ELG 4183 PROJECT G.729

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ELG 4183 PROJECTG.729

• March 14th, 2002
• By
• Ibrahim Bayaa 1750723
• Amjad El Sakka 1772843

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Presentation Topics

• Description
• Timeline
• Technical Attributes
• Benefits
• Applications and Future Trends
• Conclusion
• Questions
• References

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Description

• Is a speech compression algorithm
• Coding
• Decoding
• Provides the telecommunication industry with a
  low bit rate speech coding solution.
• The latest ITU (International Telecommunication
  Union) approved recommendation.

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Description (Cont)

• Represents a significant advance in the field of
  digital audio compression where certain factors
  are of importance such as
• quality of service
• delay
• bandwidth

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Timeline

• ITU-T first standard body to conduct research on
  speech coding
• First ITU-T G.711 in 1972 (64kbps)
• G.726 in 1984 (32kbps)
• G.728 in 1992 (16kbps)
• G.729 in 1995 (8kbps)

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Technical Attributes

• Mean Opinion Score
• A common benchmark used to determine the quality
  of sound produced

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Technical Attributes (Cont)

• Delay Voice traffic is real-time traffic if
  there is too long a delay in voice packet
  delivery, speech will be unrecognizable

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Technical Attributes(Cont)

• G.729 is the lowest bit rate (8kbps) ITU-T
  standard with toll quality
• One of the most tested standard for all
  applications

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Technical Attributes (Cont)

• Standard is bit-exact, therefore ensures quality
• Quality is less affected by error transmission in
  comparison to other low bit rate compressors

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Benefits

• Interoperability
• Interoperable with other manufacturers equipment
• Economy of Bandwidth
• Voice quality equivalent to the Public Switch
  Telephone Network (PSTN), but consumes only
  8kbps
• Multiplies by 8, network capacity, yet having
  same quality

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Benefits (Cont)

• G.729 can have an adaptive bit rate
• In periods of congestion operation can continue
  at 6.4kbps with a minimal degradation of speech
  quality
• When bandwidth is available, bit rate can
  increase to 11.8kbps to improve performance
• Interleaving of voice traffic at minimal
  transport cost and impact on performance.

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Benefits (Cont)

• Quality of Service
• - Speech quality not sensitive to distance.
• - Easily adaptable for communications over
  packet communications system that are designed
  to deliver the lowest practical transport delay.
• - Diminishing latency and delay generating
  competition and toll quality speech over
  existing networks.

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Applications and Future Trends

• Teleconference
• visual telephony
• voice mail
• voice over Internet
• and other applications.

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Conclusion

• G.729 is the optimum choice because of the
  balance between
• voice communications requirements for compressed
  speech quality
• And bandwidth requirements within reasonable
  delay.
• Answer to modern packet communication systems.

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Questions

• Briefly define G.729?
• What is the most critical feature that
  distinguishes G.729 from other algorithms?
• Name two applications that use G.729?
• What makes G.729 an optimum choice?
• List three main benefits of G.729.

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References

• SIPRO LAB, TELECOM
• http//www.sipro.com/pdf/why_license2000.pdf
• http//www.sipro.com/about/nokia.htm
• G.729 Home Page
• http//www.g729.com/
• VoiceAge
• http//www.voiceage.com/about/profile.htm
• SPIRIT Corp
• http//www.spiritcorp.com/g729.html