Mountain View, Calif. -- Rhythm NewMedia, a Mountain View-based developer of mobile advertising technology, said on Monday that it has raised $18 million in its second round of funding, led by Carlyle Venture Partners. All of the company's previous institutional investors, including Rembrandt Venture Partners. Lightspeed and Morgenthaler, also participated. Rhythm's technology is designed to support advertising on mobile video, mobile search and mobile messaging. The company received its initial seed funding in July 2005.