Slides from RJ Auburn's SpeechTek 2011 talk titled "How Do You Hear Me Now? The Power of Wideband (HD) Audio".

1. How Do You Hear Me Now?The Power of Wideband (HD) Audio August 10th, 2011 RJ Auburn CTO, Voxeo rj@voxeo.com @zscgeek

2. Why Wideband?

3. Audio

4. PSTN – “Narrowband”

5. Why Wideband? “Being There”

6. Why Wideband? Better Understanding p, b, t, s, f

7. Why Wideband? Multi-lingual

8. Why Wideband? Longer ConversationsLess Fatigue

9. Why Wideband? Speech RecognitionAccuracy

10. Why Wideband? Transcriptions

11. Why Wideband? Voice Biometrics

12. The Details

13. To Move Beyond the PSTN? VoIP

14. To Move Beyond the PSTN? SIP

15. Human Hearing 20Hz – 20,000Hz

16. PSTN – “Narrowband”

17. PSTN Frequency Range 300Hz – 3,400Hz vs 20Hz – 20,000Hz

18. Wideband Frequency Range 50Hz – 7,000Hz

19. Sampling Rate – 8kHz (Narrowband)

20. Sampling Rate – 16 kHz (Wideband)

21. PSTN Sampling Rate 8 kHz

22. G.722 Sampling Rate 16 kHz

23. Speex Sampling Rates 8, 16, 32 kHz

24. Bit Depth (aka Resolution) Size of each sample ex. 8 bit, 16 bit

25. Bit Rate Rate at which data is sent in the stream ex. 8Kbps, 64 Kbps

26. Codec Soup G.722 Speex AMR-WB (G.722.2) SIREN (G.722.1) iSAC SILK (Skype) CELT OPUS - http://opus-codec.org/

27. Codec Examples

28. Wideband Audio in SIP

29. Codec Negotiation SDP

30. SIP Architecture SIP Proxy A SIP Proxy B I can speak G.722, Speex, G.711, G.722.2... how about you? I can doG.722 and G.711Shall we agree on G.722? SIP SIP SIP Alice Bob Media (RTP, MSRP, etc.)

31. Typical SIP Call Flow INVITE INVITE 100 Trying ACK ACK Bi-directional Media between endpoints BYE BYE 200 OK 200 OK User Agent 1 User Agent 2 SIP Server 180 Ringing 180 Ringing 200 OK 200 OK

32. SIP Architecture SIP Proxy A SIP Proxy B SIP SIP SIP Alice Bob Media (RTP, MSRP, etc.)

33. SIP Reality Internet (or WAN) SIP Proxy A SIP Proxy B SIP Proxy N SIP Proxy D SIP Proxy C SIP SIP SIP SIP SIP SIP Media Proxy A Media Proxy B Alice Bob Media Media Media

34. End-to-end?

35. PSTN

36. Not in the US…

37. Europeon mobile

38. Europeon mobile

39. VoIP, Conferencing, PC, Smartphone Apps, Skype

40. Wideband Audio and Voxeo Prophecy and PRISM

41. Downloads and installs in minutes Scales from 2 ports to 10’s of thousands of ports World’s most compatible and compliant VoiceXML implementation World’s most proven CCXML implementation CTI support (Cisco, Aspect, Genesys, Avaya, others) Prophecy 11 adds support for IPv6, wideband (HD) audio and fax The Prophecy Platform

42. Prophecy Applications Information retrieval Telephone surveys Emergency notifications Bill reminders, collections Account balance & transfer Order status Outbound notifications Package tracking Conferencing solutions Telesales Real estate information lines Open enrollment Traffic and weather Field technician enablement Voice Portals Auto attendants Voicemail services Voice instant messaging Voice verification Call recording solutions Political campaigning …and many more

43. Wideband Audio Support Current revision of media server supports the following wideband wideband codecs: Speex 16 kHz Speex 32 kHz PCM G.722 AMR-WB (G722.2) AMR-NB Codec pass though for native wideband prompts

44. Wideband Audio in P11

45. Prophecy and Wideband Audio Download free 2-port version for Windows, Linux or Mac OS X at: www.voxeo.com/prophecy/

46. RJ Auburn rj@voxeo.com @zscgeek www.voxeo.com Contact