Columbia, Md.-

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The Arbitron Co. built a special low-noise "critical listening room" here, to be used in the development of its "Portable People Meter."

Arbitron's first PPM field test is set for the Philadelphia DMA, starting late this year in Wilmington, Del.

The company said that as part of their recent agreement, "Nielsen Media Research will provide financial support," as well as its research expertise for that test.