TTA to SPH Converter
Transform True Audio into NIST Sphere SPH online
Corpus Standard
NIST Sphere is the established speech corpus format — lossless TTA gives researchers pristine audio data.
Research Ready
SPH integrates with Kaldi, HTK, and Praat — key tools for speech recognition and linguistic analysis.
Data Protection
TTA uploads and SPH outputs are handled securely — source deleted immediately, results within 24 hours.
How to convert TTA to SPH
Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.
Choose sph or any other format you need as a result (more than 200 formats supported)
Let the file convert and you can download your sph file right afterwards
About formats
Frequently Asked Questions
SPH (NIST Sphere) is the audio format from NIST used for distributing speech corpora and linguistic research data.
Speech research databases use NIST Sphere. Lossless TTA provides clean speech recordings for the corpus.
Praat, HTK, Kaldi, NIST tools, and speech recognition frameworks handle SPH for linguistic research.
SPH supports uncompressed PCM — lossless TTA quality is fully preserved in the conversion.
TTA uploads are deleted immediately. SPH corpus files are removed within 24 hours.