CVU to HCOM Converter

Switch from CVU to HCOM with a browser-based converter

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Rapid Conversion

Speed matters. Our converter transforms CVU to HCOM in moments, so you get your audio in the right format without waiting.

Effortless Conversion

The entire CVU to HCOM process is designed for simplicity. Drag your audio in, pick the format, and grab the output.

Modern Format

CVU recordings become far more usable as HCOM. The conversion unlocks Huffman-coded audio that CVU cannot provide.

How to convert CVU to HCOM

1

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

2

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

3

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

About formats

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
HCOM is a Huffman-coded audio format from the early Macintosh era, designed to shrink digitized sound for distribution on floppy disks and bulletin board systems when storage was precious and modems were slow. The encoder takes 8-bit unsigned PCM input, computes a frequency table of sample-delta values, and builds an optimal Huffman tree that replaces common deltas with short bit sequences. Compression ratios of 2:1 or better were typical for speech recordings, a meaningful saving when a 3.5-inch floppy held only 800 KB. Files were distributed as Macintosh resource forks and played through utilities like SoundApp and the BinHex ecosystem that defined Mac software exchange in the late 1980s. The format supported sample rates up to 22.255 kHz, matching the output capabilities of original Macintosh sound hardware. Tools such as SoX retain HCOM decoding support, ensuring that archived recordings remain accessible decades later. HCOM holds three practical advantages for preservation work: lossless compression that recovers the original samples exactly, a self-contained Huffman table embedded in each file for dependency-free decoding, and historical prevalence across thousands of vintage Mac sound archives.
Developer: Apple Computer
Initial release: 1985

Frequently Asked Questions

Why convert CVU to HCOM?

CVU suffers from outdated unprocessed telephony audio format. HCOM offers historical Mac format.

How do I open a HCOM audio?

You can open HCOM with SoX, vintage Macintosh software, and retro computing tools.

Is there quality loss from CVU to HCOM?

The source CVU audio has inherently low fidelity. HCOM conversion preserves what is there while adding broad compatibility.

Can I convert CVU to HCOM on any device?

Yes — the converter runs entirely in your browser, so it works on Windows, macOS, Linux, and mobile devices alike.

Can I convert multiple CVU recordings at once?

Yes — upload several CVU recordings simultaneously and they will all be converted to HCOM in parallel, saving you time.

Does CVU to HCOM conversion cost anything?

Standard conversions are available at no cost. Paid plans unlock higher limits and faster processing for heavy usage.