Below you'll find a list of all posts that have been categorized as “Lab”
LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard Skype This month’s Application Focus discusses the evolution of the EVS codec and two use cases applicable to wireless network operators. We begin with a short reminder of what EVS is, how it is being adopted around the world, and the potential – and challenges – it presents to network operators. …
LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard Skype“Do I really need POLQA?” The question is understandable, as the cost of POLQA can be a little greater than the cost of PESQ. MultiDSLA customers recognize great value and sometimes want to pursue it to the limit! Well, predictably, the answer is “It depends…” but to be more helpful Opale published …
LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard SkypeWhen a quick dash for the MOS is not enough The Task Sometimes that quick dash to fill a spreadsheet with Mean Opinion Scores (MOS) just won’t cut it. OK, we get it, your manager wants a report on the voice quality performance of widget X, so you reach for the test …
LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard SkypeSelecting Reference Speech Files In this third episode of “Do you really know everything about MOS” video series, we explain how to select correct reference speech files for POLQA and PESQ voice quality tests. You will also learn how to verify the ITU compliance of the reference speech files you are actually …
LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard SkypeVoLTE device manufacturers’ challenge Modem chipset designers and cellular device manufacturers need to characterize the performance of their products. Not just under ‘ideal’ network conditions, but also in the ‘real world’ of packet loss and jitter. Network Operators too need to satisfy themselves about the voice quality delivered by new devices. And …
LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard SkypePOLQA or PESQ? In this second episode of “Do you really know everything about MOS?” video series, we explore in more details ITU PESQ and POLQA MOS algorithms and related test methodologies. You will learn what are the limitations for each algorithm, and when to choose PESQ or POLQA (ITU P.863) depending …
LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard SkypeAbout this video: MOS has become a common requirement in device and network testing, but the origin and meaning of MOS can be obscured and confused. In this 4-minute video, we begin a discussion of three key aspects of voice quality measurement: Mean Opinion Score, POLQA & PESQ and speech samples for …
The second article in a series looking at the new version of ITU-T Rec. P.863 POLQA. Speaker dependency in the Narrowband Model is the focus here.
Aspects of Skype performance between two LTE phones on the network, over WiFi and between WiFi and the network
A new version of ITU-T Rec. P.863 POLQA is now included in MultiDSLA. Discover what has changed in v2.4.
