NATO-NBVC 1200/2400 bps coder selection; results of TNO tests in phase 1
report
Purpose: The NATO Ad-Hoc Working Group on Narrow Band Voice Coding (AHWG-NBVC) was tasked to select a new standard 1200 and 2400 bps vocoder for use throughout NATO. For this purpose, the AHWG has initiated a selection process, that is aimed at evaluating which of three candidates is the most suitable coder.
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Method: During the first of three phases, speech intelligibility and speech quality measurements were carried out by three different test laboratories. TNO Human Factors was one of these laboratories; in phase 1, TNO-HF performed Consonant-Vowel-Consonant (CVC) tests for speech intelligibility, and Mean Opinion Score (MOS) tests for speech quality. All tests were carried out under four different acoustic noise conditions.
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Results and conclusions: CVC and MOS tests yielded clear quantitative results, which have adequate statistical resolution to draw conclusions regarding differences in performance between coders. Since the candidate coders have been æblinded', the identity of the coders is unknown to the authors of this report.
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Method: During the first of three phases, speech intelligibility and speech quality measurements were carried out by three different test laboratories. TNO Human Factors was one of these laboratories; in phase 1, TNO-HF performed Consonant-Vowel-Consonant (CVC) tests for speech intelligibility, and Mean Opinion Score (MOS) tests for speech quality. All tests were carried out under four different acoustic noise conditions.
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Results and conclusions: CVC and MOS tests yielded clear quantitative results, which have adequate statistical resolution to draw conclusions regarding differences in performance between coders. Since the candidate coders have been æblinded', the identity of the coders is unknown to the authors of this report.
TNO Identifier
9934
Publisher
TNO
Place of publication
Soesterberg