Atec Agilent-N4010A - Manual (Page 8)

8
N4010A Option 113 Bluetooth audio
generation and analysis 1
N4010A Option 113 simplifies Bluetooth audio test
configurations and provides cost-effective functional test
of Bluetooth audio devices by performing a basic set of
audio measurements (level, SINAD, and THD+N).
Audio routing settings Loopback, audio input/output,
audio generator/analyzer
Audio generator
Frequency 125 Hz to 3.875 kHz, default of
1.0 kHz
Frequency resolution 125 Hz
Level –75 to +3 dBmO, default –15 dBmO
Level resolution 1 dBmO
Audio analyzer
Range 125 Hz to 3.875 kHz in 125 Hz steps
Measurements SINAD (dB), total harmonic
distortion + noise (%) frequency (Hz),
level (dBmO)
Frequency accuracy Accuracy as frequency reference,
resolution 7.8125 Hz
Measurement variation (at frequency 1.125 kHz, level –15 dBmO
and EUT in SCO loopback) 2, 3
Level < ±0.2%
Distortion + noise < ±1%
SINAD < ±1 dB
Number of averages 1 to 100
N4010A Bluetooth audio system performance
and SINAD floor specification 2,3
Number of SCO channels
supported
1
CODEC air interfaces sup-
ported
CVSD, A-law, µ-law
Frequency response +0.6 to –1.0 dB (320 to 3200 Hz 4, 5 )
See Figure 1 for CVSD frequency
response)
Maximum input/output
signal levels
3.28 V pk-pk = 1.16 Vrms 5, 6
For CVSD, recommend level
< 138 mVrm 6
Distortion/noise (THD+N) Better than –52 dB (A-law, µ-law)
Better than –35 dB (CVSD 5, 6 )
See Figure 2 for CVSD distortion
characteristics
Variation of gain (–55 to
+3 dBm, 225 to 2040 Hz)
< 0.5 dB 5, 6
Idle noise (200 Hz to 20 kHz) Better than –64 dBm
SINAD floor for N4010A
audio paths (at 1.125 kHz
frequency and –15 dBmO
level)
> 29 dB
Out of band performance
(4 to 32 kHz)
Better than –30 dB (A-law, µ-law)
Better than –42 dB (CVSD)
Input/output connectors BNC input, BNC output
Input impedance 150 kΩ
Output impedance 50 kΩ (AC coupled)
Minimum output load 0 Ω (AC coupled, no damage
caused by short)
1. Qualified in accordance to ITU specification G.711 [8], where 775 mVrms
(0 dBm) analog sine wave input voltage is translated to 0 dBm0 digital
CVSD transmit signal and 0 dBm0 sine wave CVSD receive signal is
output as 775 mVrms (0 dBm) analog voltage. All audio characteristics
are nominal.
2. When using N4010A audio frequencies which are multiples of 1 kHz,
harmonic distortion components may cause variations in SINAD measure-
ments. Frequency setting of 1.125 kHz is recommended for optimum
internal audio/generator measurements.
3. N4010A Bluetooth audio system performance (frequency response,
distortion/noise, etc) will also contribute to the overall measurement
performance of Option 113 audio analyzer. This also applies to the use of
external audio analyzers/generators with the N4010A.
4. For CVSD this performance only applies within the CVSD linear range.
5. CVSD linear range is defined as signals of 320 to 3200 Hz and level
< –15 dBm0 (138 mVrms analogue). Outside the CVSD linear range
(e.g. signals of frequencies above 600 Hz with levels > –15 dBm0) the
response rolls of due to the slew-rate limitations set by Bluetooth’s CVSD
algorithm parameters.
6. CVSD distortion (THD+N) at 1020 Hz and level –15 dBm0 is better than
4 percent.