MOS

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MOS

(solid-state physics)

MOS

MOS

(1) (Metal Oxide Semiconductor) See MOSFET.

(2) (Mean Opinion Score) The quality of a digitized voice line. It is a subjective measurement that is derived entirely by people listening to the calls and scoring the results from 1 to 5. Toll quality audio is generally considered to have a MOS rating of 4 and above.

The MOS is an average of the numbers for a particular codec. Because MOS testing requires carefully prepared and controlled test conditions, the best way to get a MOS test done is to have it outsourced. See codec.

An Objective Model
The E-Model is another rating system that provides an objective measurement of quality based on packet loss, jitter and delay. The E-Model reports results as R-values. Following is an approximate relationship between MOS and E-Model quality ratings.

Subjective Interpretation         MOS  R

 Perfect                           5.0 100

 Excellent - almost all satisfied  4.5  90

 Very good - most are satisfied    4.0  80

 Good - some are dissatisfied      3.6  70

 Fair - many are dissatisfied      3.1  60

 Poor - most are dissatisfied      2.6  50

 Bad - not recommended             1.0   0
References in periodicals archive ?
Validade de constructo de escala de apoio social do Medical Outcomes Study adaptada para o portugues do Estudo Pro-Saude [Construct validity of the Medical Outcomes Study's social support scale adapted to Portuguese in the Pro-Saude Study].
Detection of depressive disorder for patients receiving prepaid or fee-for service care results from the Medical Outcomes Study.
3% BDI, Beck Depression Inventory; MOS MCS, Medical Outcomes Study Short Form Mental Component Score; MOS PCS, Medical Outcomes Study Short Form Physical Component Score.
Differences in 4-Year Health Outcomes for Elderly and Poor, Chronically Ill Patients Treated in HMO and Fee-for-Service Systems: Results from the Medical Outcomes Study.
45] Subjective view of global health is provided by the Medical Outcomes Study (MOS) SF-36, a widely accepted outcome study that has shown statistical validity when used by a variety of examiners in numerous clinical situations.
Shapiro of the Physician Payment Review Commission (a federal agency), generalists in the Medical Outcomes Study "may have seen a substantial number of patients with upper respiratory infections or acute low back pain, whereas cardiologists may be seeing patients referred for evaluation of syncope or the new onset of chest pain.
This sub-study analysis published today in Circulation Cardiovascular Quality and Outcomes, demonstrates that quality of life scores that were 10-20% below population norms, as measured by a commonly used health survey called the Medical Outcomes Study Short Form-36 (SF-36), returned to population norms for patients treated with ablation, but did not change with drugs.
Study results showed that relative to other patients, the patients with isolated diastolic dysfunction had a higher body mass index; had greater prevalences of diabetes, hypertension, and heart failure; were more likely to have nonparoxysmal atrial fibrillation; and had poorer quality of life as assessed with both the Medical Outcomes Study 36-item questionnaire (SF-36) and the Mayo AF-specific Symptom Inventory (MAFSI).
The questionnaires used included the Medical Outcomes Study 36-Item Short Form, the Functional Assessment of Cancer Therapy (General and Prostate Specific), the Expanded Prostate Cancer Index Composite (EPIC), and the American Urological Association Symptom Index.
The researchers obtained measures of quality of life using the Physical Component Summary (PCS) and Mental Component Summary (MCS) scales of the Medical Outcomes Study Short-Form Health questionnaire.
We analyzed cross-sectional data from the Medical Outcomes Study (MOS), a 4-year prospective observational study of adult outpatients conducted from 1986 to 1990.

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