Convert AFC to VOX

Understanding AFC and VOX file formats

AFC files are typically associated with Audio File Container formats, which are used to store compressed or uncompressed audio data. The specific codec or structure can vary, but AFC files are often found in video games or specialized audio applications.

VOX files, on the other hand, are Dialogic ADPCM compressed audio files. They are widely used in telephony systems and voice recording applications due to their efficient compression and low bandwidth requirements. VOX files usually have a sample rate of 8000 Hz and are mono.

How to convert AFC to VOX

Converting from AFC to VOX involves two main steps: extracting the audio from the AFC container and then encoding it into the VOX (Dialogic ADPCM) format. Since AFC is not a standard consumer format, you may need specialized tools to extract the audio data first.

Recommended software for AFC to VOX conversion

Audacity is a powerful, free, and open-source audio editor that supports a wide range of audio formats through plugins and libraries. However, direct AFC support is limited. If your AFC file is from a video game or proprietary source, you may need a tool like vgmstream (a command-line utility for extracting audio from game files) to convert AFC to a more common format like WAV first.

Once you have a WAV file, you can use Audacity to export it as VOX:

• Open the WAV file in Audacity.
• Go to File → Export → Export Audio....
• In the Save as type dropdown, select Other uncompressed files.
• Click Options... and choose VOX (Dialogic ADPCM) as the header and Dialogic ADPCM as the encoding.
• Click Save to export your VOX file.

For command-line users, SoX (Sound eXchange) is another excellent tool that can convert WAV to VOX with a simple command:

sox input.wav -r 8000 -c 1 output.vox

Summary

To convert AFC to VOX, first extract the audio from the AFC file (using vgmstream or a similar tool), then use Audacity or SoX to convert the resulting WAV file to VOX format. This ensures compatibility with telephony and voice processing systems.