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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.

What is VOC?

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

When Should You Use SPX vs VOC?

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.

Use VOC When...

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

SPX vs VOC: Key Differences

  • •The core technical difference: SPX relies on lossy compression whereas VOC uses lossless compression.
  • •The switch from lossy compression to lossless compression means you preserve full quality at the expense of larger file sizes.
  • •Alpha channel support: VOC lacks transparency support.
  • •Storage footprint: varies for SPX vs Similar to WAV for PCM audio for VOC.
  • •SPX is optimized for voip telephony, voice chat, speech compression while VOC is designed for legacy dos audio, retro computing — choose based on your specific workflow needs

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.

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.

Common Use Cases for SPX to VOC 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 SPX to VOC Conversion

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

Troubleshooting SPX to VOC Conversion

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

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About SPX and VOC

SPX

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

VOC

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

Format Comparison

CompressionLossy → Lossless
TransparencySupported
Use CaseConvert from voip telephony, voice chat, speech compression to legacy dos audio, retro computing
File Size~Similar to WAV for PCM audio after conversion

FAQs

Is converting SPX to VOC free?

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

How long does it take to convert SPX to VOC?

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

What is VOC best used for?

VOC is ideal for legacy dos audio, retro computing. Creative Voice, legacy sound card audio format

Does converting SPX to VOC lose quality?

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

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

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

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