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THALES Communications Les informations contenues dans ce document sont la propriété exclusive du Groupe THALES. Elles ne doivent pas être divulguées sans l'accord écrit de THALES Communications. 1/3 BSR-DAN-SIP-LRB 01.093 (20-Aug-01) VDL2 to AM-DSB Interferences (1/3) > TRADITIONAL METHOD TO QUANTIFY A VOICE LINK DEGRADATION (S+N)/N Degradation > HOWEVER, IN THE CASE OF A VDL2 UNWANTED SIGNAL Short spurious pulses can be observed before the (S+N)/N degradation (at the very moment when the VDL2 transmission begins) These pulses are heared as "clocks" added to the voice Auditive discomfort depends on the repetiton cycle > SIGNAL/PULSE RATIO CHARACTERISTIC Definition of a "Signal/Pulse Ratio" S/P = 6 dB has been validated for VDL2 by AMCP WGB Various results according to the receiver type
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THALES Communications Les informations contenues dans ce document sont la propriété exclusive du Groupe THALES. Elles ne doivent pas être divulguées sans l'accord écrit de THALES Communications. 2/3 BSR-DAN-SIP-LRB 01.093 (20-Aug-01) VDL2 to AM-DSB Interferences (2/3) (for S/P=6dB)
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THALES Communications Les informations contenues dans ce document sont la propriété exclusive du Groupe THALES. Elles ne doivent pas être divulguées sans l'accord écrit de THALES Communications. 3/3 BSR-DAN-SIP-LRB 01.093 (20-Aug-01) VDL2 to AM-DSB Interferences (3/3) > TECHNICAL ANALYSIS TO EXPLAIN VARIOUS RESULTS ACCORDING TO THE VERSION Type 1 » Receiver front end is equipped with high signals protection » S/P results depend on the protection threshold adjustment Type 2 » equipped with an "interlocking system" » slight differences in front end adjustments > HOW CAN RESULTS BE IMPROVED ? Protection adjustment change for type 1 Then, same results as for type 2 This minor change has been validated (no impact on other characteristics)
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