Question 9/12 - Perceptual-based objective methods for voice, audio and visual quality measurements in telecommunication services
(Continuation of Question 9/12)
Motivation
The work of Question 9/12 will be focused on objective methods for evaluating quality parameters in telecommunication scenarios. Primarily, the methods under study should concentrate on user-perceived quality characteristics. Consequently, these methods and algorithms include perceptual approaches. They model results and procedures, which are applicable in subjective tests. So that subjective procedures will get an objective counterpart by using same scaling and basic procedures.
An example for that is the successful standardization of the Recommendation P.862, a perceptual based method, which models objectively Listening Only Tests with Absolute Category Rating for the evaluating of the Listening Speech Quality according to Recommendation P.800.
This Question will extend the objective evaluation of Listening Quality – the main issue up to
now – to other quality aspects of voice telephony like talking quality and wideband speech. Under consideration of new generation telecommunication services, also other media than speech like music and video should be taken into account. Furthermore, the evaluation of transmitted noise
–especially after processing by noise suppression systems – should be covered by the work of this Question.
The following Recommendations, in force at the time of approval of this Question, fall under its responsibility:
P.862, P.862.1, P.563
Question
Study items to be considered include, but are not limited to:
- Because the measurements at the acoustical interface of terminals are still an open issue, the continuation of this work is one of the main topics ofthis Question.
- It has to be underlined that the objective assessment of wideband speech is an important point of further investigation.
- An already defined work item in the previous Q.9/12 is the objective assessment of talking quality. Therefore at first a reliable subjective test method has to be established. In a second step, an objective model can be developed.
- In addition to the existing objective models like P.862 or P.563 that are producing single numbers describing the overall quality; a need for additional information about possible quality degradations is requested by the market. These so-called ‘cause-analysis’ approaches should be also a work item of the future work. It has be remarked, that also here different application scenarios has to be served: double ended and single ended measurements.
- Furthermore, the objective assessment of audio signals transmitted over telecommunication links like GSM or VoIP should be investigated.
- The objective rating of the annoyance of noise and residual noise – especially by processing by VQE’s – in voice communications has to be investigated. Here a close relationship to the recently approved subjective method P.835 is given.
- In addition to the voice related topics a request for evaluating of objective video assessment models was registered. This topic should be restricted to typical video applications in telecommunication services. That requires a restriction to low bit rate video coding as well as limited image sizes like used in mobile phones and PDA’s. Here a close partnership to VQEG is established.
Tasks
Tasks include, but are not limited to:
- Maintenance and enhancement of Recommendations in the P-series with regards to objective quality testing methods and perceptual models.
It is anticipated that new Recommendations on objective evaluation of
- Wideband speech quality
- Talking Quality
- Relationship between objectively assessed Listening Quality and Talking Quality to Conversational Quality
- Measurements at the acoustical interface of terminals
- Annoyance models for noise in voice communications
- Non-Speech signals in voice-band telecommunication scenarios (e.g. music)
- ‘Cause-Analysis’ approaches for quality degradations
- Evaluation of objective video/multimedia assessment models in close partnership with VQEG
can be produced in the 2005–2008 Study Period.
Furthermore, it is anticipated to produce application guidelines for existing Recommendations like P.862.
Relationships
Recommendations: P-series, G.700 Series
Questions: 2, 3, 4, 6, 7, 8, 10, 14/12
Study Groups: ITU-T SG 9, SG16
Standardization bodies:
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