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Clear-Com Tempest2400 User Manual

Page 15

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9

Tempest®24 00 2 -Channel Wireless Intercom System

With 2xTX technology, each audio packet is transmitt ed twice, each on one of two consecuti ve hops. The loss of one packet

transmission in a harsh RF environment is common. However, because of the quasi-orthogonal frequency relati onship of

the consecuti ve redundant packet transmission, the potenti al for loss of any single audio packet (2 consecuti ve data packet

transmissions) is dramati cally reduced. In additi on, each packet transmission is sent out from diff erent antennas. This

unique approach enables Tempest to uti lize spati al diversity, frequency diversity, ti me diversity and polarizati on diversity.

The 2-channel product does not operate with spati al or polar diversity due to the fact it uses a single antenna during

operati on.

Transmission redundancy and the incorporati on of various diversity techniques provide an RF system that is robust and

reliable under greatly varying operati onal conditi ons. Because of this inherent design, Tempest delivers superior operati onal

range and greater levels of interference and multi path fade rejecti on. Covering extremely large areas or multi ple coverage

locati ons can be problemati c with traditi onal wireless intercom systems. Tempest uti lizes diff erent roaming features that

allow it to “roam” from one coverage zone to another. When a diff erent BaseStati on is selected, the hopping patt ern and

key code of the BeltStati on is synchronized to the selected BaseStati on and the BeltStati on logs into the BaseStati on.

Audio latency is a criti cal factor in all digital systems. The hop durati on in Tempest is intenti onally kept very short - under

5ms. This short hop durati on limits the amount of data that may be lost in any one hop. More importantly, it reduces system

latency, which can cause undesirable echo. Total one-way (BeltStati on to BaseStati on) system latency is less than 50ms.

Even with this short system latency, unwanted and distracti ng echo will occur when interfacing with hardwired party-line

intercom systems unless echo-reducti on technology is implemented. Echo is primarily the result of ineffi ciencies in the

conversion of the two-wire signal. This conditi on exists in analog systems as well, but it does not cause unwanted echo

because there is no system latency delay. Tempest uses advanced echo-cancellati on algorithms to eliminate this echo.

Wireless intercom systems are oft en used in high-noise environments that require special design considerati on for eff ecti ve

operati on. Tempest operates extremely well even in very high ambient noise levels. This is primarily due to specifi c design

criteria which allow Tempest to achieve an audio dynamic range of greater than 94dB. This is more than double that of

most other digital wireless communicati on systems. This design makes Tempest ideal for use at sporti ng venues, concerts

and other events where unwanted noise levels are high.

Tempest off ers a host of features and technology to ensure that it performs well in almost all producti on environments

virtually anywhere in the world with no licensing requirements or fees.