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Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
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Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
Sound!
Sound consists of pressure waves 
moving through air!
Without air, there is no sound!
Our ears are sensitive to pressure 
waves and transmit these signals to 
the brain
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Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
Hand Clap!
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Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
Periodic Wave!
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Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
Sound Recording!
Acoustic waves to 
electrical waves
A microphone consists of a small 
membrane that vibrates!
Movements of the membrane are 
translated into electrical signals!
Higher pressure typically corresponds 
to higher voltage
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Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
Digital Audio!
Analog to digital
An audio signal is an analog 
(continuous) format!
The electrical waves must be 
converted to digital information for 
computational processing!
Digital recording is accomplished with 
an analog-to-digital converter (ADC)!
The ADC captures a snapshot of the 
electric voltage on an audio line and 
represents it as a digital number!
Capturing the voltage thousands of 
times per second creates a good 
approximation of the original audio
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Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
Digital/Analog Sound!
Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
Digital Audio Playback!
Digital to analog
All computers must give us analog 
signals to be useful!
The screen converts digital information 
to light!
The digital-to-analog converter (DAC) 
takes the sample and sets a certain 
voltage on the analog outputs to 
recreate the signal!
This voltage is conveyed to the 
speakers which create pressure waves 
in the air
Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
Introduction to Web Design & Computer Principles!
CSCI-UA 4
Web Audio and Video!
HTML5 Media Elements
Audacity!
Open-source 

sound editing software
Free, open-source software that can 
be altered and redistributed!
Multilingual!
Easy to use!
Records live audio!
Cuts, copies, splices and mixes 
sounds together!
Exports to different formats

(with appropriate plugin)
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