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T E C H N I C A L
S P E C I F I C A T I O N
A N A L Y Z E R
Additional Features:
PSQM+ Measurement
Description:
Algorithm standard:
Sample rates:
Sound file formats:
Max. duration of measurement signals:
Gain Compensation:
F O R
T H E
O P E R A ™
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) 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
File-based measurements,
On-line measurements,
Trigger functionality,
Printing and graph exporting functionality,
Includes official ITU voice samples for testing,
Includes PESQ conformance test samples,
Includes PSQM conformance test samples
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.
Based on standard ITU-T rec. P.861
8 kHz and 16 kHz
WAVE-files containing A-law, mu-law, linear PCM (8 or 16
bit)
File-based:
32
2
On-line:
(
fs
(e.g. ~12.4 hours at 48 kHz, 16 bit resolution)
Maximum gain difference = ±60 dB
4
O B J E C T I V E
P E R C E P T U A L
As defined by WAVE-format
(
bitspersam
ple
) 8
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