Audio file created in the Digital Speech Standard Pro (DS2) format, a highly compressed audio format developed by Olympus for digital voice recordings; typically contains a recording of human speech that is saved to a recording device's memory card; used for saving personal and professional notes, often by laywers, researchers, and physicians; useful for sending as email attachments because of the highly compressed file size.

DS2 files can be converted to standard .WAV files using DSS Player Pro, a software application included with some Olympus digital voice recorder purchases. DS2 files can also be converted with DSS File Converter from Voelker Software. NOTE: Example Olympus devices that create DS2 files include the DS-2400, DS-4000, and DS-5000.