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What is GSM?

GSM 06.10 is a lossy speech codec used in GSM mobile phone networks for compressing voice calls into low bitrates.

What is AU?

Sun AU is the native audio format for Sun Microsystems workstations, using simple mu-law encoding or uncompressed PCM.

When Should You Use GSM vs AU?

Use GSM When...

Go with GSM when mobile voice, legacy phone recordings, voicemail is on your mind. Its efficient encoding keeps things lean without sacrificing too much quality.

Use AU When...

When legacy unix audio, sun workstation sound matters most, AU delivers. Its pristine output guarantees professional-grade results every single time.

GSM vs AU: Key Differences

  • •The core technical difference: GSM relies on lossy compression whereas AU uses lossless compression.
  • •Moving from GSM (lossless) to AU (lossless) means the output file will be larger — but every bit of the original is preserved.
  • •Alpha channel support: AU lacks transparency support.
  • •Storage footprint: Very small, 13kbps bitrate for GSM vs Small to medium, similar to WAV for AU.
  • •Use case fit: GSM targets mobile voice, legacy phone recordings, voicemail and AU targets legacy unix audio, sun workstation sound — your choice depends on which workflow stage you are serving.

Advantages of GSM

  • ✓GSM uses lossy compression tailored for Mobile voice, legacy phone recordings, voicemail.
  • ✓GSM is supported natively on virtually every device, browser, and operating system.
  • ✓GSM files are compact and quick to transfer, even over slow connections.
  • ✓GSM integrates seamlessly with all major creative tools and workflows.

Advantages of AU

  • ✓At its core, AU relies on lossless encoding — a design choice that makes it perfect for Legacy Unix audio, Sun workstation sound.
  • ✓You won't run into compatibility issues with AU — it's a universal standard across platforms.
  • ✓File size management with AU: larger files guaranteed to match the original exactly.
  • ✓Every major application in the Legacy Unix audio, Sun workstation sound space supports AU natively.

Common Use Cases for GSM to AU Conversion

  • Music production and mixing
  • Podcast distribution
  • Voice recordings
  • Streaming services
  • Audio books
  • Sound design

Industry Applications

Music ProductionPodcastingBroadcastingAudio EngineeringLanguage LearningAccessibility

Best Practices for GSM to AU Conversion

  • →For GSM to AU: match the sample rate and bit depth to your delivery platform — 44.1 kHz / 16-bit is the standard for music
  • →Apply loudness normalization (LUFS) before conversion to ensure consistent volume across your audio library
  • →AU prioritizes quality — ensure your storage can accommodate the resulting file sizes
  • →Check that metadata tags (artist, album, track number) survive the conversion
  • →Convert a short segment first to verify quality at your chosen bitrate
  • →Keep a lossless master copy in case you need to re-encode for a different platform

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

Learn more about GSM and AU formats in our detailed guide.

Troubleshooting GSM to AU Conversion

  • !AU audio quality degraded vs GSM → use a higher bitrate (at least 256 kbps for music)
  • !AU file won't play on your device → check format compatibility with your player or platform
  • !Metadata (artist, album, title) lost after GSM to AU conversion → some formats like AU may not support ID3 tags
  • !Volume changed after converting GSM to AU → normalize audio levels before conversion for consistent playback

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About GSM and AU

GSM

GSM (GSM audio) - GSM 06.10, lossy speech codec used in mobile telephony. Best for mobile voice, legacy phone recordings, voicemail.

AU

AU (AU audio) - Sun AU, legacy Unix audio format for Sun workstations. Ideal for legacy unix audio, sun workstation sound.

Format Comparison

CompressionLossy → Lossless
TransparencySupported
Use CaseConvert from mobile voice, legacy phone recordings, voicemail to legacy unix audio, sun workstation sound
File Size~Small to medium, similar to WAV after conversion

FAQs

Is converting GSM to AU free?

Yes, GoConvertFile offers free conversion of GSM to AU for files up to 100MB. No registration required.

How long does it take to convert GSM to AU?

Most GSM to AU conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is AU best used for?

AU is ideal for legacy unix audio, sun workstation sound. Sun AU, legacy Unix audio format for Sun workstations

Does converting GSM to AU lose quality?

No, converting GSM to AU does not cause additional quality loss — AU uses lossless compression. However, any artifacts already present in the original GSM file will persist in the AU output.

What file size should I expect after converting GSM to AU?

AU files are typically 2-5x larger than equivalent GSM files because AU preserves all pixel data. This is expected and necessary for lossless quality.

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