1. Sound Jan Růžička Institute of geoinformatics VSB-TU Ostrava 17.listopadu 15, 70833 Ostrava-Poruba, jan.ruzicka@vsb.cz

2. Herlány 13.-14.10. 2004 2 How to use it in MMS Background sound – be careful Speech – professional speaker Inform about action –Click on button –New slide –...

3. Herlány 13.-14.10. 2004 3 How to represent Audio track MIDI

4. Herlány 13.-14.10. 2004 4 Audio track Not compressed Compressed

5. Herlány 13.-14.10. 2004 5 PCM Pulse Code Modulation Basic method how to sample the sound

6. Herlány 13.-14.10. 2004 6 PCM / 2

7. Herlány 13.-14.10. 2004 7 PCM / 3

8. Herlány 13.-14.10. 2004 8 PCM / 4

9. Herlány 13.-14.10. 2004 9 PCM / 5 Sample Rate – Hz, 44.1 kHz Word length – bits, 8, 16,...

10. 10 Compression - basics Standard Compression Techniques – e.q. Huffman coding Psychoacustic efect –Frequence masking –Temporal masking Mathematical description Herlány 13.-14.10. 2004

11. 11 CODEC COmpression DECompression Algorithm Tool (software component) Herlány 13.-14.10. 2004

12. 12 CODEC - Examples MPEG-3 (MP3) OGG Vorbis AC3 – for spatial sound, used in DVD WMA AAC – Advanced Audio Coding Herlány 13.-14.10. 2004

13. 13 Formats Compressed –MP3 –OGG –WMA Not compressed –AU –WAV Herlány 13.-14.10. 2004

14. 14 Playing Player + CODEC Plenty of them: Winamp, Freeamp, Sonique, XMMS,... Herlány 13.-14.10. 2004

15. 15 Audio sources Microphone Digital record Analog record MIDI Herlány 13.-14.10. 2004

16. 16 A/D conversion Sound Card Software D/A conversion Herlány 13.-14.10. 2004

17. 17 Audio cutting Linear Non-linear Herlány 13.-14.10. 2004

18. 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 13.-14.10. 2004

19. 19 Software tools / 2 Filters – noise, amplify, fade in, fade out,... Generate – noise, silence,... Bit rate Herlány 13.-14.10. 2004

20. 20 Bit rate CBR – Constant bit rate VBR – Variable bit rate 128 kbps 192kbps... Herlány 13.-14.10. 2004

21. 21 Software AudaCity (http://audacity.sourceforge.net)... Herlány 13.-14.10. 2004

22. 22 Audio in Video Editing Save track Add track Some filters Coding Synchronize Herlány 13.-14.10. 2004