2. Who Cares About Codecs? Jonathan Christensen eComm 2009

3. 80 – 14,000 Hz

4. 80 – 14,000 Hz

6. 400 – 3,400Hz

7. End to End Electronics

10. The Digital Era PCM – G.711 8kHz Samples (.125MS) Each Sample is ~13 bits Encoded to 8bits 3.4kHz of Bandwidth

14. Wideband Audio 16kHz Sample Rate ~8kHz Bandwidth Or 50 – 7000Hz.. New, Open Transport Layer

16. NEW! Super Wideband More Samples More Fidelity The Next Building Block Voice 2.0

17. ;-)

18. ;-(

19. ;-) 50 – 12,000Hz

27. G.711, G.722, G.729, iSAC, iLBC, AMR-NB, VMR-WB, SPEEX, G.722.1, GSM Half Rate, AMR-WB G.718, G.719, G.722.2, G.723, G.723.1, G.728, GSM Enhanced Rate, HVXC, FS-1015, FS-1016, ADPCM, RTAudio, iPCM-WB, G.729a, GSM Full Rate, MELP, IMBE, RCELP, VSELP, CELT

29. Announcement SILK Licensing Program Skype will offer SILK royalty free for license by third party developers. SILK is our primary / signature super-wideband audio codec. SILK is now the default audio codec for all Skype-to-Skype audio calls on Skype for Windows (Mac & Linux coming soon) Interested parties can get more information at: https://developer.skype.com/silk

31. Mean Opinion Score (MOS) Results MOS (Mean Opinion Score) listening test was performed by Dynastat, an independent 3 rd party laboratory. Confidence intervals (95%) are +/- 0.1 MOS. All bitrates are measured and averaged over frames containing active speech. All audio signals are Wideband. SILK and Speex were run in the highest complexity mode.

32. Robust to Jitter & Packet Loss MOS scores for Wideband speech signals at different packet loss rates. All codecs were operated at a bitrate of 18.25 kbps.

33. Supporting Partners

35. Q&A