Background
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Dynastat's Background and Historical Highlights

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1965 Development of the Diagnostic Rhyme Test (DRT) for measuring speech intelligibility by Voiers at Sperry

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1959 Development of the improved version of the DRT (DRT-IV) by Voiers and Sharpley at TRACOR, Inc., Austin, TX

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1974 Incorporation of Dynastat

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1975 Development of the Paired Acceptability Rating Method (PARM) under contract to Defense Communications Agency (DCA). This was the first measure used extensively by the DOD for assessing speech quality of communication systems. In addition surveyed over 100 operational communication personnel to establish relationship between the PARM scores from listening panels and acceptability ratings from users.

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1976 Evaluation of the State-of-the-art in speech coding algorithms for intelligibility and quality for the Defense Communication Agency.

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1977 Development of the Diagnostic Acceptability Measure (DAM) for measuring speech quality. In addition to reporting an overall score of acceptability also provides the effect of specific signal and background degradations on quality.

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1978 Development of the Diagnostic Communicability Test (DCT) for the Navy. Recognized need to measure the effectiveness of two-way communications.

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1979 Evaluation of laboratory and speech coder conditions to establish relationship between subjective and objective measures under contract to Georgia Tech.

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1981 Development of the Diagnostic Alliteration Test (DALT). The DALT is a final consonant rhyming word test that is structured the same as the DRT.

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1982 Development of the Diagnostic Discrimination Test (DDT). The DDT is designed to distinguish between coding and decoding defects or deficiencies in voice coding systems.

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1985 Implementation of the Spelling Alphabet Test (SpAT) using ICAO vocabulary for the Navy.

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1987 16KB Coder and 2.4KB Coder Evaluations for Department of Defense (DRT and DAM).

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1988 4.8KB Coder Evaluations for Department of Defense (DRT and DAM).

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1989 Refinement and Validation of DAM-IIB under Department of Defense sponsorship.

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1991-93 Further refinement of the DAM; development of the current version (DAM-IIC). Development of the Diagnostic Medial Consonant Test (DMCT). The DMCT is a medial consonant word test that is structured the same as the DRT and DALT. Further refinements of the DAM. Development of the "Modified" Modified Rhyme Test (MMRT) to permit systematic experimental variation of contextual information and communication competency. Development begun on Operational Communicability Test (OCT) for predicting intelligibility and user-acceptance in specific communications environments.

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1994 Development of a new version (DRT-V) of the DRT, which has additional scoring options and increased resolving power. Development begun on a practical test of the effects of communication devices and links on speaker-recognizability.

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1995 SBIR Phase I awarded titled "The Development of Auditory Icons for Representation of Virtual Objects in 3-D Space."

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1996 Comprehensive evaluation of 2400 bps for new Department of Defense standard for the Digital Voice Processor Consortium.  SBIR Phase I award titled "Development of a Method for Evaluating and Predicting Speaker Recognizability in Voice Communications Systems."

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1997 SBIR Phase II award to continue work on speaker recognizability.