SPH to SMP Converter

Reliable SPH to SMP conversion in seconds

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File Privacy

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

Audio Accuracy

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

Platform-Free

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

How to convert SPH to SMP

1

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

2

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

3

Let the file convert and you can download your smp 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
SMP is the native file format of SampleVision, a sample editing application developed by Turtle Beach Systems around 1990. SampleVision was among the first PC-based visual sample editors, letting musicians view waveforms on screen and perform cut, copy, paste, and loop-point editing — capabilities previously limited to expensive dedicated hardware samplers. The SMP format stores 16-bit mono PCM audio along with sampling-specific metadata: loop start and end points, sustain loops, release loops, and MIDI root note assignments. This made SMP files directly useful for creating and exchanging patches between hardware samplers via MIDI Sample Dump Standard (SDS) transfers, which SampleVision automated through its interface. A primary advantage was bridging the PC world with professional sampling hardware from Akai, E-mu, Ensoniq, and Roland — devices that had tiny screens and minimal editing tools. The format also supported common sample rates (22050, 44100 Hz) and brief text descriptions alongside audio data. Though Turtle Beach pivoted to gaming peripherals and SampleVision was discontinued, SMP files persist in vintage sample library archives and can be converted using SoX.
Initial release: 1990

Frequently Asked Questions

Why convert SPH to SMP?

SPH recordings cannot load into hardware samplers. SMP is the Turtle Beach SampleVision format for transferring samples to hardware.

What can open SMP audio?

Open SMP with SoX or Turtle Beach SampleVision sampling editors.

How secure is SPH to SMP conversion?

Complete security — your SPH recordings are wiped after processing. All SMP downloads are cleared within 24 hours.

Does the SPH to SMP converter need installation?

Zero installation needed. The SPH to SMP tool is browser-based and works on any device with internet access.

How quickly does SPH to SMP conversion finish?

Speed is excellent. Our cloud engine converts SPH to SMP rapidly, with typical audio files processed in under a minute.

What devices can I use for SPH to SMP conversion?

The converter is platform-independent. Use it on desktops, laptops, tablets, or phones — any browser on any OS.