E1993A Datasheet, PDF (38/40 Pages) Keysight Technologies – W-CDMA Mobile Test Application

38 | Keysight | E1963A W-CDMA Mobile Test Application - Technical Overview
Perceptual evaluation of speech quality (PESQ) measurement (E1999A-301)
The PESQ measurement provides an objective method for prediction of vocoder
speech quality using the industry standard PESQ algorithm.
Supported service options: AMR voice, WB-AMR
Measurement mode: Downlink audio, uplink audio, or downlink and uplink simultaneously
Speech Source: Male or female
Expected audio input peak voltage (downlink mode): 1 mV to 2.000 V
Maximum audio output peak voltage (downlink mode): 0 to 5.0000 V
Uplink PESQ score: –0.50 to +4.50
Downlink PESQ score: –0.50 to +4.50
PESQ uplink headroom: 0 to 100.0 dB
PESQ downlink headroom: 0 to 100.0 dB
Timebase specifications
Internal high stability 10 MHz oven-controlled crystal oscillator (OCXO)
Aging rates: < ±0.1 ppm per year, < ±0.005 ppm peak-to-peak per day during
any 24-hour period starting 24 hours or more after a cold start
Temperature stability: < +0.01 ppm frequency variation from 25 °C over the
temperature range 0 to 55 °C
Warm-up times: Five minutes to be within ±0.1 ppm of frequency at one hour,
15 minutes to be within ±0.01 ppm of frequency at one hour
Typical accuracy after a 30-minute warm-up period of continuous operation is derived from:
±(time since last calibration) x (aging rate) + (temperature stability) +(accuracy of calibration)
Typical initial adjustment: ±0.03 ppm
External reference
Input frequency: 10 MHz
Input frequency range: Typically < ±5 ppm of nominal reference frequency
Input level range: Typically 0 to +13 dBm
Input impedance: Typically 50 ohms
External reference output
Output frequency: Same as timebase (internal 10 MHz OCXO or external reference input)
Typical output level: Typically > 0.5 V rms
Output impedance: Typically 50 ohms