VOX to FAP Converter

Transform Dialogic VOX recordings into FAP audio

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Research Input

FAP serves specialized audio research. Converting VOX creates data for your analysis pipeline.

Cloud Encoding

No local tools needed. Convert VOX to FAP directly online.

Secure Processing

VOX uploads are deleted immediately. FAP outputs purged within 24 hours.

How to convert VOX to FAP

1

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

2

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

3

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

About formats

VOX is a headerless audio format built around Dialogic ADPCM encoding, widely adopted in telephony, interactive voice response (IVR) systems, and voice mail platforms since the 1980s. Each audio sample is compressed into 4 bits using an algorithm developed by Oki Electric and implemented in hardware on Dialogic Corporation's telephony interface cards. VOX files typically use a sampling rate of 6000 or 8000 Hz, producing extremely compact recordings optimized for speech intelligibility rather than musical fidelity. Because the format carries no header, playback software must know the sample rate and encoding parameters in advance — a trade-off that reduces overhead but demands careful file management. The primary advantage of VOX is storage efficiency: a one-minute voice recording at 8 kHz occupies roughly 240 KB, making it practical for systems storing thousands of prompts. Dialogic ADPCM conforms to the ITU-T G.726 standard, ensuring interoperability across telephony equipment from different vendors. Even as modern call centers migrate to IP-based systems with codecs like Opus, vast libraries of VOX recordings persist in legacy IVR deployments and compliance archives worldwide.
Initial release: 1983
FAP is a byte-swapped variant of the PAF (Paris Audio File) format associated with the Ensoniq PARIS digital audio workstation, a recording environment popular among project-studio engineers in the late 1990s. Where standard PAF stores sample data in big-endian order, FAP reverses the byte layout for little-endian architectures, enabling direct memory mapping on Intel-based processors without a runtime byte-swap penalty. The underlying payload is uncompressed linear PCM at up to 24-bit depth and 96 kHz sampling, preserving full studio-grade fidelity. Because there is no lossy coding stage, recordings survive unlimited edit cycles with zero generational loss — a critical property during tracking and mixing. The SoX command-line utility maintains read/write support for FAP, making it the most accessible tool for converting legacy PARIS sessions to modern formats. Despite its niche origins, FAP demonstrates solid engineering: the header is minimal and deterministic, eliminating ambiguity that sometimes plagues chunk-based containers. Advantages include bit-perfect audio preservation, fast I/O on x86 hardware due to native byte order, and straightforward interoperability with raw PCM tools.
Developer: Ensoniq
Initial release: 1998

Frequently Asked Questions

Why convert VOX to FAP?

FAP is a raw audio format for signal processing research. Converting Dialogic VOX telephony recordings to FAP feeds them into specialized analysis pipelines.

How do I open FAP files?

SoX is the primary tool for reading and processing FAP audio. Specialized research platforms and signal analysis scripts can also handle FAP data directly.

Is audio quality lost during VOX to FAP conversion?

No — audio data transfers from VOX to FAP without additional degradation. The result preserves the same fidelity as the decoded Dialogic ADPCM stream.

Is VOX to FAP conversion free?

Yes — converting VOX to FAP is free for standard use on convertio.tools. Premium plans unlock higher processing volumes and priority server access.

Are my VOX recordings stored on servers?

No. VOX uploads are permanently deleted as soon as conversion finishes. FAP output is automatically purged within 24 hours to protect your data.