- WB measurements in general
- Inaccuracy with CDMA codecs (e.g., EVRC) and, therefore,
- CDMA networks in general
- Sensitivity to certain GSM/WCDMA network conditions
- (DTX/Voice Activity Detection in AMR codec)
- VoIP limitations (variable delay up to 1sec)
- Strong linear distortions (e.g., phone’s frequency shaping) as well as gain variations
- Limitations with speech processing (enhancement) devices
- (noise reduction, automatic gain control)
Reason 2. POLQA has new operational features.
Works in all three available bandwidths (NB, WB, SWB) and under different
background noise conditions (street, car, restaurant, babble, impulse, etc.)
Works with all new commercial and standardized codecs used in different
technologies (GSM/WCDMA, LTE, VoIP, VoIP over IMS) such as
AMR-WB, EVRC-WB, iLBC, AMB+, AAC, Skype / SLIK, G.711, G.729, etc.
Allows measurements at various combinations of interfaces:
electrical-electrical, acoustical-acoustical, electrical-acoustical, and
acoustical-electrical — providing the opportunity to test terminals and
hands-free applications
