GSM to MAUD Converter

Encode GSM telephony audio into Amiga MAUD format online

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Amiga Audio Format

Bring GSM telephony speech into the MAUD format — a 16-bit Amiga audio standard for retro computing and historical preservation.

No Special Tools

Skip installing SoX or Amiga utilities. The GSM to MAUD conversion runs entirely in your browser through our servers.

Private Processing

Uploaded GSM recordings are erased after conversion. MAUD outputs are purged from servers within 24 hours.

How to convert GSM to MAUD

1

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

2

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

3

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

About formats

GSM 06.10 (Full Rate) is the foundational speech codec of the Global System for Mobile Communications standard, ratified by ETSI in 1991 and deployed across hundreds of cellular networks worldwide. Operating at a fixed 13 kbit/s, the algorithm applies Regular Pulse Excitation with Long-Term Prediction (RPE-LTP) to compress 20 ms frames of 8 kHz mono speech into just 33 bytes each. This approach models the vocal tract as a linear predictive filter, encodes the excitation signal, and leverages pitch periodicity for further reduction — tuned to deliver intelligible voice under the bandwidth constraints of early digital mobile channels. The codec powers not only GSM telephony but also many VoIP applications, voicemail systems, and IVR platforms that benefit from its low bitrate. Three concrete advantages stand out. First, extraordinary compression: one minute of speech fits in roughly 100 KB, enabling efficient storage and transmission. Second, universal tooling — libraries such as libgsm and SoX handle encoding and decoding on every major platform. Third, a royalty-free patent landscape that has encouraged adoption across open-source telephony projects like Asterisk and FreeSWITCH.
Initial release: 1991
MAUD is an audio file format developed by MacroSystem for the Commodore Amiga platform, introduced in the early 1990s as part of their digital video and audio production tools. Built on the Amiga IFF (Interchange File Format) chunk architecture, MAUD files organize data into clearly delineated chunks — MHDR for the header, MDAT for sample data, and optional annotation chunks for metadata. The format supports mono and stereo layouts with bit depths of 8 or 16 bits and sample rates up to 48 kHz, which represented professional-grade specifications on Amiga hardware. Both signed linear PCM and A-law/mu-law encodings are available, offering a choice between fidelity and file size. MAUD saw primary use in the Amiga video production community, where MacroSystem Retina and VLab Motion boards demanded synchronized audio that the standard 8SVX format could not deliver. Conversion support exists today through SoX and libsndfile, ensuring vintage Amiga productions remain recoverable. Three distinct advantages stand out: clean IFF-based structure that any chunk-aware parser can navigate, 16-bit stereo capability ahead of typical Amiga audio, and lightweight overhead that left maximum CPU headroom for video rendering.
Initial release: 1992

Frequently Asked Questions

Why convert GSM to MAUD?

MAUD is an Amiga 16-bit audio format. Converting is useful for Amiga emulation projects or preserving audio in period-correct formats.

What can open MAUD files?

Amiga emulators, SoX, and specialized retro computing tools can open MAUD files for playback and further manipulation.

Is MAUD better quality than GSM?

MAUD supports 16-bit audio while GSM is heavily compressed speech. The container supports better quality, though the source limits the output.

How large will the MAUD file be?

MAUD stores uncompressed 16-bit audio, so files are larger than GSM but still small for short speech recordings.

Are my files handled securely?

GSM uploads are deleted immediately. MAUD results are automatically removed from our servers within 24 hours.