CEO Steve Ballmer told attendees at the BUILD developers' conference that the service is in the planning stages, but remains on schedule for a 2011 launch.
The executive added that Microsoft is working with "dozens or hundreds of additional video content suppliers", so that the TV market can strengthen existing Xbox Live services such as ESPN, Hulu and Netflix, IndustryGamers reports.
Ballmer said: "Having all of that content is right on, it's fantastic, but it brings a new challenge with it. Certainly we all know the frustrations of using guides and menus and controllers, and we think a better way to do all of this is simply to bring Bing and voice to Xbox. You say it, Xbox finds it."
Microsoft was rumoured to be showcasing the television platform at this summer's E3 expo in conjunction with Diamond TV. As the demonstration did not take place, Diamond's involvement remains uncertain.
The company is releasing another Xbox Live dashboard update later this year, but there has been no word on whether a television service will be part of it.
Microsoft also unveiled its new PC operating system Windows 8 at BUILD.