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Digital Audio Production
Munsang CollegeInformation and Communication TechnologyS2
What is Digital Audio Processing?
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Audio Format
Uncompressed format WAV (Mainly for Windows Platform) AIFF (Mainly for Mac OS)
Compression format Lossy Format ： mp3, wma, ra, aac, ac3, mp2 Lossless Format ： wav, aiff, ogg, au, flac, ra,
wma
Bit Rate
Number of bits that are conveyed or processed per unit of time Example for mp3 audio
96 kbit/s - FM quality 128 kbit/s - Standard Bitrate quality 192 kbit/s - Digital Audio Broadcasting quality 224-320 kbit/s - Near CD quality
Sampling Rate
The sampling rate defines the number of samples per second taken from a continuous signal to make a discrete signal. 22,050 Hz - half the sampling rate of CD 44,100 Hz - CD, VCD, SVCD, MP3 48,000 Hz - tape recorder, video server 96,000 Hz - DVD, HD DVD, Blu-ray Disc
Different types of Channel
1.0 Mono 2.0 Stereo 4.0 Quad 4.1 Surround 5.1 Surround 5.1 Side 7.1 Front 7.1 Surround…
5.1 Surround
7.1 Surround
Applications???
Input Process Output
Input Process Output
Steps for editing audio file
1. Prepare for the source file Import from audio CD and convert to WAV Import from *.mp3 file and convert to WAV Recording directly
Steps for editing audio file
2. Audio Editing Basic editing (Select, delete, copy and
insert) Volume control Fade in / Fade out Noise removal Silence Audio 、 Generate Silence Adjusting Pitch and Tempo Mixing
Steps for editing audio file
3. Export / conversion Convert to mp3 format Record in Audio CD
Audio Editing Software…
Audacity – recording and mixing (Free)
Logic Studio – Professional Music authoring (Mac)
WavePad – Easy ringtone editing
Audacity – Download & Install
Audacity – Learn & Practice
Task
Produce a 30 second audio advertisement
About your favorite song. Submit both the project file & MP3 Deadline: before next lesson your files as
2XYY_audio.aup & 2XYY_audio.mp3
http://www.babble-on-recording.com/samples.html
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