T E C H N I C A L S P E C I F I C A T I O N F O R T H E O P E R A ™ S O F T W A R E S U I T E V 3 . 0
4
Includes official ITU voice samples for testing,
Includes PESQ conformance test samples,
Includes PSQM conformance test samples
PSQM+ Measurement
Description: Perceptual
measurement of speech quality according to ITU-T
rec. P.861. Indicates call clarity. Includes highly optimized
proprietary mapping from raw PSQM values to P.800 Mean
Opinion Score (MOS) scale. Results can be directly compared
to subjective listening tests. PSQM+ is optimzed for severe
distortions, such as packet loss and time clipping.
Algorithm standard:
Based on standard ITU-T rec. P.861
Sample rates:
8 kHz and 16 kHz
Sound file formats:
WAVE-files containing A-law, mu-law, linear PCM (8 or 16
bit)
Max. duration of measurement signals: As defined by WAVE-format
Gain Compensation:
Maximum gain difference = ±60 dB
Automatic Delay Compensation:
±1000 ms
Static Delay:
Automatic Delay Compensation ±10 s
Automated
operation:
Supported
Available Measurement Results:
Timesignal,
Spectrum,
Excitation,
Percentage of silent intervals during measurement (Silence),
Percentage of time clipped frames during measurement (Time
Clipped),
Percentage of severely distorted frames during measurement
(Sev. Distorted),
PSQM according to P.861, silence weight = 0.0 (PSQM-W0),
PSQM according to P.861, silence weight = 0.2 (PSQM-W2),
PSQM according to P.861, silence weight = 0.4 (PSQM-W4),
PSQM value of the silent intervals (PSQM-Silence),
Mean Opinion Score (MOS), silence weight = 0.0 (OMOS-
W0),
Mean Opinion Score (MOS), silence weight = 0.2 (OMOS-
W2),
Mean Opinion Score (MOS), silence weight = 0.4 (OMOS-
W4),
Mean Opinion Score (MOS) according to PSQM+
(OMOS+),
Mean Opinion Score (MOS) vs. Time,
Delay between the Reference Signal and the output signal of
the device under test,
Attenuation of the test signal compared to the reference signal
Additional Features:
File-based measurements,
Trigger functionality,
Содержание OPERA SOFTWARE SUITE - V3.0
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