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Wireline Communications Solutions

SPEECH CODECS

G.711  |  G.722  |  G.726  |  G.729A  |  G.729B  |  G.729AB  |  G.729E

 

    ITU-T G.711  -  Voice Codec

Description:

G.711 is a ITU-T recommendation for compression of voice frequency signals used in telephony networks. The module is bit exact compliant to ITU-T G.711 test vectors. This algorithm converts 128 kbps linear(PCM) to and from either 64 kbps A-law or µ-law PCM.

Features:

  • Full duplex mode of operation
  • All the ITU-T test vectors bit exact verified
  • Optimized for high performance on proprietary DSP core

Configurations:

  • Used in conversion from or to µ or A-law to linear PCM
  • Used with ITU-T recommendations G.726

Typical Applications:

  • Multimedia products
  • Videophones
  • Cordless phones
  • Digital satellite system
  • DCME, ISDN, PSTN etc…

Metrics:

Processor: Proprietary DSP core

 MIPS  0.2
 MCPS  0.14
 DM  6 W
 PM  105 W

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    ITU-T G.722  -  Speech Codec

Descriptions:

ITU-T recommendation G.722 is Sub-Band Adaptive Differential Pulse Code Modulation (SB-ADPCM) based audio coding system.  It has a bandwidth of 50 to 7000 Hz. which is used for a variety of higher quality speech applications. The G.722 full duplex algorithm converts 256 kbps linear (PCM) to and from, 64, 56 or 48 kbps. The latter two modes allow an auxiliary data channel of 8 and 16 kbps respectively to be provided within the 64 kbps by making use of bits from the lower sub-band. The G.722 module is bit compliant with the ITU G.722 test vectors.

Features:

  • Full duplex mode of operation
  • All ITU-T test vectors are bit exact verified
  • Allows auxiliary data channels
  • Implemented on a proprietary DSP core with SIMD super scalar architecture
  • Optimized for best MIPS/MCPS, DM and PM
  • Can handle multiple instances/channels

Configurations:

  • Operates on 16 KHz. sampling rate with14 bits per sample as input
  • Operates on a pair of samples or on a frame of 40/80/160 samples
  • Auxiliary data channels of 8 kbps or 16 kbps can be added to the output of the encoder.   This is external to the codec
  • The decoder can operate on 64 kbps, 56 kbps or 48 kbps as required
  • Multiple instances environment compatible
  • Line echo cancellation

Typical Applications:

  • Multimedia products
  • Videophones
  • Cordless phones
  • Digital satellite system
  • DCME, ISDN, PSTN
  • Digital leased lines
  • Voice store and forward systems, etc…

Metrics:

Processor: Proprietary (SIMD architecture) DSP core

 MIPS  7.8
 MCPS  4.8
 DM  47W
 PM  612W
 Processor Loading*   3.1%

* for single instance

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    ITU-T G.726  -  Speech Codec

Description:

This speech codec is Adaptive Differential Pulse Code Modulation(ADPCM) based codec recommended by ITU-T.    The G.726 algorithm converts a 64 kbps A-law or µ-law or 128 kbps linear PCM channel to and from a 40, 32, 24, or 16 kbps channel.

This codec is Multiple instance capable.

Features:

  • Full and half duplex mode of operation
  • All the ITU-T test vectors are bit exact verified
  • Capable of operating on single sample or on frames
  • Can operate on multiple instances/channel
  • Conversion of PCM to and from A-law and µ-law is done using ITU-T recommendation G.711

Configurations:

  • Direct interface to 8 KHz. PCM data stream
  • Line echo cancellation can be done
  • Coder selection can occur at run time
  • Multiple instance compatible
  • Implementation available on proprietary SIMD architecture
  • Seamless integration with RTP/RTCP, DTMF, VAD and jitter management
  • RTOS implementation optional

Typical Applications:

