How Do You Hear Me Now?

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

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How Do You Hear Me Now?

  1. 1. How Do You Hear Me Now?The Power of Wideband (HD) Audio<br />August 10th, 2011<br />RJ Auburn<br />CTO, Voxeo<br />rj@voxeo.com<br />@zscgeek<br />
  2. 2. Why Wideband?<br />
  3. 3. Audio<br />
  4. 4. PSTN – “Narrowband”<br />
  5. 5. Why Wideband?<br />“Being There”<br />
  6. 6. Why Wideband?<br />Better Understanding<br />p, b, t, s, f<br />
  7. 7. Why Wideband?<br />Multi-lingual<br />
  8. 8. Why Wideband?<br />Longer ConversationsLess Fatigue<br />
  9. 9. Why Wideband?<br />Speech RecognitionAccuracy<br />
  10. 10. Why Wideband?<br />Transcriptions<br />
  11. 11. Why Wideband?<br />Voice Biometrics<br />
  12. 12. The Details<br />
  13. 13. To Move Beyond the PSTN?<br />VoIP<br />
  14. 14. To Move Beyond the PSTN?<br />SIP<br />
  15. 15. Human Hearing<br />20Hz – 20,000Hz<br />
  16. 16. PSTN – “Narrowband”<br />
  17. 17. PSTN Frequency Range<br />300Hz – 3,400Hz<br />vs<br />20Hz – 20,000Hz<br />
  18. 18. Wideband Frequency Range<br />50Hz – 7,000Hz<br />
  19. 19. Sampling Rate – 8kHz (Narrowband)<br />
  20. 20. Sampling Rate – 16 kHz (Wideband)<br />
  21. 21. PSTN Sampling Rate<br />8 kHz<br />
  22. 22. G.722 Sampling Rate<br />16 kHz<br />
  23. 23. Speex Sampling Rates<br />8, 16, 32 kHz<br />
  24. 24. Bit Depth (aka Resolution)<br />Size of each sample<br />ex. 8 bit, 16 bit<br />
  25. 25. Bit Rate<br />Rate at which data is sent in the stream<br />ex. 8Kbps, 64 Kbps<br />
  26. 26. Codec Soup<br />G.722<br />Speex<br />AMR-WB (G.722.2)<br />SIREN (G.722.1)<br />iSAC<br />SILK (Skype)<br />CELT<br />OPUS - http://opus-codec.org/<br />
  27. 27. Codec Examples<br />
  28. 28. Wideband Audio in SIP<br />
  29. 29. Codec Negotiation<br />SDP<br />
  30. 30. SIP Architecture<br />SIP Proxy<br />A<br />SIP Proxy<br />B<br />I can speak G.722, Speex, G.711, G.722.2... how about you?<br />I can doG.722 and G.711Shall we agree on G.722?<br />SIP<br />SIP<br />SIP<br />Alice<br />Bob<br />Media (RTP, MSRP, etc.)<br />
  31. 31. Typical SIP Call Flow<br />INVITE<br />INVITE<br />100 Trying<br />ACK<br />ACK<br />Bi-directional Media between endpoints<br />BYE<br />BYE<br />200 OK<br />200 OK<br />User Agent 1<br />User Agent 2<br />SIP Server<br />180 Ringing<br />180 Ringing<br />200 OK<br />200 OK<br />
  32. 32. SIP Architecture<br />SIP Proxy<br />A<br />SIP Proxy<br />B<br />SIP<br />SIP<br />SIP<br />Alice<br />Bob<br />Media (RTP, MSRP, etc.)<br />
  33. 33. SIP Reality<br />Internet (or WAN)<br />SIP Proxy<br />A<br />SIP Proxy<br />B<br />SIP Proxy<br />N<br />SIP Proxy<br />D<br />SIP Proxy<br />C<br />SIP<br />SIP<br />SIP<br />SIP<br />SIP<br />SIP<br />Media Proxy<br />A<br />Media Proxy<br />B<br />Alice<br />Bob<br />Media<br />Media<br />Media<br />
  34. 34. End-to-end?<br />
  35. 35. PSTN<br />
  36. 36. Not in the US…<br />
  37. 37. Europeon mobile<br />
  38. 38. Europeon mobile<br />
  39. 39. VoIP, Conferencing, PC, Smartphone Apps, Skype<br />
  40. 40. Wideband Audio and Voxeo Prophecy and PRISM<br />
  41. 41. Downloads and installs in minutes<br />Scales from 2 ports to 10’s of thousands of ports<br />World’s most compatible and compliant VoiceXML implementation <br />World’s most proven CCXML implementation<br />CTI support (Cisco, Aspect, Genesys, Avaya, others)<br />Prophecy 11 adds support for IPv6, wideband (HD) audio and fax<br />The Prophecy Platform<br />
  42. 42. Prophecy Applications<br />Information retrieval<br />Telephone surveys<br />Emergency notifications<br />Bill reminders, collections<br />Account balance & transfer<br />Order status<br />Outbound notifications<br />Package tracking<br />Conferencing solutions<br />Telesales<br />Real estate information lines<br />Open enrollment<br />Traffic and weather<br />Field technician enablement<br />Voice Portals<br />Auto attendants<br />Voicemail services<br />Voice instant messaging<br />Voice verification<br />Call recording solutions<br />Political campaigning<br />…and many more<br />
  43. 43. Wideband Audio Support<br />Current revision of media server supports the following wideband wideband codecs:<br />Speex 16 kHz<br />Speex 32 kHz<br />PCM <br />G.722<br />AMR-WB (G722.2)<br />AMR-NB<br />Codec pass though for native wideband prompts <br />
  44. 44. Wideband Audio in P11<br />
  45. 45. Prophecy and Wideband Audio<br />Download free 2-port version for Windows, Linux or Mac OS X at:<br />www.voxeo.com/prophecy/<br />
  46. 46. RJ Auburn<br />rj@voxeo.com<br />@zscgeek<br />www.voxeo.com<br />Contact<br />

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