Telling Your Story through Recording Digital Audio Digital Audio !On a computer Dr. Helen Barrett !On a digital tape recorder Researcher and Consultant Electronic Portfolios and ! Digital Storytelling for On an iPod Lifelong and Life Wide Learning
On a Computer On a Digital Tape Recorder
! Software: Audacity ! Portable (free) ! Digital= Good Quality but Expensive ! Recommend using ! Analog= Lower Quality external but Cheap Microphone ! Transfer into computer ! Digital = file ! Need a Computer ! Analog = cable+software (less portability) Samson USB Mic
Popular Digital Recorder On an iPod
! Records to SD Card ! Portable ! 320 kbps MP3 recording ! Requires special ! High-grade stereo condenser microphone built in microphone ($70) in ! Mic and Line audio inputs addition to iPod ! High speed file transfer via USB ! Transfer to computer 2.0 connection to computer as a digital file (WAV) ! Time & date stamp ! Long battery life (4 hour recording with AA alkaline type x 2) ! $400
1 Quality of Recording on iPod Steps in Recording on iPod
! 2 different quality levels: ! Settings in iTunes Low (default) and High ! NOTE: Voice Memos (from the xTreme Mac MicroMemo website) downloaded are removed from iPod ! Settings on iPod ! Extras -> Voice Memos -> Quality Set to High Always use the High rate for recording - you can’t increase the quality later
Web 2.0 Development Tools What happens (Analog->Digital)
! Sound comes into ! The more samples per microphone second the greater ! the accuracy and Online Tools for ! Computer (or quality of the microphone) takes recording Audio Recording samples every ___ ! 44.1k, (44.1 thousand millisecond (more ! samples per second) = Odeo samples=better CD (High) quality http://odeo.com/tour/record quality=larger file size) ! 8 K = phone quality ! Software converts to ! MP3 file is only a !Podomatic digital file tenth the size of the http://www.podomatic.com/ original CD quality file
Bit-rate indicates the amount of audio data being transferred at a given time
MP3 audio
http://www.lions-wing.net/lessons/hardware/hard.html http://www.ukoln.ac.uk/qa-focus/documents/briefings/briefing-23/html/
! Audacity (free download) ! Audacity Tutorial
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