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What is VOC?

Creative Voice (VOC) is a legacy audio format developed by Creative Labs for their Sound Blaster sound cards.

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 VOC vs AU?

Use VOC When...

For legacy dos audio, retro computing, nothing beats VOC. It sets the standard for quality, trusted by professionals who cannot afford compromises.

Use AU When...

AU is built for legacy unix audio, sun workstation sound. Think of it as the perfectionist — every pixel, every sample, preserved exactly as intended.

VOC vs AU: Key Differences

  • •VOC and AU diverge on compression: lossless compression for the source, lossless compression for the target.
  • •Since both VOC and AU use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
  • •How transparency is handled: AU supports transparency, so alpha information is preserved during conversion.
  • •VOC files are typically Similar to WAV for PCM audio while AU files range Small to medium, similar to WAV
  • •Primary audience: VOC is built for legacy dos audio, retro computing scenarios, while AU focuses on legacy unix audio, sun workstation sound — pick the format that matches your output requirement.

Advantages of VOC

  • ✓The lossless nature of VOC means file sizes stay reasonable while handling Legacy DOS audio, retro computing efficiently.
  • ✓From mobile devices to enterprise servers, VOC is recognized and supported everywhere.
  • ✓The trade-off for VOC's perfection is larger files — but for archival work, it is worth every megabyte.
  • ✓VOC is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Advantages of AU

  • ✓AU uses lossless compression tailored for Legacy Unix audio, Sun workstation sound.
  • ✓AU is supported natively on virtually every device, browser, and operating system.
  • ✓AU files are bit-for-bit perfect, preserving every pixel and sample for professional work.
  • ✓AU integrates seamlessly with all major creative tools and workflows.

Common Use Cases for VOC to AU Conversion

  • Film soundtracks
  • Radio commercials
  • Guided meditation recordings
  • Audiovisual installation
  • Music education
  • Conference call recordings

Industry Applications

Film Post-productionAudiobook PublishingMusic StreamingLive SoundForensic AudioMedical Transcription

Best Practices for VOC to AU Conversion

  • →Converting VOC to AU: AU preserves full audio fidelity — ideal for archiving master recordings
  • →Normalize audio levels before conversion for consistent playback volume
  • →AU excels in professional audio workflows
  • →Always keep a backup of your original files before converting
  • →Choose the appropriate quality settings for your specific use case

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

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

Troubleshooting VOC to AU Conversion

  • !Clicks or pops in the converted AU → sample rate conversion can introduce artifacts; use a clean multiple of the source rate
  • !AU file has silence at the beginning or end → trim the source VOC file before converting to avoid unnecessary padding
  • !Stereo image collapsed after converting VOC to AU → verify that the converter preserves channel mapping for multichannel audio
  • !The converted AU clips or distorts at peaks → reduce the gain or apply a limiter before conversion to prevent hard clipping

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Convert VOC files to AU online for free. High-quality conversion with no registration required.

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About VOC and AU

VOC

VOC (VOC audio) - Creative Voice, legacy sound card audio format. Best for legacy dos audio, retro computing.

AU

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

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from legacy dos audio, retro computing to legacy unix audio, sun workstation sound
File Size~Small to medium, similar to WAV after conversion

FAQs

Is converting VOC to AU free?

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

How long does it take to convert VOC to AU?

Most VOC 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

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

File size after VOC to AU conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

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