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Multi-Language Conversational Telephone Speech 2014 - Spanish & Portuguese

Item Name:	Multi-Language Conversational Telephone Speech 2014 - Spanish & Portuguese
Author(s):	Karen Jones, Stephanie Strassel, Kevin Walker, David Graff, Jonathan Wright
LDC Catalog No.:	LDC2026S07
ISLRN:	413-326-952-440-2
DOI:	https://doi.org/10.35111/91wg-j527
Release Date:	June 15, 2026
Member Year(s):	2026
DCMI Type(s):	Sound
Sample Type:	flac
Sample Rate:	8000
Data Source(s):	telephone conversations
Project(s):	NIST LRE
Application(s):	language identification
Language(s):	Spanish, Portuguese
Language ID(s):	spa, por
License(s):	LDC User Agreement for Non-Members
Online Documentation:	LDC2026S07 Documents
Licensing Instructions:	Subscription & Standard Members, and Non-Members
Citation:	Jones, Karen, et al. Multi-Language Conversational Telephone Speech 2014 - Spanish & Portuguese LDC2026S07. Web Download. Philadelphia: Linguistic Data Consortium, 2026.
Related Works: Hide	View hasOutcome LDC2022S10 2017 NIST Language Recognition Evaluation Training and Development Sets LDC2025S02 2015 NIST Language Recognition Evaluation Test Set isSimilarWith LDC96S35 CALLHOME Spanish Speech LDC96S57 CALLFRIEND Spanish-Caribbean Dialect LDC96S58 CALLFRIEND Spanish-Non-Caribbean Dialect LDC2016S11 Multi-Language Conversational Telephone Speech 2011 -- Slavic Group LDC2017S09 Multi-Language Conversational Telephone Speech 2011 -- Turkish LDC2017S14 Multi-Language Conversational Telephone Speech 2011 -- South Asian LDC2018S03 Multi-Language Conversational Telephone Speech 2011 -- Central Asian LDC2018S08 Multi-Language Conversational Telephone Speech 2011 -- Central European LDC2018S12 Multi-Language Conversational Telephone Speech 2011 -- Spanish LDC2020S05 Multi-Language Conversational Telephone Speech 2011 -- Mandarin Chinese LDC2026S04 CALLHOME Spanish Second Edition

Introduction

Multi-Language Conversational Telephone Speech 2014 - Spanish & Portuguese was developed by the Linguistic Data Consortium (LDC) and is comprised of approximately 123.8 hours of telephone speech in Spanish and Portuguese.

The data was collected primarily to support research and technology evaluation in automatic language identification; portions of these recordings were used in the NIST 2015 and 2017 language recognition evaluations. The collection focused on language pair discrimination for 20 languages/dialects, some of which could be considered mutually intelligible or closely related.

Data

This corpus contains 569 recordings covering Brazilian Portuguese, Caribbean Spanish, European Spanish and Latin American Spanish. Participants were recruited by native speakers who contacted acquaintances in their social networks. Those native speakers made one call, up to 8 minutes, to each acquaintance. The data was collected using LDC's telephone collection infrastructure. Human auditors labeled calls for language, quality, callee gender, dialect type and noise.

All audio data is presented in FLAC-compressed MS-WAV (RIFF) file format (*.flac); when uncompressed, each file is 2 channels, recorded at 8000 samples/second with samples stored as 16-bit signed integers, representing a lossless conversion from the original mu-law sample data as captured digitally from the public telephone network. The following table summarizes the total number of calls, total number of hours of recorded audio, and the total size of compressed data:

Group	Lanugage	Calls	Hours	Size (GB)
Portuguese	Portuguese - Brazillian	20	4.78	0.26
Spanish	Spanish - Carribean	105	23.69	1.16
Spanish	Spanish - Europe	205	44.20	0.26
Spanish	Spanish - Latin America	239	51.13	2.51

Multi-Language Conversational Telephone Speech 2014 - Spanish & Portuguese

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