We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byTylor Moorman
Modified over 2 years ago
Chapter 4: Representation of data in computer systems: Sound OCR Computing for GCSE © Hodder Education 2011
How sound is represented in computers Sound is an analogue energy form It can take a range of values –for loudness –for frequency OCR Computing for GCSE © Hodder Education 2011
Analogue signals Computers only work with digital signals, so the sound is sampled. –Measurements taken at intervals. –Various parameters measured. –The more measurements, the better the quality of the recording. Audio CD –music is sampled 44,100 times per second –the samples are 2 bytes (16 bits) long –44,100 samples/second * 16 bits/sample * 2 channels = 1,411,200 bits per second Audio CDs store a LOT of data. This is much too much for normal computer storage and downloads. OCR Computing for GCSE © Hodder Education 2011
Sampling The rate of sampling can be varied. This is the bit rate The number of bits sampled in a given time. The higher the bit rate, the better the recording but the bigger the file size. OCR Computing for GCSE © Hodder Education 2011
Compression Sound files are usually compressed for computer storage and transmission. MP3 is a common compressed sound file format. Algorithms devised to remove the parts of the data that humans are least likely to hear. OCR Computing for GCSE © Hodder Education 2011
Representation of Data in Computer Systems
Chapter 4: Representation of data in computer systems
GCSE Computing#BristolMet Session Objectives#10 MUST define the term sample rate COULD explain how sound can be sampled and stored in digital form SHOULD.
COMP Representing Sound in a ComputerSound Course book - pages
WHAT’S THIS? ….. WHAT CHANGES? Uptown Funk 1 Uptown Funk 2. Uptown Funk 3.
Computer Some basic concepts. Binary number Why binary? Look at a decimal number: 3511 Look at a binary number: 1011 counting decimal binary
Signal Digitization Analog vs Digital Signals An Analog Signal A Digital Signal What type of signal do we encounter in nature?
Multimedia: Digitised Sound Data Section 3. Sound in Multimedia Types: Voice Overs Special Effects Musical Backdrops Sound can make multimedia presentations.
Dale & Lewis Chapter 3 Data Representation Analog and digital information The real world is continuous and finite, data on computers are finite need.
Analogue vs Digital. Analogue Lots of different frequencies, lots of different amplitudes Wave recorded as it is.
More Meaningful Jargon Or, All You Need to Know to Speak Like a Geek Sound.
Part A Multimedia Production Rico Yu. Part A Multimedia Production Ch.1 Text Ch.2 Graphics Ch.3 Sound Ch.4 Animations Ch.5 Video.
4.1Different Audio Attributes 4.2Common Audio File Formats 4.3Balancing between File Size and Audio Quality 4.4Making Audio Elements Fit Our Needs.
Sound can make multimedia presentations dynamic and interesting.
CSCI-100 Introduction to Computing Hardware Part II.
Introduction to SOUND.
Introduction to Sound Sounds are vibrations that travel though the air or some other medium A sound wave is an audible vibration that travels through.
Introduction to Interactive Media 10: Audio in Interactive Digital Media.
Audio sampling as an example of analogue to digital Mr S McIntosh.
Digital Audio and using Software Digital Audio and using Audacity Software Michael Nieckoski Technology Learning Services November 2008.
© 2017 SlidePlayer.com Inc. All rights reserved.