MKV to CVU Converter

Extract unfiltered CVSD audio from MKV files online

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Raw Signal Data

CVU delivers unfiltered CVSD modulation. Extract raw MKV audio for delta modulation research and specialized voice analysis.

Remote Processing

All encoding work happens on convertio.tools servers. No local CVSD processing tools needed — upload MKV and collect the CVU file.

Fast Extraction

Audio-only conversion from MKV is swift. CVU files are ready within seconds, regardless of the original video length.

How to convert MKV 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

MKV (Matroska Video) is an open-standard multimedia container format developed by the Matroska project, which announced the format in December 2002. Named after the Russian matryoshka nesting dolls, the format is built on the Extensible Binary Meta Language (EBML), a simplified binary variant of XML that provides a flexible and forward-compatible structure. MKV can hold virtually unlimited numbers of video, audio, and subtitle tracks within a single file, supporting codecs from H.264 and HEVC to VP9 and AV1 for video, and AAC, FLAC, Opus, and DTS for audio. A standout feature is comprehensive subtitle support, handling formats from simple SRT text to complex ASS styled subtitles and bitmap-based PGS tracks from Blu-ray discs. MKV also supports chapter markers, attachments (such as fonts needed for styled subtitles), and tagging metadata, making it one of the most feature-rich containers available. The open specification ensures that any developer can implement MKV reading and writing without licensing fees, which has driven widespread adoption across media players, streaming tools, and encoding software. The ability to encapsulate virtually any codec combination in a single, well-organized file has made MKV the preferred container for high-quality video distribution, archival, and personal media libraries.
Developer: Matroska
Initial release: December 6, 2002
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

Why convert MKV to CVU?

CVU provides raw, unfiltered CVSD audio — useful when you need the unprocessed delta modulation signal for analysis or further filtering.

What processes CVU files?

SoX is the standard tool for CVU audio. Voice processing pipelines and research applications that work with raw CVSD data also handle it.

How does CVU differ from CVSD?

CVU is the unfiltered variant — no smoothing applied. CVSD applies filtering to the output. CVU gives you the raw modulation data.

Is CVU useful outside telephony?

CVU is primarily for voice research and delta modulation analysis. It is a specialized format, not intended for consumer audio playback.

Can I convert several files?

Yes — upload multiple MKV files and extract CVU audio from all of them in one batch session on convertio.tools.