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Modulation Sciences, Dotcast Spar Over Interference

Modulation Sciences, (MSI) a developer of audio and video monitoring products has filed objections to a datacasting technology from Dotcast that it says interferes with the BTSC Pro Channel portion of analog terrestrial broadcasts, potentially endangering the ability of broadcasters to communicate during ENG.

Over the past four years, Dotcast has been developing a network platform that transmits data via broadcaster's analog signals. The service is currently being tested with several West Coast stations.

In 2002, Dotcast received approval from the FCC to allow stations to use Dotcast's dNTSC system; however Eric Small, CEO for MSI, says Dotcast's tests¾which were conducted by the ATTC¾doesn't take into account possible interference with the aural baseband of the analog signal and that the company's filings with the FCC are lacking.

"MSI believes that the Commission presently lacks sufficient information about the dNTSC system's effect on stereo, SAP and PRO channel operations to permit the continued authorization of the dNTSC system," Small told the commission.

Dotcast filed a response to the commission, dismissing Small's complaints as coming too late in the process and claiming that its test results did indeed take into account its impact of its dNTSC system on the aural carrier.

The test results show that "virtually no impairments were heard using the program materials tested on the main, stereo and SAP audio channels," the company said.