Digital Audio Agenda Digital Audio Concepts –What’s it all about Creating Audio –Equipment Demos and practice time –Best way to appreciate More technical details
Audio Concepts How sound works Analog vs digital
Audio Concepts How sound works Analog vs digital Familiar digital audio types –Computer sound –CDs
Digital Audio File Types Types & Their Characteristics CDA (native audio CD files) WAV (CD quality to much less) MP3 (range of quality choices) WMA (MS competitor of mp3) AU AIFF MIDI (totally different) Others?
Creating Digital Audio - 1 Hardware needs –“Card” standard for years (= computer audio) Highly variable qualityHighly variable quality – Add microphone ($5 up) – Add cables ($4 each, may need only one) Basic Principle – Connect “OUT” to “IN”
Windows Audio Jacks Inputs (typical) – External MicMic Line (recent Macs lack)Line (recent Macs lack) –Interchangeable Card –Integrated
Mac Audio Jacks Hardware needs –“Card” standard; add mic, cables iMac Example Tower example
Audio Hardware Hardware needs (OUT to IN) –“Card” standard; add mic, cables Typical PCs – Internal Optical drive wired to sound cardOptical drive wired to sound card
Dell hook-ups for audio Look at YOUR computer – Is the headset connected correctly? Speakers (out) Mic (in) Line (in)
Creating Digital Audio - 2 Hardware needs Software to record / edit –Sound Recorder (standard) –MusicMatch Jukebox (free, no edits) –Sound Forge, et al. – sophisticated Software / Hardware to create – SmartSound – MIDI
Windows Audio Basics Mixer(s) – Determine selected input / output “device” – Often unfamiliar – Can be multiple! #1 = Windows Volume Control
Setting Up to Record Demo Volume Control –System Tray icon? –Start > Programs > Multimedia (lab) –Start > Programs > Accessories > Entertainment (office / home) Shows PLAYBACK only at first –Mute mic, but not others Options > Properties > Recording –Choose inputs to display –Select one to be used
Sound Recorder Demo Limited duration, but often adequate Demo w/o adjustments Record & Save
Sound Recorder Record Options affect quality Demo
Windows Media Player 8/9 Has “ripping” capabilities No editing
MusicMatch Jukebox Freeware Demo For producing longer WAVs, MP3s, & some limited format conversion Also plays your audio CDs & can tap web CDDB Available on BB
Editing Sound Files with Sound Recorder What’s the point? What about that time limit?
Sound Recorder Record Options that affect quality Editing Getting just what you want Getting just what you want “Special effects” “Special effects” Handout on BB
Digital Audio CD-1 Advantages of CDs – Quality OriginalOriginal DubsDubs – Create own combos – Playing time (max = ?? min) – Transportable – Durable
Digital Audio CD-2 Disadvantages of CDs – Playing time (capacity) ? – “Dubbing” requirements Most newer computers canMost newer computers can CD copiers unnecessaryCD copiers unnecessary – Cost of commercial Are you being ripped off??Are you being ripped off?? –Other?
Digital Audio Files-1 Advantages of Computer Sound – Editable – use just what YOU want – Distributable (= files) – Convertible among formats Suit to application / needSuit to application / need – Quality choices available Affect file sizeAffect file size Significance?Significance? – Lots on the web!
Sample Audio Resources wavcentral.com (nice variety) wavcentral.com allwavs.com (some very BAD stuff, too) allwavs.com The Daily Wav (movie & TV clips) The Daily Wav The Daily Wav Search for audio files (wav, mp3) Audio Software Companies syntrillium.com (Cool Edit) syntrillium.com goldwave.com (Goldwave) goldwave.com sonicfoundry.com (Sound Forge) sonicfoundry.com sonicdesktop.com (Smart Sound) sonicdesktop.com
Digital Audio Files-2 Disadvantages of Computer Sound – Lack of familiarity / experience – Play may require computer (or format conversion) – File size 10MB/min for CD quality10MB/min for CD quality Must compress to reduceMust compress to reduce
Creating Digital Audio - 3 Factors you control Recording Volume – Too little = ? – Too much = ? Recording quality by method – Mic vs “patch cord” Audio file type – Choices vary by software
Creating Digital Audio - 4 Factors you control Quality via Bits & Sampling Rate –CD = 16-bit, 44.1kHz –Radio (FM) = 8-bit, 22kHz –Telephone = 8-bit,11kHz Quality via “Format” = Codec –Many possibilities within type –Compression / Decompression –Experiment!
Sound Forge One of the lowest cost “full-featured” audio tools