User manual OPTICOM IPVD-520 DATASHEET

[. . . ] The Advanced IPVD-520 measurement technology is the latest out of OPTICOM's family of products for network quality assessment tools. Compared to other echo measurement algorithms OPTICOM's approach is unique because it uses real voice signals for the measurement rather than e. g. OPTICOM's IPVD-520 tool can be widley used in active testing in both lab environments and in network test equipment. Voice Quality Testing OPTICOM Product Line: Voice/Audio Quality PESQ ITU-T P. 862 3SQM ITU-T P. 563 PSQM ITU-T P. 861 IPVD-520 PEAQ ITU-T BS. 1387 Video Quality PEVQ Network Quality VQmon Principle A near end side IN (electrical or acoustical) 2-wire / 4-wire Echo caused by conversion from 4-wire to 2-wire coupling and vice versa Key Features: sending path B far end side · Echo Return Loss (ERL) and echo delays · OEM product available as DLL/Library optimized in performance and memory requirements · Detailed statistics of the occurrence of echoes for e. g. [. . . ] OPTICOM's IPVD-520 tool can be widley used in active testing in both lab environments and in network test equipment. Voice Quality Testing OPTICOM Product Line: Voice/Audio Quality PESQ ITU-T P. 862 3SQM ITU-T P. 563 PSQM ITU-T P. 861 IPVD-520 PEAQ ITU-T BS. 1387 Video Quality PEVQ Network Quality VQmon Principle A near end side IN (electrical or acoustical) 2-wire / 4-wire Echo caused by conversion from 4-wire to 2-wire coupling and vice versa Key Features: sending path B far end side · Echo Return Loss (ERL) and echo delays · OEM product available as DLL/Library optimized in performance and memory requirements · Detailed statistics of the occurrence of echoes for e. g. comprehensive graphical display and further analysis · Robust measurements even if the echoes are heavily distorted · Multiple echo detection Network 2-wire / 4-wire OUT (electrical or acoustical) Sidetone Echo which is supposed to improve the talking quality Echo caused by acoustical coupling at site B receiving path OPTICOM's Advanced IPVD-520 algorithm determines the echoes with the help of long term correlations of the speech signals at a voice network's input and output (see figure above). One advantage of using real voice signals over ordinary sine tones ­ as other algorithms propose ­ is that a voice signal is closer to the real world telephony situation. Sine tones might be treated more or less rigid by a network compared to real voice signals. For example echo cancellation devices employed in the network might be able to easily filter out detected sine tones but they might have difficulties handling a complex voice like signal. Using real speech signals for the measurement becomes even more valuable in digital e. g. VoIP networks, where signal delays increase due to the additional requirement for signal processing and without active echo cancellation methods or suppressors the echo signal would return to the talker annoyingly unattenuated. And while specialized on OEM customers in particular, the directory of OEM licensees today reads like the `Who-is-Who' of the Telecoms industry. OPTICOM is a privately held company located in Erlangen, Germany. 50 40 30 20 10 0 0 80 100 240 320 400 480 500 640 Delay in ms Unacceptable Echo Area ERL vs. Delay Acceptable Echo Area Tolerance Curve Specifications Advanced Perceptual IPVD-520 Measurement Tool ERL in dB Sales Contacts: OPTICOM GmbH Nägelsbachstraße 38 91052 Erlangen, GERMANY Phone: +49-91 31 / 5 30 20 - 0 Fax: +49-91 31 / 5 30 20 - 20 info@opticom. de www. opticom. de North America: Telchemy Inc. Phone +1-770-614-6944 JDSU - Acterna U. S. Phone +1-301 353 1560 2850 Europe, Latin America, Middle East & Africa, Asia Pacific, CIS Countries: JDSU - Acterna Germany GmbH Phone: +49-7121 86 2222 Through our distributor network, we are represented in more than 80 countries. To find your local sales office, please contact info@opticom. de Functionality · Echo Return Loss (ERL); echo attenuation in dB · ERLs and echo delays for multiple echoes · Perceptual estimation of echo annoyance, using subjective analysis results as stated in ITU-T G. 131 · Additional measurement outputs for comprehensive analysis · Narrowband and Wideband operation · Real speech signals for analysis Output · ERL / Delay for multiple echoes · Statistical information of the echo analysis, e. g. ERL / Delay histogram · Comprehensive evaluation of the echoes influence on conversationally perceived quality Platform · Windows · Linux Input · Two audio signals required: Reference speech signal and echo signal · 16 bit linear audio sampled at 8kHz and 16kHz · 6 to 20 seconds in length PEVQTM, 3SQMTM and the OPTICOM logo are registered trademarks of OPTICOM GmbH; the `single-sided speech quality measure' and `the perceptual quality experts' are trademarks of OPTICOM GmbH. [. . . ] Phone +1-301 353 1560 2850 Europe, Latin America, Middle East & Africa, Asia Pacific, CIS Countries: JDSU - Acterna Germany GmbH Phone: +49-7121 86 2222 Through our distributor network, we are represented in more than 80 countries. To find your local sales office, please contact info@opticom. de Functionality · Echo Return Loss (ERL); echo attenuation in dB · ERLs and echo delays for multiple echoes · Perceptual estimation of echo annoyance, using subjective analysis results as stated in ITU-T G. 131 · Additional measurement outputs for comprehensive analysis · Narrowband and Wideband operation · Real speech signals for analysis Output · ERL / Delay for multiple echoes · Statistical information of the echo analysis, e. g. ERL / Delay histogram · Comprehensive evaluation of the echoes influence on conversationally perceived quality Platform · Windows · Linux Input · Two audio signals required: Reference speech signal and echo signal · 16 bit linear audio sampled at 8kHz and 16kHz · 6 to 20 seconds in length PEVQTM, 3SQMTM and the OPTICOM logo are registered trademarks of OPTICOM GmbH; the `single-sided speech quality measure' and `the perceptual quality experts' are trademarks of OPTICOM GmbH. [. . . ]