What is a .GSM file?
GSM audio uses the low-bitrate codec built for early mobile phone calls.
- Did you know
- The GSM codec was designed in the 1980s to carry voice over digital mobile networks. (approximate)
- The GSM audio codec is GSM 06.10 Full Rate, standardised by the European Telecommunications Standards Institute for early digital mobile calls.
- It uses Regular Pulse Excitation with Long Term Prediction to squeeze 20-millisecond speech frames down to about 13 kbit/s.
- What Analyser reads
- Identify many more audio formats: lossless/hi-res codecs (Monkey’s Audio, WavPack, TAK, True Audio, DSD/SACD, Musepack), pro containers (Core Audio, RF64/BW64, Wave64, Sun AU, Broadcast Wave with timecode), speech/mobile (Speex, AMR-WB, QCP, 3GA, M4R, GSM), MPEG Layer I/II, instrument banks (SoundFont, SFZ, DLS, RIFF MIDI, GigaStudio), ringtones (RTTTL, iMelody, SAP), tracker modules (MOD, XM, IT, S3M, OctaMED, 669, Oktalyzer), chiptunes (NES NSF, SNES SPC, VGM, Game Boy GBS, AY, YM) and Audacity projects.
- Depth of analysis
- .GSM is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .GSM file
- Drag a .GSM file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.