SPH to OGG Converter

Reliable SPH to OGG conversion in seconds

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Settings

The codec to encode the audio track. Codec "Without reencoding" copies the audio stream from the input file into output without re-encoding if possible.
Set the Vorbis encoder audio quality level. The scale is non-linear. The "Auto" mode produces roughly 112 kbps bitrate and is good in most cases.
Set the number of audio channels. This setting is most useful when downmixing channels (e.g., from 5.1 to stereo).

sph

SPH is the file extension for audio stored in the NIST SPHERE (SPeech HEader REsources) format, a standard created by the U.S. National Institute of Standards and Technology around 1990. Built for speech research, SPH files carry a 1024-byte ASCII header packed with metadata — database identifiers, channel counts, sample rates, byte ordering, and compression type — making every recording self-describing. The underlying audio is typically 16-bit linear PCM sampled at 16 kHz, though other configurations are permitted. Researchers at NIST, DARPA, and universities worldwide rely on SPH for distributing speech corpora such as TIMIT, Switchboard, and the LDC collections that underpin modern automatic speech recognition systems. A key advantage is that the human-readable header lets scripts parse recording metadata without binary decoding. The format's strict standardization also eliminates ambiguity when sharing datasets across institutions and platforms. Because SPH files store uncompressed PCM, they preserve full audio fidelity — critical when training acoustic models where even small artifacts can skew results.
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ogg

OGG Vorbis is an open, royalty-free lossy audio codec inside the Ogg container format, both developed by the Xiph.Org Foundation. Vorbis was designed as a patent-free alternative to MP3 and AAC, using modified discrete cosine transform (MDCT) coding with variable bitrate encoding that adapts to signal complexity per frame. Blind listening tests have consistently shown Vorbis delivering perceptual quality matching or exceeding MP3, especially in the 96-192 kbps range. The format supports sample rates from 8 kHz to 192 kHz and 1 to 255 channels, covering everything from mono voice to surround mixes. A standout advantage is the complete absence of licensing fees — game developers, streaming platforms, and hardware makers can implement Vorbis without royalty concerns. Spotify relied on Vorbis for years as its primary streaming codec for exactly this reason. The format also handles quality degradation at low bitrates more gracefully than many competitors, which is why it remains popular in video games where storage is tight and thousands of sound effects compete for space. VLC, Firefox, Chrome, and Android all provide native Vorbis decoding.
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File Privacy

Your SPH recordings are deleted right after conversion. All OGG results are purged from our servers automatically within 24 hours.

Audio Accuracy

SPH to OGG conversion preserves audio fidelity. Sample rates and bit depths are handled precisely for accurate output.

Platform-Free

Run the SPH to OGG converter on any operating system through a standard web browser. Desktop and mobile both work.

How to convert SPH to OGG

1

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

2

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

3

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

About formats

SPH is the file extension for audio stored in the NIST SPHERE (SPeech HEader REsources) format, a standard created by the U.S. National Institute of Standards and Technology around 1990. Built for speech research, SPH files carry a 1024-byte ASCII header packed with metadata — database identifiers, channel counts, sample rates, byte ordering, and compression type — making every recording self-describing. The underlying audio is typically 16-bit linear PCM sampled at 16 kHz, though other configurations are permitted. Researchers at NIST, DARPA, and universities worldwide rely on SPH for distributing speech corpora such as TIMIT, Switchboard, and the LDC collections that underpin modern automatic speech recognition systems. A key advantage is that the human-readable header lets scripts parse recording metadata without binary decoding. The format's strict standardization also eliminates ambiguity when sharing datasets across institutions and platforms. Because SPH files store uncompressed PCM, they preserve full audio fidelity — critical when training acoustic models where even small artifacts can skew results.
Initial release: 1990
OGG Vorbis is an open, royalty-free lossy audio codec inside the Ogg container format, both developed by the Xiph.Org Foundation. Vorbis was designed as a patent-free alternative to MP3 and AAC, using modified discrete cosine transform (MDCT) coding with variable bitrate encoding that adapts to signal complexity per frame. Blind listening tests have consistently shown Vorbis delivering perceptual quality matching or exceeding MP3, especially in the 96-192 kbps range. The format supports sample rates from 8 kHz to 192 kHz and 1 to 255 channels, covering everything from mono voice to surround mixes. A standout advantage is the complete absence of licensing fees — game developers, streaming platforms, and hardware makers can implement Vorbis without royalty concerns. Spotify relied on Vorbis for years as its primary streaming codec for exactly this reason. The format also handles quality degradation at low bitrates more gracefully than many competitors, which is why it remains popular in video games where storage is tight and thousands of sound effects compete for space. VLC, Firefox, Chrome, and Android all provide native Vorbis decoding.
Initial release: May 1, 2000

Frequently Asked Questions

Why convert SPH to OGG?

SPH files are not recognized by consumer audio software. OGG Vorbis provides open-source lossy compression with excellent quality at low bitrates.

What can open OGG audio?

Open OGG with VLC, foobar2000, Firefox, Chrome, Audacity, or any Vorbis-capable player.

Can I change audio settings before converting SPH to OGG?

You can customize sample rate, bit depth, and channel layout in the settings panel before converting SPH to OGG.

Is SPH to OGG conversion lossless?

It depends on the target. Converting SPH to a lossless OGG format keeps all data. Lossy codecs trade minor quality for smaller size.

Can I convert many SPH files to OGG in one batch?

Batch conversion is available. Drop multiple SPH recordings into the converter and process them all to OGG in one pass.

How secure is SPH to OGG conversion?

Fully secure. SPH uploads are removed immediately post-conversion, and OGG results are automatically purged within 24 hours.