More than a thousand journalists have converged on Minneapolis for The Radio-Television News Directors Association annual convention which opened this afternoon. Over the next three and a half days, these broadcast journalists will debate the latest trends in their industry from digital television to so-called high speed news and web audiences. In addition to changing the way journalists do their jobs, these high-tech advances have also affected some of the ethical challenges facing reporters. So for the first time in almost two decades, the RTNDA is updating its code of ethics. President Barbara Cochran says the new code is much more specific.