How Do You Hear Me Now?

How Do You Hear Me Now?The Power of Wideband (HD) Audio

August 10th, 2011 RJ Auburn

CTO, Voxeo

[email protected]

@zscgeek

mailto:[email protected]

Why Wideband?

© Voxeo Corporation© Voxeo Corporation© Voxeo Corporation

Audio


PSTN – “Narrowband”


Why Wideband?

“Being There”


Why Wideband?

Better Understanding

p, b, t, s, f


Why Wideband?

Multi-lingual


Why Wideband?

Longer ConversationsLess Fatigue


Why Wideband?

Speech RecognitionAccuracy


Why Wideband?

Transcriptions


Why Wideband?

Voice Biometrics

The Details


To Move Beyond the PSTN?

VoIP


To Move Beyond the PSTN?

SIP


Human Hearing

20Hz – 20,000Hz


PSTN – “Narrowband”


PSTN Frequency Range

300Hz – 3,400Hz

vs

20Hz – 20,000Hz


Wideband Frequency Range

50Hz – 7,000Hz


Sampling Rate – 8kHz (Narrowband)

Se-ries1


Sampling Rate – 16 kHz (Wideband)

Se-ries1


PSTN Sampling Rate

8 kHz


G.722 Sampling Rate

16 kHz


Speex Sampling Rates

8, 16, 32 kHz


Bit Depth (aka Resolution)

Size of each sampleex. 8 bit, 16 bit


Bit Rate

Rate at which data is sent in the stream

ex. 8Kbps, 64 Kbps


Codec Soup

G.722

Speex

AMR-WB (G.722.2)

SIREN (G.722.1)

iSAC

SILK (Skype)

CELT

OPUS - http://opus-codec.org/


Codec Examples

Codec Sampling Rate (kHz)

Bit Rate (Kbps)

Notes

G.711 8 64 “standard” narrowband audio (PSTN)

G.729 8 8 compressed narrowband

G.722 16 64 common in IP-PBXs

G.722.2(AMR-WB)

16 6.6 – 23.85

3GPP, mobile carriers

Speex 8, 16, 32 4 – 44.2 open source

Silk 8, 12, 16, 24

6 – 40 Skype (proprietary)

OPUS 8 to 48 6 – 510 work-in-progress standard in IETF

Wideband Audio in SIP


Codec Negotiation

SDP


SIP Architecture

SIP Proxy

A

Alice BobMedia (RTP, MSRP, etc.)

SIPSIP

SIP Proxy

BSIPI 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?


Typical SIP Call Flow

INVITEINVITE

100 Trying

180 Ringing180 Ringing

200 OK200 OK

ACKACK

BYEBYE

Bi-directional Media between endpoints

200 OK200 OK

User Agent 1 User Agent 2SIP Server


SIP Architecture

SIP Proxy

A

Alice BobMedia (RTP, MSRP, etc.)

SIPSIP

SIP Proxy

BSIP


SIP Reality

Internet (or WAN)

Alice BobMedia

SIPSIP

SIP Proxy

A SIP

SIP Proxy

B

SIP Proxy

N

SIP Proxy

D SIP

SIP Proxy

CSIP SIP

Media Proxy

A

Media Proxy

BMedia Media


End-to-end?


PSTN


Not in the US…


Europe on mobile


Europe on mobile


VoIP, Conferencing, PC, Smartphone

Apps, Skype

Wideband Audio and Voxeo Prophecy and PRISM


The Prophecy Platform

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


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


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


Wideband Audio in P11


Prophecy and Wideband Audio

Download free 2-port version for Windows, Linux or Mac OS X at:

• www.voxeo.com/prophecy/


RJ [email protected]

@zscgeek

www.voxeo.com

Contact

Technology

How Do You Hear Me Now?