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What is AU?

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

What is GSM?

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

When Should You Use AU vs GSM?

Use AU When...

Go with AU when legacy unix audio, sun workstation sound is on your mind. Its lossless pipeline means what you put in is exactly what comes out.

Use GSM When...

When mobile voice, legacy phone recordings, voicemail matters most, GSM delivers. Its compact footprint means faster uploads, less bandwidth, and happier visitors.

AU vs GSM: Key Differences

  • •AU and GSM diverge on compression: lossless compression for the source, lossy compression for the target.
  • •Moving from AU (lossy) to GSM (lossy) means the output file will be significantly smaller — but at the cost of some visual fidelity.
  • •Alpha channel support: GSM lacks transparency support, so semi-transparent pixels from the source will be lost.
  • •AU files are typically Small to medium, similar to WAV while GSM files range Very small, 13kbps bitrate
  • •Use case fit: AU targets legacy unix audio, sun workstation sound and GSM targets mobile voice, legacy phone recordings, voicemail — your choice depends on which workflow stage you are serving.

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.

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.

Common Use Cases for AU to GSM Conversion

  • Video game audio assets
  • Film soundtracks
  • Radio commercials
  • Guided meditation recordings
  • Audiovisual installation
  • Music education

Industry Applications

Game AudioFilm Post-productionAudiobook PublishingMusic StreamingLive SoundForensic Audio

Best Practices for AU to GSM Conversion

  • →For AU to GSM: 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
  • →GSM 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 AU and GSM formats in our detailed guide.

Troubleshooting AU to GSM Conversion

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

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About AU and GSM

AU

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

GSM

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

Format Comparison

CompressionLossless → Lossy
TransparencyN/A
Use CaseConvert from legacy unix audio, sun workstation sound to mobile voice, legacy phone recordings, voicemail
File Size~Very small, 13kbps bitrate after conversion

FAQs

Is converting AU to GSM free?

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

How long does it take to convert AU to GSM?

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

What is GSM best used for?

GSM is ideal for mobile voice, legacy phone recordings, voicemail. GSM 06.10, lossy speech codec used in mobile telephony

Does converting AU to GSM lose quality?

Yes, converting AU to GSM uses lossy compression, which reduces file size by discarding some visual data. Set quality to 85-95% for a good balance of quality and file size.

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

GSM files are typically 50-80% smaller than AU files because GSM uses efficient lossy compression. The exact reduction depends on quality settings.

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