1813 DSS Pro Audio Digital Speech Standard is a proprietary audio file format for the storage of digital speech recordings, which was jointly developed and introduced by Olympus, Grundig and Philips. The DSS Pro (.ds2) format supports improved sound quality over the original Digital Speech Standard format, and also supports file encryption. 1 Digital Preservation Department / The National Archives 22 Mar 2017 22 Mar 2017 fmt/1008 PUID ds2 File extension 1366 Digital Speech Standard DSS Pro BOF: 0x03 'DS2' 1 Absolute from BOF 0 0 03647332 Is subsequent version of 1812 Digital Speech Standard