AV1 to VOX Converter

Extract VOX telephony audio from AV1 video online

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IVR Standard

VOX Dialogic ADPCM is the telephony industry standard — converting from AV1 produces audio ready for IVR systems.

Compact Voice

VOX creates small telephony files — ideal for storing large numbers of voice prompts and call center audio.

Secure Files

AV1 uploads are erased immediately, and VOX outputs are deleted from our servers within 24 hours.

How to convert AV1 to VOX

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose vox or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your vox file right afterwards

About formats

AV1 (AOMedia Video 1) is an open, royalty-free video coding format developed by the Alliance for Open Media, a consortium whose founding members include Google, Mozilla, Microsoft, Amazon, Netflix, and Intel, among others. The specification was finalized in June 2018 with the goal of providing a next-generation video codec that surpasses the compression efficiency of H.264 and HEVC while remaining free from licensing fees. AV1 achieves roughly 30-50% better compression than HEVC at equivalent visual quality, making it particularly attractive for streaming platforms seeking to reduce bandwidth costs without sacrificing viewer experience. The codec supports a broad range of features including film grain synthesis, flexible tiling for parallel processing, content-adaptive resolution switching, and a rich set of intra and inter prediction modes. Hardware decoding support has expanded rapidly across mobile processors, GPUs, and smart TVs, addressing early concerns about computational demands during encoding. AV1 has seen wide adoption from major streaming services for delivering 4K and HDR content, and it serves as the video component of the WebM container for web-based playback. The royalty-free status makes AV1 especially important for open web standards and accessible media distribution.
Initial release: June 25, 2018
VOX is a headerless audio format built around Dialogic ADPCM encoding, widely adopted in telephony, interactive voice response (IVR) systems, and voice mail platforms since the 1980s. Each audio sample is compressed into 4 bits using an algorithm developed by Oki Electric and implemented in hardware on Dialogic Corporation's telephony interface cards. VOX files typically use a sampling rate of 6000 or 8000 Hz, producing extremely compact recordings optimized for speech intelligibility rather than musical fidelity. Because the format carries no header, playback software must know the sample rate and encoding parameters in advance — a trade-off that reduces overhead but demands careful file management. The primary advantage of VOX is storage efficiency: a one-minute voice recording at 8 kHz occupies roughly 240 KB, making it practical for systems storing thousands of prompts. Dialogic ADPCM conforms to the ITU-T G.726 standard, ensuring interoperability across telephony equipment from different vendors. Even as modern call centers migrate to IP-based systems with codecs like Opus, vast libraries of VOX recordings persist in legacy IVR deployments and compliance archives worldwide.
Initial release: 1983

Frequently Asked Questions

Why convert AV1 to VOX?

VOX uses Dialogic ADPCM — the standard encoding for IVR systems, call centers, and telephony voice prompt platforms.

What uses VOX files?

Dialogic IVR boards, Asterisk PBX, and enterprise call center platforms use VOX for voice prompts and hold messages.

Is VOX good for voice?

Yes — VOX ADPCM is optimized for speech at 6 kHz/4-bit, producing compact files ideal for telephony voice quality.

How small are VOX files?

VOX compresses to roughly half the size of 8-bit PCM — a minute of speech takes about 360 KB.

Is my data safe?

AV1 uploads are deleted right after processing. VOX outputs are purged within 24 hours.