NEW YORK, August 12, 2004 – Arbitron Inc. (NYSE:ARB) has signed an agreement with eMediaTRADE (www.emediatrade.net) for access to that company’s Media eXchange Desk™ technology and services.

Arbitron plans to use the eMediaTRADE technology to assist in making future versions of Arbitron’s media planning and buying software and Arbitron radio sales software compatible with the American Association of Advertising Agencies (AAAA) standards for the exchange of transaction data between advertising agencies and media outlets. “Our vision is to give our agency and station customers a seamless, electronic buy/sell process, from avail request to invoice reconciliation,” said Owen Charlebois, president, U.S. Media Services, Arbitron Inc. “By using eMediaTRADE technology as the foundation for our future eCommerce capabilities, Arbitron expects to earn a leading position as a provider of media software that is 100 percent compatible with eCommerce standards that the industry has established.”

“eMediaTRADE is delighted to be providing Arbitron stations and agencies with document exchange hub services needed to deliver an exceptional EDI platform to the advertising industry,” said Michele Minchew, vice president, Sales & Marketing for eMediaTRADE. As part of the Arbitron plan for its media buy/sell eCommerce services, the company intends to make available a media document exchange hub that is compatible with AAAA eCommerce Standards.

Ad agency users of Arbitron planning and buying software will be able to create media documents, such as avail requests and orders, within their Arbitron software applications and transmit them to all other AAAA's standards-compatible business partners through this hub. Radio stations and other media outlets will be able to send media documents (proposals, order confirmations, invoices, etc.) through the same hub to all AAAA's standards-compatible business partners.

This agreement will also provide backward compatibility to legacy standards, such as the AAAA's Electronic Invoice standard and other, more proprietary EDI standards during the transition process.

About eMediaTRADE
eMediaTRADE’s management software simplifies EDI techniques by providing in-network translation, value-mapping, validation, and archiving of electronic documents. eMediaTRADE is a privately held firm in Atlanta, Ga. committed to providing an open electronic trading environment between trading partners and enabling the electronic exchange of every type of business document in media trading, from the avail request to the invoice..

About Arbitron
Arbitron Inc. (NYSE: ARB) is an international media and marketing research firm serving radio broadcasters, cable companies, advertisers, advertising agencies and outdoor advertising companies in the United States, Mexico and Europe. Arbitron’s core businesses are measuring network and local market radio audiences across the United States; surveying the retail, media and product patterns of local market consumers; and providing application software used for analyzing media audience and marketing information data. Arbitron Internet Broadcast Services measures the audiences of audio and video content on the Internet, commonly known as webcasts. The Company is developing the Portable People Meter, a new technology for radio, television and cable ratings. Arbitron’s marketing and business units are supported by a world-renowned research and technology organization located in Columbia, Maryland. Arbitron has approximately 850 full-time employees; its executive offices are located in New York City. Through its Scarborough Research joint venture with VNU, Inc., Arbitron also provides media and marketing research services to the broadcast television, cable, magazine, newspaper, outdoor and online industries.

###

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The statements regarding Arbitron in this document that are not historical in nature, particularly those that utilize terminology such as “may,” “will,” “should,” “likely,” “expects,” “anticipates,” “estimates,” “believes” or “plans,” or comparable terminology, are forward-looking statements based on current expectations about future events, which Arbitron has derived from information currently available to it. These forward-looking statements involve known and unknown risks and uncertainties that may cause our results to be materially different from results implied in such forward-looking statements. These risks and uncertainties include whether we will be able to:

• renew all or part of contracts with large customers as they expire;
• successfully execute our business strategies, including timely implementation of our
• Portable People Meter services, as well as expansion of international operatio ns;
• effectively manage the impact of further consolidation in the radio industry;
• keep up with rapidly changing technological needs of our customer base, including
• creating new products and services that meet these needs;
• successfully manage the impact on our business of any economic downturn generally and in
• the advertising market in particular; and
• successfully manage the impact on costs of data collection due to privacy concerns and/or
• government regulations.

Additional important factors known to Arbitron that could cause forward-looking statements to turn out to be incorrect are identified and discussed from time to time in Arbitron’s filings with the Securities and Exchange Commission, including in particular the risk factors discussed under the caption “ITEM 1. BUSINESS - Business Risks” in our Annual Report on Form 10-K. The forward-looking statements contained in this document speak only as of the date of this release, and Arbitron undertakes no obligation to correct or update any forward -looking statements, whether as a result of new information, future events or otherwise.

For more information, contact: Thom Mocarsky
Arbitron Inc.
212-887-1314

Randall Johnson
eMediaTRADE™
678-239-0034