Testing & Evaluation

Testing and Evaluation

Dynastat has implemented all major tests for evaluating voice communication systems for both speech intelligibility and speech quality. Dynastat's laboratory facilities in Austin, Texas are equipped to routinely perform all major methods for evaluating the performance of voice communication systems.

Speech Intelligibility Testing:

	Diagnostic Rhyme Test (DRT)*
	Modified Rhyme Test (MRT)*
	Phonetically Balanced Word Lists (PB)*
	Diagnostic Medial Consonant Test (DMCT)
	Diagnostic Alliteration Test (DALT)
	ICAO Spelling Alphabet (SpAT)

[*-ANSI standards for speech intelligibility testing]

Speech Quality (Acceptability) Evaluation:

Diagnostic Acceptability Measure (DAM)

Mean Opinion Score (MOS)

Degradation Mean Opinion Score (DMOS)

Comparison Mean Opinion Score (CMOS)

Dynastat maintains two 10 member listening crews for purposes of evaluating the performance of voice communication systems for government and commercial customers.

Ongoing Research Efforts:

	Establishing the relationships between methods used for evaluating voice communication systems.
	Developing methods for assessing speaker recognizability.
	Refinement of the DAM.
	Development and validation of new testing methods.

Recordings:

	Dynastat maintains an extensive library of recorded materials for all major tests of speech intelligibility and quality.
	Dynastat produces recordings of new materials as needed to supplement that library (i.e., new tests, ambient noise conditions, etc.).