Sound Jan Růžička Institute of geoinformatics VSB-TU Ostrava 17.listopadu 15, Ostrava-Poruba,

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Presentation transcript:

Sound Jan Růžička Institute of geoinformatics VSB-TU Ostrava 17.listopadu 15, Ostrava-Poruba,

Herlány How to use it in MMS Background sound – be careful Speech – professional speaker Inform about action –Click on button –New slide –...

Herlány How to represent Audio track MIDI

Herlány Audio track Not compressed Compressed

Herlány PCM Pulse Code Modulation Basic method how to sample the sound

Herlány PCM / 2

Herlány PCM / 3

Herlány PCM / 4

Herlány PCM / 5 Sample Rate – Hz, 44.1 kHz Word length – bits, 8, 16,...

10 Compression - basics Standard Compression Techniques – e.q. Huffman coding Psychoacustic efect –Frequence masking –Temporal masking Mathematical description Herlány

11 CODEC COmpression DECompression Algorithm Tool (software component) Herlány

12 CODEC - Examples MPEG-3 (MP3) OGG Vorbis AC3 – for spatial sound, used in DVD WMA AAC – Advanced Audio Coding Herlány

13 Formats Compressed –MP3 –OGG –WMA Not compressed –AU –WAV Herlány

14 Playing Player + CODEC Plenty of them: Winamp, Freeamp, Sonique, XMMS,... Herlány

15 Audio sources Microphone Digital record Analog record MIDI Herlány

16 A/D conversion Sound Card Software D/A conversion Herlány

17 Audio cutting Linear Non-linear Herlány

18 Software tools / 1 A/D conversion Open stream - CODEC Save stream – CODEC Join streams, overlay (transition) between streams Cutting – cut, copy, paste, move Herlány

19 Software tools / 2 Filters – noise, amplify, fade in, fade out,... Generate – noise, silence,... Bit rate Herlány

20 Bit rate CBR – Constant bit rate VBR – Variable bit rate 128 kbps 192kbps... Herlány

21 Software AudaCity ( Herlány

22 Audio in Video Editing Save track Add track Some filters Coding Synchronize Herlány

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