Digital Speech Standard

Readable

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.

Identify it

Extensions	`.dss.ds2`
Signatures	`02647373` at byte 0 (Digital Speech Standard) `647373` at byte 0 `647373` at byte 1
PRONOM	`fmt/1007fmt/1008`
Wikidata	`Q1224812`

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Open it

ExifToolOpen sourcereads · Artistic License / GNU General Public License, version 1.0 or later
FFmpegOpen sourcereads · LGPL-2.1-or-later / GPL-2.0-or-later
PhotoRecOpen sourcereads · GNU General Public License
Photorecoveryreads

Convert it

To	With	Fidelity	Command and losses
FLAC (Free Lossless Audio Codec) 1.2.1	FFmpeg	Lossless	`ffmpeg -i in.dss out.flac` Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.
Waveform Audio	FFmpeg	Lossless	`ffmpeg -i in.dss out.wav` Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.
Matroska 1-4	FFmpeg	Lossy	`ffmpeg -i in.dss out.mkv` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.
MPEG 1/2 Audio Layer 3	FFmpeg	Lossy	`ffmpeg -i in.dss out.mp3` Lossy re-encoding.
MPEG-4 Part 14	FFmpeg	Lossy	`ffmpeg -i in.dss out.mp4` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.
Ogg	FFmpeg	Lossy	`ffmpeg -i in.dss out.ogg` Lossy re-encoding.
WebM	FFmpeg	Lossy	`ffmpeg -i in.dss out.webm` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.

Versions and variants (1)

DSS ProUnknown

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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