Know everything about MOS – Part 3: Reference Speech Files

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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 …

VoLTE Quality Assessment

Voice Quality Assessment for VoLTE Devices

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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. The RTP packet stream from the network to the VoLTE device may be subject to impairments …

POLQA & PESQ – Know everything about MOS – Part 2

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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 …

Speech Transmission Bandwidths

Wideband or Narrowband?

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LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard SkypePhone services have seen an extension of the upper limit of audio frequency from the traditional 3.4kHz of PSTN to 7.5kHz for wideband. VoLTE and 4G services using AMR can be wideband. OTT or desktop applications can be 12kHz or up to super-wideband. Conferencing services may even be full-band.   How do …

windows10-home

Upgrading to Windows 10 Affects Softkeys

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LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard SkypeMultiDSLA and other Malden applications can be installed and will run under Windows 10 Pro using softkey or dongle key management. If you are running MultiDSLA or SVN only on the Windows 7 Pro or Windows 8/8.1 Professional PC then upgrade MultiDSLA to v5.1.3 or SVN v 2.7.4 from the Software Maintenance Portal …