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Switchboard-1 Release 2
4.6
Paid Researchers praise Switchboard-1 Release 2 for its high-quality conversational speech data and its utility in training speech recognition and speaker identification systems.
A large conversational telephone speech corpus for speech recognition and speaker identification research.
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Refined 2/22/2026
About Switchboard-1 Release 2
Switchboard-1 Release 2 is a corpus of approximately 260 hours of conversational telephone speech developed by Texas Instruments and distributed by the Linguistic Data Consortium (LDC). It comprises around 2,400 two-sided telephone conversations among 543 speakers from across the United States. The data was collected using a computer-driven robot operator system which introduced topics for discussion and recorded speech from both participants into separate channels. This release corrects errors from the original NIST publication (Release 1) and includes modifications to the NIST Sphere headers for consistency. The ISIP update of phonetic transcriptions developed by the International Computer Science Institute (ICSI) and corrected word alignments are available at ISIP. Researchers leverage this data for annotation projects, discourse analysis, part-of-speech tagging, and phonetic transcriptions. The corpus includes speaker attribution tables, updated file lists, and documentation.
Core Capabilities
Switchboard-1 Release 2 is a corpus of approximately 260 hours of conversational telephone speech developed by Texas Instruments and distributed by the Linguistic Data Consortium (LDC).
