E6716G Datasheet, PDF (7/15 Pages) Keysight Technologies – E6702G cdma2000/IS-95/AMPS

07 | Keysight | E6702F cdma2000/IS-95/AMPS Lab Application - Technical Overview
Real-time Vocoder (continued)
Real-time Vocoder calibration type
Audio Output frequency
Encoder headroom report
Real-time Vocoder support
Encoder data rate mode
Encoder data rate
SO68 encoder operating point
SO70 encoder operating point
Expected input voltage
Max output voltage
Vocoder limitations
PESQ audio measurement option
Requires additional license E1999A-301
Functionality
Audio Output port (outputs a digital full scale Sine wave through
the front panel audio output port), Audio Input port (reports the
measured ADC headroom), internal codec (loops back the audio
input port signal to the audio output port)
User-settable from 300.0 Hz to 1.1 kHz, default 1KHz
Displays the audio in headroom relative to the ADC full scale value
13 k Vocoder in service options 17, and 32768, the EVRC Vocoder
in service option 3, the EVRC-B Vocoder in service option 68, the
EVRC-WB Vocoder in service Option 70 (fully support with special
ADC hardware)
Auto, fixed or limited; in auto mode the Vocoder algorithm selects
the rate based on the sampled audio; fixed mode locks the rate to
the user-selected rate; limited allows the Vocoder to use the user-
selected rate and any lower rate, if available
Full, half, quarter, or eighth
MS specified (default), 0, 1, 2, 3, 4, 5, 6, 7
MS-specified (default), 0, 4, 7
0 to 2 V; sets the input gain for external audio applied to the front-
panel audio in port
0 to 5 V; sets the output level of the decoded audio routed to the
front-panel audio out port
When active, no measurements are allowed during real-time
Vocoding
Provides an objective method for prediction of Vocoder speech
quality using the PESQ algorithm recommended by ITU-T P.862
standard. In conjunction with the real-time Vocoders built into the
8960, the PESQ measurement applies a voice sample to the phone
and compares the resultant voice signal from the phone to the
reference voice sample. Audio input and output to/from the phone
is handled via the 8960’s front panel analog Audio In and Audio Out
ports
–– Provides PESQ scores for downlink and uplink voice quality
from 1 to 5
–– Includes a single male voice sample and a single female voice
sample
–– Performs downlink, uplink, or simultaneous downlink and uplink
PESQ measurements in a single one-box solution (external
Audio Analyzer is not required)
–– Used with the 8960’s internal SO3 – EVRC, SO68 – EVRC-B
and SO70 – EVRC-WB real-time Vocoders
–– Test Vocoder speech quality without the need of additional
audio analyzer instrumentation
–– Simplified test procedures and overall test stations for
audio voice quality measurements