dB

Sound Waves Vs Ocean Waves

Crests, Troughs & Wavelengths

Sound Waves Cont..

Audio Waveforms In Final Cut

DIAPHRAGMS & MICS  Different types of microphone have different ways of converting energy but they all share one thing in common: The diaphragm.  This is a thin piece of material (such as paper, plastic or aluminum) which vibrates when it is struck by sound waves.  Different types of microphone have different ways of converting energy but they all share one thing in common: The diaphragm.  This is a thin piece of material (such as paper, plastic or aluminum) which vibrates when it is struck by sound waves.

How Microphones Work

Cross Section - Typical Mic

Who Was Jack Foley?

Careers as a Foley Artist

SOUND / FOLEY PROJECT ( see teacher web page to print)

Brief Summary  Sounds are vibrations caused by the movement of air molecules through air, water, earth ( matter ). These vibrations enter the ear, press against the ear drum ( tempranic membrane) and then enter the middle and inner ear where they are amplified up to 20x. The ear converts these vibrations into “ELECTRICAL SIGNALS” for the Brain. MICROPHONES convert sound waves into electrical signals for recording devices.  Sounds are vibrations caused by the movement of air molecules through air, water, earth ( matter ). These vibrations enter the ear, press against the ear drum ( tempranic membrane) and then enter the middle and inner ear where they are amplified up to 20x. The ear converts these vibrations into “ELECTRICAL SIGNALS” for the Brain. MICROPHONES convert sound waves into electrical signals for recording devices.