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 ?
Reliability of the medical outcomes study short-form survey version 2.0 (Thai version) for the evaluation of low back pain patients.
HADS = Hospital Anxiety and Depression Scale, MPI = Multidimensional Pain Inventory, MSES = Moorong Self-Efficacy Scale, PRSS = Pain-Related Self-Statements Scale, PSEQ = Pain Self-Efficacy Questionnaire, SCL CSQ = Spinal Cord Lesion-Related Coping Strategy Questionnaire, SF-12 MCS = (Medical Outcomes Study) Short Form Health Survey-12 Mental Component Score, SF-12 PCS= SF-12 Physical Component Score.
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 kind of difference is often not captured in the studies the Clinton administration cites.
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.
The 9-item visit rating form from the Medical Outcomes Study (1) that was used in Flocke's study is an ordinal scale.
The Medical Outcomes Study Short Form (MOS SF-36), the Mental Component Summary (MCS) Scale, and the Physical Component Summary (PCS) Scale were the tools used to analyze data collected.
"Comparison of the Medical Outcomes Study Short-form 36-item Health Survey in Black Patients and White Patients with Acute Chest Pain." Medical Care 33 (2): 145-60.
With the growing interest in health status measurement, a generic instrument, the short form 36 (SF-36), was developed for use in the Medical Outcomes Study in the USA [3].
To assess quality of life, participants also completed a Medical Outcomes Study 36-item short-form health survey (SF-36) questionnaire concerning their ability to perform daily tasks.
At randomization, women in the supracervical hysterectomy group had higher scores on the 100-point Medical Outcomes Study sexual problems scale, with 100 representing no problems.
* OUTCOMES MEASURED Outcomes were sleep items, health-related quality of life as measured by the Medical Outcomes Study Short Form Health Survey (SF-36), chronic medical comorbidity, depression, and anxiety.
Many of the examples define levels of impairment on a multipoint scale or represent additional concepts beyond physical functioning, such as the Medical Outcomes Study Short Form 36.

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