WVE to CVS Converter

Transform Psion WVE audio into CVSD telephony

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

PDA Audio Rescued

Extract audio from legacy Psion WVE files and convert to CVS — make vintage PDA recordings accessible in a supported format.

No PsiWin Needed

Convert WVE files without PsiWin or SoX. The entire process runs in your web browser on any operating system.

Secure Processing

Uploaded WVE files are deleted immediately after conversion. Output files are purged from our servers within 24 hours.

How to convert WVE to CVS

1

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

2

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

3

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

About formats

WVE is the audio format native to the Psion Series 3 family of personal digital assistants, released by British company Psion PLC beginning in September 1991. These clamshell PDAs included a built-in voice recorder, and all dictation functionality relied on WVE files to store captured sound. Each file begins with the ASCII signature "ALawSoundFile**" followed by a minimal header, then raw A-law encoded audio sampled at 8 kHz — a rate inherited from digital telephony standards. At 8000 bytes per second, a one-minute recording occupies just 480 KB, which was essential given that Psion devices stored data on SRAM cards typically ranging from 128 KB to 2 MB. The A-law encoding provides reasonable speech clarity within these tight storage constraints, prioritizing intelligibility over high-fidelity reproduction. WVE files can be converted to WAV or other modern formats using SoX, Awave Studio, or specialized Psion file utilities. While the format is firmly a product of early-1990s handheld computing, it holds historical significance as one of the first audio recording formats designed for pocket-sized consumer devices. Collectors and researchers studying mobile computing history occasionally encounter WVE files when recovering data from legacy SRAM media.
Developer: Psion PLC
Initial release: 1991
CVS is a telephony audio encoding based on Continuously Variable Slope Delta modulation, representing voice through a 1-bit delta scheme where step size adapts to track input amplitude. Developed within CCITT (now ITU-T) standards during the 1970s, CVS encodes by comparing each sample to the previous one and outputting a single bit — up or down — with slope magnitude adjusting based on recent bit patterns. This yields extremely low bit rates, typically 16 kbps at 8 kHz sampling, efficient for narrowband voice over constrained channels. CVS files store signed delta-encoded data and are commonly processed using tools like SoX. A significant advantage is bandwidth economy: the 1-bit-per-sample approach demands minimal transmission capacity, essential for military radio links and early digital telephone infrastructure. The adaptive slope mechanism also prevents overload distortion on rapidly changing signals while keeping granular noise acceptable during quiet passages. Though modern wideband codecs have superseded CVS, it retains historical importance and niche utility in legacy telephony and embedded communication devices.
Developer: CCITT / ITU-T
Initial release: 1970

Frequently Asked Questions

Why convert WVE to CVS?

CVS uses CVSD modulation for military voice. Converting WVE targets specialized secure communication.

What can open CVS files?

SoX and military telephony systems process CVS.

What is the WVE format?

WVE is the native audio format of Psion PDA devices (Series 3, 5, Revo). It stores 8-bit A-law encoded audio — a legacy from the EPOC operating system.

Can modern systems play WVE?

SoX and PsiWin on Windows can process WVE files. Standard media players do not support it — conversion is the easiest path to playback.

Can I convert multiple WVE files?

Yes. Upload several Psion recordings and batch-convert them all at once — efficient for archiving an entire PDA audio library.