Portuguese (Brazil) conversational telephony PTB_ASR002 false Conversational Speech Brazil Portuguese 33 hours 2013 pr-BR Dataset is fully transcribed and time stamped;Dataset is accompanied by a pronunciation lexicon containing all transcribed words ; 63% landline, 38% mobile General / not domain-specific (read speech, digits, names, command & control) Stereo 8 alaw or wav Mobile phone and landline Low background noise Appen Global