Arbitron Inc., of Columbia, a provider of audience ratings for U.S. radio stations, reported fourth-quarter net income of $14.1 million, or 51 cents per diluted share, compared to $15.6 million, or 56 cents per diluted share, for the prior-year period.

Revenue rose to $120.1 million versus $111.7 million for the 2010 quarter.

The company attributed the lower profit to extraordinary expenses, including a $3.5 million pre-tax, non-cash impairment charge associated with its minority stake in a privately held media research firm.

Excluding that charge and other expenses, earnings for the 2011 quarter would have been 64 cents per share, a 10.5 percent increase over the prior-year period.

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