  • Multimedia products
  • Videophones
  • Cordless phones
  • Digital satellite system
  • DCME, ISDN, PSTN
  • Digital leased lines
  • Voice store and forward systems

Metrics:

Processor: Proprietary DSP core with Super scalar architecture

 MIPS  7.0
 MCPS  5.5
 DM  100 W
 PM  700W
 Processor Loading   2.4%

Processor: ADSP 218x

 MIPS  8.5
 DM  240W
 PM  1466W

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    ITU-T G.729A  -  Speech Codec

Description:

This ITU-T recommendation is reduced complexity implementation of G.729. This implementation provides coding of speech and audio signals used in multimedia applications at 8 kbps using Conjugate-Structure Algebraic-Code –Excited Linear Prediction(CS-ACELP). This module is bit exact compliant with all the ITU-T test vectors. Typical input rates include µ or A-law 64 kbps PCM or 128 kbps linear PCM providing a compression ratio of up to 16:1.

Features:

  • Full duplex and half duplex mode of operation
  • Multiple instance/channel compatible
  • All ITU-T test vectors are bit exact verified
  • Common compressed speech frame stream to support systems with multiple codecs
  • Voice Activity Detection and Comfort Noise Generation
  • Optimized implementation

Configurations:

  • Direct interface to 8 KHz. PCM data stream. (µ or A-law)
  • Line echo cancellation
  • Operates on 10 msec frame
  • Can be used for compression of audio used in multimedia applications at a very low bit rate
  • Can be a part of H.324/H.323, MGCP, SIP
  • VAD and CNG compatible
  • Coder selection can occur at run time
  • Data modem systems compatible
  • Multiple instance/channels compatible
  • Seamless integration with RTP/RTCP, DTMF, VAD and jitter management

Typical Applications:

  • Voice over Internet (VoIP), VoN
  • Digital satellite systems
  • Voice/Fax/Data relay systems
  • Multimedia products
  • DCME, PSTN, ISDN
  • Digital leased lines
  • Voice store and forward
  • Video phones and cordless telephones
  • Land digital mobile radio

Metrics:

Processor: TMS320C54

 MIPS  10
 DM  1 KW
 PM  9.8KW

Processor: Proprietary DSP core with SIMD (Super scalar) architecture

 MIPS  8.0
 MCPS  5.0
 DM  1 KW
 PM  7KW
 Processor Loading*   3.34%

*For single instance application

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    ITU-T G.729B  -  Speech Codec

Description:

G.729B is ITU-T recommendation G.729 modified to achieve a reduction in the transmitted bit rate by exploiting silent periods in human speech.  This implementation provides coding of speech and audio signals used in multimedia applications at 8 kbps using Conjugate-Structure Algebraic-Code –Excited Linear Prediction(CS-ACELP).  This module is bit exact compliant with all the ITU-T test vectors. It has a one way algorithmic delay of 15 msec.  Typical input rates include µ or A-law 64 kbps PCM or 128 kbps linear PCM providing a compression ratio of up to 16:1.

Features:

  • Full duplex and half duplex mode of operation
  • Multiple instance/channel compatible
  • All ITU-T test vectors are bit exact compatible
  • Common compressed speech frame stream to support systems with multiple codecs

Configurations:

  • Direct interface to 8 KHz. PCM data stream. (µ or A-law)
  • Line echo cancellation
  • Can be used for compression of audio used in multimedia applications at a very low bit rate
  • Can be a part of H.324/H.323, MGCP, SIP
  • VAD and CNG compatible
  • Where multiple speech coders are available then coder selection can occur at run time
  • Data modem systems compatible
  • Multiple instance/channels compatible
  • Seamless integration with RTP/RTCP, DTMF, VAD and jitter management
  • RTOS implementation

Typical Applications:

  • Voice over Internet (VoIP), VoN
  • Digital satellite systems
  • Voice/Fax/Data relay systems
  • Multimedia products
  • DCME, PSTN, ISDN
  • Digital leased lines
  • Voice store and forward
  • Video phones and cordless telephones
  • Land digital mobile radio

