The Japanese company, one of the world's biggest electronics makers, said its NWZ-A810 and NWZ-S610 series of Walkman digital music players would be available in September.
The devices will support an open platform — which means they will play a variety of music formats such as MP3 and Microsoft's WMA, providing more choices for downloading and managing music and video collections online.
Sony added that it would pull the plug on its Connect Music Services, which distributes music in Sony's proprietary ATRAC audio format in North America and Europe. Specific timing will vary, but the move will not occur before March 2008.