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