PRC to SOU Converter

Re-encode Psion PDA PRC audio as SOU online

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Format Conversion

Bridge PRC and SOU formats with a single click. Move audio from Psion PDA to mainstream compatibility.

Server-Side Encoding

Encoding happens in the cloud — your device stays free while our servers handle the PRC to SOU conversion.

Rapid Encoding

PRC files are compact — the conversion to SOU completes in just a few seconds on our servers.

How to convert PRC to SOU

1

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

2

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

3

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

About formats

PRC is an audio file format associated with Psion handheld organizers, particularly the Series 3 and Series 5 lines from the 1990s. These pocket computers included built-in microphones and basic voice recording capabilities, storing captured audio in the PRC container. The encoding is typically ADPCM-based (Adaptive Differential Pulse-Code Modulation), balancing file size against audio intelligibility given the severe storage constraints of early PDAs — the original Psion Series 3 had just 256 KB of RAM doubling as storage. PRC audio is generally mono at low sample rates (often 8 kHz), optimized for speech rather than music. One advantage was tight integration with the EPOC operating system (later evolving into Symbian), letting users embed voice notes directly in agenda entries and database records. The compact file sizes — a minute of speech consumed only a few kilobytes — made it feasible to store dozens of memos on devices with minimal memory. While PRC audio is a legacy format today, conversion tools exist for extracting recordings from archived Psion devices, which remain collectible among retro computing enthusiasts.
Developer: Psion PLC
Initial release: 1993
SOU is a raw audio format designation that functions as an alias for unsigned 8-bit PCM data (u8) in the SoX audio processing framework. Files with the .sou extension contain headerless, uncompressed audio samples stored as unsigned 8-bit integers — each byte represents a single amplitude value from 0 to 255, with 128 as the silence midpoint. Because there is no header, playback parameters such as sample rate and channel count must be specified externally. The default assumption is typically mono at 8000 Hz, though the data can represent any rate the recording hardware supported. The u8 encoding that SOU aliases is one of the simplest possible digital audio representations, predating structured audio containers like WAV and AIFF. Raw unsigned PCM was commonly produced by early sound cards and digitizers in the late 1980s and early 1990s, when storage constraints and limited processing power made headerless formats a practical choice. One advantage is absolute simplicity: SOU files can be read by any program capable of basic file I/O, with no parsing of container structures or metadata decoding required — useful for embedded systems, hardware diagnostics, and educational contexts where audio fundamentals are being explored. The format's minimal overhead also means that conversion to any modern container is lossless and instantaneous, since the raw PCM samples can be wrapped in a WAV or AIFF header without any transcoding.
Developer: SoX Contributors
Initial release: 1991

Frequently Asked Questions

Why convert PRC to SOU?

PRC is locked to obsolete Psion PDAs. SOU makes your recordings accessible on modern devices and standard audio software.

What applications open SOU files?

SOX and embedded systems can handle SOU files. Most are available as free downloads for major operating systems.

How is the SOU audio quality?

SOU provides good quality at standard settings. The output clarity depends on the original PRC recording quality.

How fast is the conversion?

Both formats produce manageable file sizes. The PRC to SOU conversion finishes almost instantly on our infrastructure.

Are my files kept private?

Your PRC files are erased after conversion completes. SOU downloads are purged from our servers within 24 hours automatically.

Do I need to register?

No account required. Upload your file, convert, and download the result directly from your browser at convertio.tools.