S3 will give the first public demonstration of its next-generation Rio MP3 music player on Monday, the company confirmed yesterday. The player will make use of a new audio format that could double the storage capacity of the device, according to S3.

S3, which acquired the Rio when it bought Diamond Multimedia Systems earlier this year, will demonstrate the new device at the WebNoize digital music conference in Los Angeles, and at the Comdex show in Las Vegas, both of which kick off Monday, S3 officials said.

The new device will support the MP3, MPEG 2.5 and G.723 audio formats. The Rio will also incorporate security technology, proposed by the Secure Digital Music Initiative (SDMI), designed to prevent users from sharing the music they download with other MP3 devices, and so help protect music copyrights.

S3 officials wouldn't provide any other information about the new Rio, such as its expected price or when the company plans to ship the new player. The new device will be the successor to the Rio 500, which shipped in August of this year.

MP3 is a digital compression technology that can be used to deliver audio files over the Internet. The technology was initially viewed as a threat by the music industry, which believed MP3 would make it easy to distribute pirated music.

The Recording Industry Association of America (RIAA) unsuccessfully sued Diamond Multimedia in an effort to prevent it from selling the Rio. Soon after, RIAA helped establish the SDMI security specification.