3G2 to CVU Converter

Rip CVU sound from 3G2 videos in your browser

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Any Device Works

Use the converter on Windows, macOS, Linux, iOS, or Android. It runs in any modern browser regardless of your operating system or device.

Fast Processing

3G2 to CVU conversion happens on cloud servers at speed. Extract audio from video and download the CVU result in moments.

Cloud-Powered

All processing runs on our servers — your device handles nothing. Upload, convert, and download without draining local resources or battery life.

How to convert 3G2 to CVU

1

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

2

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

3

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

About formats

3G2 (3GPP2 file format) is a multimedia container developed by the 3rd Generation Partnership Project 2 for use on CDMA2000 mobile networks. Built on the ISO base media file format (MPEG-4 Part 12), it stores video encoded with H.263 or MPEG-4 Visual alongside audio in AMR, EVRC, or AAC codecs. The specification was first published in December 2003 to provide a standardized way for CDMA-based phones and networks to handle multimedia messaging and video playback. 3G2 files are engineered for extremely low-bandwidth conditions, achieving playable video quality at bit rates as low as 30-60 kbps. This makes the format especially efficient for mobile video capture on devices with limited processing power and storage. The container supports multiple tracks, timed text for subtitles, and embedded metadata. One significant benefit is near-universal compatibility with CDMA handsets from the mid-2000s era, ensuring reliable playback across a wide range of mobile devices. Though newer formats like MP4 have superseded 3G2 for most purposes, it remains useful for working with legacy mobile content and for situations where minimal file size is the primary concern.
Initial release: December 2003
CVU is an unsigned variant of the CVS telephony audio format, differing in how delta-encoded values are represented in the binary stream. While CVS stores slope delta values as signed quantities, CVU treats them as unsigned, shifting the numerical interpretation of each sample. Both share the underlying CVSD modulation technique — 1-bit adaptive delta coding where step size varies according to recent output bit patterns — operating at comparable rates, typically 16 kbps for narrowband voice at 8 kHz. The signed-versus-unsigned distinction matters at the decoder, where correct interpretation determines proper waveform reconstruction. CVU files appear in telephony and embedded communication contexts where hardware adopted the unsigned convention. A practical advantage is straightforward interfacing with systems using unsigned arithmetic natively, avoiding sign extension in decoders. Like its signed counterpart, CVU achieves extreme bandwidth efficiency, compressing voice into compact bitstreams for constrained links. SoX supports CVU, providing a reliable path for converting these niche telephony recordings into modern formats for analysis or archival.
Developer: CCITT / ITU-T
Initial release: 1970

Frequently Asked Questions

What is the benefit of converting 3G2 to CVU?

Some professional or archival systems require CVU format. Converting 3G2 to CVU makes your audio usable in those dedicated platforms and tools.

How can I open CVU files?

You can play CVU with SoX and signal processing applications handling unfiltered CVSD data.

Can I convert 3G2 to CVU on my phone?

Absolutely. The converter runs entirely in your mobile browser on iOS or Android — upload 3G2, pick CVU, and save the output to your device.

Do I need to install anything?

The converter is completely web-based. No software, no plugins — just open convertio.tools in any modern browser and convert 3G2 to CVU directly.

How long does 3G2 to CVU conversion take?

Our cloud servers handle the processing quickly. Typical 3G2 recordings convert to CVU in under a minute, though larger files naturally take longer.

Can I batch convert multiple 3G2 files?

Yes — upload several 3G2 files at once and convert them all to CVU in a single session. Each file processes in parallel on our cloud infrastructure.