Computer Speakers for Your Ears Only

Microsoft researchers are developing an algorithm that would allow speakers to work like virtual headphones--even as you walk around your office.
More and more people are using their computers for voice communication, such as Skype and audio instant messaging. For the most part, however, using these features requires one either to be tethered to her computer by a headset or to speak directly into a microphone and keep the speaker volume low, especially in shared office space. Technology Review: Computer Speakers for Your Ears Only