SPX to PRC Converter

Convert Speex voice audio to Psion PRC recording format

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Legacy Device Support

Convert SPX recordings to PRC for playback on Psion handheld devices and other EPOC-based personal organizers.

Online Conversion

No need to find obscure Psion utilities — convert SPX to PRC directly in your browser using our cloud service.

Secure Processing

SPX uploads are deleted after conversion. PRC outputs are removed from servers within 24 hours.

How to convert SPX to PRC

1

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

2

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

3

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

About formats

Speex is an open-source audio codec purpose-built for speech compression, developed by Jean-Marc Valin under the Xiph.Org Foundation. First released in October 2002, it targets voice-over-IP, conferencing, and any scenario where spoken word needs to travel efficiently over a network. SPX files wrap Speex-encoded audio inside an Ogg container, pairing the codec's speech optimization with Ogg's streaming capabilities. Three sampling rates are supported — narrowband at 8 kHz, wideband at 16 kHz, and ultra-wideband at 32 kHz — along with variable bitrate encoding that adapts in real time to speech complexity. A standout advantage is its patent-free, BSD-licensed nature, which allowed developers to embed it freely in both commercial and open-source products. Speex also bundles acoustic echo cancellation, noise suppression, and automatic gain control, features that rival codecs typically delegate to external libraries. Although its creators officially recommend Opus as a successor since 2012, Speex remains deployed in legacy VoIP systems, archived recordings, and embedded devices where its lightweight decoder footprint is still valued.
Initial release: October 15, 2002
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

Frequently Asked Questions

Why convert SPX to PRC?

PRC is native to Psion handheld devices. Converting from SPX allows playback on these classic personal organizers.

What devices use PRC?

Psion Series 5, Revo, netBook, and other Psion EPOC devices support PRC as their native audio recording format.

Can modern software open PRC?

SOX and a few specialized tools can decode PRC files. Converting to WAV afterward is recommended for general use.

Is the quality sufficient for voice?

PRC is voice-grade by design. Your SPX speech recordings will convert without noticeable quality issues.

Is the conversion free?

Yes — SPX to PRC conversion is free on convertio.tools.