Appendix 3 - Radvision XT5000 - Detailed audio test results

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Test 1: Frequency response (-3 dB)

(Insert -6 dB signal at local site, measure at remote site)                 

G.711 A law

G.722.1

AAC-LD,

G.719

4.2 KHz

7.0 KHz

14.5 KHz

20.0 KHz

Test 2: Headroom (measured on AAC-LD signal coding)

Insert increasing amplitude 1 KHz tone at local site, monitor for overload distortion at remote site

Overload occurs at:                  +9dBm

Test 3:  Audio level

(Insert -6dBm 1KHz tone at local site, monitor received level at remote site.)

As the audio output level is affected by the volume control this test was not carried out.

Test 4: Echo Cancellation

Setup     The echo canceller is fully automatic in operation. The quality of echo cancellation and doubletalk from the system was excellent.

Lecture Theatre

Room

Audio levels adequate? (Yes/no)

Not tested

Yes

Audio quality acceptable? (Yes/no)

Not tested

Yes

Echo cancellation acceptable? (Yes/no)

Not tested

Yes

Quality of double talk

Not tested

Excellent