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(Continuation of part of Question 8/15 and additional aspects)
Background and justification
Signal Processing Network Equipment (SPNE) is an integral part
of communication networks. SG 15 has developed
Recommendations on Circuit Multiplication, Speech Enhancement
(Network Echo Cancellers and Automatic Level Control), and GSTN/IP
Gateway Equipment. This Question deals with the study of
interoperability of SPNE, between different SPNE, and between SPNE
and existing and/or new voice-band traffic technologies, including
interactions between acoustic echo controllers and network
equipment. Its main purpose is to ensure the correctness of
Recommendations in the area of Signal Processing Network
Equipment, and to provide a discussion platform for
interoperability and interaction concerns.
Responsibility under this Question includes those Signal
Processing Recommendations not covered by Questions 5, 6, 7/15.
Question
- What interactions occur between similar and different SPNE?
- What interactions occur between voice-band signals and SPNE?
- What interactions occur between SPNE and end-terminal
equipment?
- What techniques should be used to ensure high-quality SPNE
recommendations?
Study items
Study items to be considered include:
- The availability of general evaluation procedures
- Interaction concerns between similar and different SPNE, and
between SPNE and/or existing new voice-band traffic technologies
- The evaluation of corresponding ITU-T Recommendations
- The interaction of acoustic echo control devices with SPNE
- The effect of tandem coding avoidance (vocoder bypass or TFO)
on in-path SPNE
Specific tasks
- The coordination of any activities verifying the quality of
the Recommendations
- Addressing performance concerns between Recommendations
involving SPNE and new or existing voice-band traffic types
Relationships
- Other questions of ITU-T SG 15 as relevant
- ITU-T SG 2 on dimensioning
- ITU-T SG 8 on facsimile
- ITU-T SG 11 on signalling interfaces
- ITU-T SG 12 on speech performance
- ITU-T SG 13 on network implications
- ITU-T SG 16 on modems and encoding algorithms
- ATM Forum and IETF
- ITU-R SG4 WP4B on voice on mixed
terrestrial/satellite networks
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