Voice Quality Measurement
Voice Quality Measurement (VQM) is a means of measuring customer experience in telecommunications.
The most accurate method of voice quality measurement is to ask callers their opinion. by interrupting the call and checking whether the voice quality is acceptable. However, for obvious reasons, this isn’t a practical or scalable solution.
Psytechnics has invented objective testing algorithms as a practical means of measuring voice quality. The key to creating these algorithms involves the unraveling of the human perceptual code and creation of a model of human listening and viewing perception. The only way to develop an accurate model of human perception is to base it on the results of subjective tests using real people of various ages, cultural background and vocation.
The accuracy of our objective testing algorithm is based on the breadth and depth of the subjective test databank used during its development. Psytechnics has conducted the world’s most comprehensive set of such tests. The data has been instrumental in developing six ITU standards, including the voice quality measurement algorithm PESQ™. We are constantly adding to this databank of human perceptions of quality to enable us to deliver the world’s best solutions. Currently our databank incorporates over 500,000 test records.
During a subjective test each subject listens to the same range of sound samples and rates them according to the simple ITU-T listening quality score scale. From the individual results an average score known as the Mean Opinion Score (MOS) can be calculated.
The MOS scale runs from one to five. A score of between 3.6 and 4.2 is widely accepted as being a good score for a network, and is generally considered to be toll quality.