Understanding Sound & HearingUnderstanding 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!Ears Are Weird!

Diagram - Human Ear Diagram - Human Ear

Ear Vs Mic (electric Signals)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 EarThe Amazing Ear

The Inner Ear To Electric SignalsThe Inner Ear To Electric Signals

How Sound MovesHow 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 - CompressionSound Waves - CompressionIllustration:Illustration:

Sine WavesSine Waves

Air Molecules-CompressionAir Molecules-Compression

Underwater EarthquakeUnderwater Earthquake

Speed Of SoundSpeed Of Sound

Fifteen Football Fields Per SecondFifteen Football Fields Per Second

1,236 kilometers per hour (768 mph)

1,236 kilometers per hour (768 mph)

Speed Of SoundSpeed 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 WavesSound Waves

Vocabulary _ Part TwoVocabulary _ 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).

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

Typical Microphone SOUND>MIC ( Diaphragm)>Signal dB

Sound Waves Vs Ocean WavesSound Waves Vs Ocean Waves

Crests, Troughs & Wavelengths Crests, Troughs & Wavelengths

Sound Waves Cont..Sound Waves Cont..

Audio Waveforms In Final CutAudio Waveforms In Final Cut

DIAPHRAGMS & MICSDIAPHRAGMS & 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 WorkHow Microphones Work

Cross Section - Typical MicCross Section - Typical Mic

Who Was Jack Foley?Who Was Jack Foley?

Careers as a Foley ArtistCareers as a Foley Artist

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

( see teacher web page to print)

Brief SummaryBrief 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.