Determining the Best Quality Audio
A typical SNV-12 Signal-and-Noise Voter application is an LMR system in which mobiles and portables can hear a repeater, but the repeater can’t hear them, due to their lower transmit power and/or the antenna size or placement. Remote receivers can be positioned in the communications dead spots, with audio from each receiver linked to the voter via IP or T1 microwave, IP fiber, landline, twisted pair, RF link, or fiber optics. The voter will select the best quality signal from all unsquelched remote receivers and forward this signal to the repeater for rebroadcast or monitor by a dispatcher, thus providing greater talk back range for the radios.
The SNV-12 Signal-and-Noise Voter accesses and analyzes backhaul audio from receiver/transceiver sites that use traditional analog backhaul such as leased lines, and also from receiver/transceiver sites that use IP backhaul methods such as a private network or IP microwave.
The SNV-12 votes the highest quality audio by analyzing the audio signals, regardless of backhaul method. This process enables the creation of extremely flexible, cost-effective radio voting networks.
Network delays and jitter create challenges to traditional analog voting which requires time-synchronized signals from multiple voting receivers. These challenges are capably handled by the combination of the QMT-1B.
When IP backhaul is used from a remote receiver site to the SNV-12 voter, a QMT-1B remote is co-located with the radio at the receiver/transceiver site. The QMT-1B provides timing information, digitizes the audio, and sends it to the SVM-3 module channel it is associated with in the SNV-12.
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