PITTSBURGH -- Ansys announced third-quarter net income rose 13.4% year-over-year to $45.5 million.

Sales rose 13.9% to $196.9 million for the period ended Sept. 30. The operating profit margin was 37.4%, down from 37.8% in 2011.

"We are facing a challenging and uncertain environment, which has led to a noticeable lengthening of procurement cycles," stated Jim Cashman, Ansys president and CEO. "[W]e expect these macro-economic challenges and longer sales cycles to continue through the remainder of the year and into the next."

The company, which makes software for printed circuit and electronics high-frequency design and analysis, forecast December quarter revenue of $211.3 million to $218.3 million, and said 2013 revenue would rise 11 to 13% over final 2012 numbers.