WV to SLN Converter

Decode WavPack into Asterisk SLN signed linear audio

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Asterisk PBX Audio

Create crystal-clear SLN prompts from WavPack lossless — the best source for professional-sounding IVR greetings.

Sample Rate Control

Choose 8 kHz or 16 kHz to match your Asterisk PBX configuration precisely.

Secure Processing

WV uploads are deleted immediately. SLN files are removed within 24 hours.

How to convert WV to SLN

1

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

2

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

3

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

About formats

WavPack is an open-source audio codec created by David Bryant, with version 1.0 released on August 15, 1998. What sets WavPack apart is its unique hybrid mode: the encoder can simultaneously produce a compact lossy file and a separate correction file that, when combined, reconstruct the original PCM stream bit-for-bit. Users who need portability carry just the lossy file; those who want archival quality keep both. The codec handles PCM audio from 8-bit to 32-bit integer and 32-bit floating point, with sample rates up to 768 kHz — specifications broad enough for DSD content, which WavPack 5 added support for. Compression ratios in pure lossless mode typically reach 40 to 55 percent of the original size, competitive with FLAC and often slightly better on certain material. Multicore encoding in later versions dramatically speeds up processing on modern hardware. The open-source library ships under a BSD license and has been integrated into foobar2000, VLC, FFmpeg, and numerous other tools. WavPack also supports rich metadata through APEv2 tags, embedded cue sheets, and ReplayGain values, covering the organizational needs of even the most meticulous music library.
Developer: David Bryant
Initial release: August 15, 1998
SLN (Signed Linear) is a headerless raw audio format storing 16-bit signed linear PCM samples at 8000 Hz mono, most closely associated with Asterisk — the open-source PBX framework developed by Digium (now Sangoma Technologies). Within Asterisk, SLN serves as the native internal audio representation: every codec transcoding operation passes through signed linear as an intermediate step. This makes SLN the backbone of Asterisk's codec translation architecture. The format contains nothing but raw samples — no headers, no metadata, no framing — so parameters must be known in advance. While this lack of self-description might seem limiting, it is actually an advantage in telephony where sample format is fixed by convention and every overhead byte matters across thousands of simultaneous channels. The 8000 Hz rate aligns with the G.711 standard for traditional telephony, capturing the full 300-3400 Hz voice band. Asterisk also supports extended variants (sln16, sln32, sln48) for wideband audio. SLN files require no decoding — just direct memory mapping — making them ideal for real-time mixing, conferencing, and prompt playback in high-density VoIP environments.
Initial release: 1999

Frequently Asked Questions

Why convert WV to SLN?

SLN is the native raw audio for Asterisk PBX. Lossless WavPack gives you the cleanest IVR prompts and hold music.

What sample rate does Asterisk use?

Standard Asterisk uses 8 kHz. Wideband setups may use 16 kHz for improved voice clarity.

What is SLN?

SLN stores headerless signed linear PCM audio — the format Asterisk expects for voice prompts and greetings.

Can I use SLN for IVR?

Yes — SLN is the preferred format for Asterisk auto-attendant greetings, IVR menus, and on-hold audio.

Is it free?

Yes — WV to SLN is free on convertio.tools.