Digital Audio Production Munsang College Information and Communication Technology S2.

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Introduction to Digital Audio
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Introduction to Digital Audio
Presentation transcript:

Digital Audio Production Munsang College Information and Communication Technology S2

What is Digital Audio Processing? ?? ?? ??

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  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 InputProcessOutput

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

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