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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 SPX?

Speex, open-source speech codec for VoIP and voice — stored as audio/speex — uses lossy encoding to handle voip telephony, voice chat, speech compression. Typical file sizes: varies by content.

When Should You Use VOC vs SPX?

Use VOC When...

Reach for VOC when your priority is legacy dos audio, retro computing — its uncompromising quality ensures every detail is preserved.

Use SPX When...

Reach for SPX when your priority is voip telephony, voice chat, speech compression — its efficient compression makes sharing fast and storage minimal.

VOC vs SPX: Key Differences

  • •VOC uses lossless compression while SPX uses lossy compression — this is the fundamental technical difference between the two formats.
  • •Converting from VOC to SPX changes compression type: lossy source becomes smaller but with some quality tradeoff.
  • •Transparency: Not supported in SPX — converting from VOC will merge transparency into a solid background
  • •File sizes: VOC files typically range Similar to WAV for PCM audio and SPX files N/A.
  • •VOC is optimized for legacy dos audio, retro computing while SPX is designed for voip telephony, voice chat, speech compression — choose based on your specific workflow needs

Advantages of VOC

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

Advantages of SPX

  • ✓The lossy nature of SPX means file sizes stay reasonable while handling VoIP telephony, voice chat, speech compression efficiently.
  • ✓From mobile devices to enterprise servers, SPX is recognized and supported everywhere.
  • ✓Storage and bandwidth costs drop significantly when using SPX thanks to its efficient compression.
  • ✓SPX is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Common Use Cases for VOC to SPX 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 VOC to SPX Conversion

  • →For VOC to SPX: 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
  • →SPX 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 VOC and SPX formats in our detailed guide.

Troubleshooting VOC to SPX Conversion

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

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About VOC and SPX

VOC

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

SPX

SPX (SPX) - Speex, open-source speech codec for VoIP and voice. Ideal for voip telephony, voice chat, speech compression.

Format Comparison

CompressionLossless → Lossy
TransparencyN/A
Use CaseConvert from legacy dos audio, retro computing to voip telephony, voice chat, speech compression
File Size~Standard file sizes after conversion

FAQs

Is converting VOC to SPX free?

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

How long does it take to convert VOC to SPX?

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

What is SPX best used for?

SPX is ideal for voip telephony, voice chat, speech compression. Speex, open-source speech codec for VoIP and voice

Does converting VOC to SPX lose quality?

Yes, converting VOC to SPX 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 VOC to SPX?

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

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