Metrics:

Processor: TMS320C54

 MIPS  20
 DM  1.6KW
 PM  13KW

Processor:  Proprietary DSP core with SIMD (Super scalar) architecture

 MIPS  12.5
 MCPS  8.0
 DM  1.3KW
 PM  9.5KW
 Processor loading*   5.35%

*for single instance

  top

    ITU-T G.729AB  -  Speech Codec

Description:

G.729AB is ITU-T recommendation G.729A modified to achieve a reduction in the transmitted bit rate by exploiting silent periods in human speech and reducing the complexity of the algorithm. This implementation provides coding of speech and audio signals used in multimedia applications at 8 kbps using Conjugate-Structure Algebraic-Code –Excited Linear Prediction(CS-ACELP).  This module is bit exact compliant with all the ITU-T test vectors.  It has a one way algorithmic delay of 15 msec.  Typical input rates include µ orA-law 64 kbps PCM or 128 kbps linear PCM providing a compression ratio of up to 16:1.

Features:

  • Full duplex and half duplex mode of operation
  • Multiple instance/channel compatible
  • All ITU-T test vectors are bit exact compatible
  • Common compressed speech frame stream to support systems with multiple codecs

Configurations:

  • Direct interface to 8 KHz. PCM data stream. (µ or A-law)
  • Line echo cancellation
  • Can be used for compression of audio used in multimedia applications at a very low bit rate
  • Can be a part of H.324/H.323, MGCP, SIP
  • VAD and CNG compatible
  • Coder selection can occur at run time
  • Data modem systems compatible
  • Multiple instance/channels compatible
  • Seamless integration with RTP/RTCP, DTMF, VAD and jitter management
  • RTOS implementation

Typical Applications:

  • Voice message recorded announcements
  • Digital satellite systems
  • Voice/Fax/Data relay systems
  • Multimedia products
  • DCME, PSTN, ISDN
  • Digital leased lines
  • Voice store and forward
  • Video phones and cordless telephones
  • Land digital mobile radio

Metrics:

Processor: TMS320C54

 MIPS  11
 DM  1.5KW
 PM  12KW

Processor: Proprietary DSP core with SIMD (Super scalar) architecture

 MIPS  10
 MCPS  6.0
 DM  1.2 KW
 PM  9.2KW
 Processor loading*   4%

*for single instance

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    ITU-T G.729E  -  Speech Codec

Description:

G.729E is ITU-T recommendation G.729 modified to achieve a bit rate of 11.8 kbps.  This is ratified in September 1998 by the ITU as highest bitrate member of G.729 family of codecs.

G.729 annex E is designed to surpass the level of robustness and quality offered by the public switched telephone network (PSTN).  And for this reason, is the favorite candidate for solutions that are used in competing the legacy telephone system, like the various initiatives from cable providers to offer local telephony services.

Its excellent capability to transport general audio, like music and background elements, makes it a logical choice for remote surveillance, conferencing and announcements within call waiting applications.

Features:

  • Full duplex and half duplex mode of operation
  • Multiple instance/channel compatible
  • All ITU-T test vectors are bit exact compatible

Configurations:

  • Direct interface to 8 KHz. PCM data stream. (µ or A-law)
  • Line echo cancellation
  • Can be used for compression of audio used in multimedia applications
  • Can be a part of H.324/H.323
  • Coder selection can occur at run time
  • Data modem systems compatible
  • Multiple instance/channels compatible

Typical Applications:

  • Voice over Internet (VoIP), VoN
  • Voice/Fax/Data relay systems
  • Multimedia products
  • Conferencing
  • Remote surveillance
  • Voice store and forward
  • Video phones and cordless telephones
  • DSL

Metrics:

Processor: TMS320C54

 MIPS  27.15
 DM  1.9KW
 PM  18KW

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