Speakers

A total of 36 subjects participated to the collection of the corpus. We recorded the bulk of the corpus (28 speakers) within a single dialect, in order to raise the bar for forensic speaker identification. We also included a few out-of-dialect speakers (8) for comparison. The 36 speakers are divided as follows:

• 1 female from the United Kingdom
• 3 females from the USA
• 2 males from the United Kingdom
• 2 males from the USA
• 12 females from the Eastern part of Ireland (Dublin and adjacent counties)
• 16 males from the Eastern part of Ireland (Dublin and adjacent counties)

Participants were recruited through the university, and were paid for their participation. No participant had any known speech or hearing deficit. Table 1 provides the dialect of each participant, gender, and the speaker ID.

Table 1: Speakers ID, Gender and Dialect

SpeakerID	Gender	Dialect	SpeakerID	Gender	Dialect
frf01	female	California - USA	frm01	male	East Anglia - UK
frf02	female	California - USA	frm02	male	Bedfordshire - UK
frf03	female	Indiana - USA	frm03	male	Virginia - USA
frf04	female	Midlands - UK	frm04	male	New England - USA
irf01	female	Co. Dublin - IE	irm01	male	Co. Dublin - IE
irf02	female	Co. Dublin - IE	irm02	male	Co. Dublin - IE
irf03	female	Co. Dublin - IE	irm03	male	Co. Dublin - IE
irf04	female	Co. Dublin - IE	irm04	male	Co. Dublin - IE
irf05	female	Co. Dublin - IE	irm05	male	Co. Dublin - IE
irf06	female	Co. Dublin - IE	irm06	male	Co. Dublin - IE
irf07	female	Co. Dublin - IE	irm07	male	Co. Dublin - IE
irf08	female	Co. Dublin - IE	irm08	male	Co. Dublin - IE
irf09	female	Co. Dublin - IE	irm09	male	Co. Dublin - IE
irf10	female	Co. Dublin - IE	irm10	male	Co. Dublin - IE
irf11	female	Co. Dublin - IE	irm11	male	Co. Dublin - IE
irf12	female	Co. Dublin - IE	irm12	male	Co. Dublin - IE
			irm13	male	Co. Dublin - IE
			irm14	male	Co. Dublin - IE
			irm15	male	Co. Dublin - IE
			irm16	male	Co. Dublin - IE

In the SYNCHRONOUS condition two subjects read a prepared text in synchrony with one another. Speakers were paired as described in table 2.

Table 2: Speakers Coupling in the Synchronous Condition

Non-Irish Females	Non-Irish Males	Irish Females	Irish Males
frf01-frf02	frm01-frm02	irf01-irf02	irm01-irm02
frf03-frf04	frm03-frm04	irf03-irf04	irm03-irm04
-	-	irf05-irf06	irm05-irm06
-	-	irf07-irf08	irm07-irm08
-	-	irf09-irf10	irm09-irm10
-	-	irf11-irf12	irm11-irm12
-	-	-	irm13-irm14
-	-	-	irm15-irm16

In the RSI condition, each male speaker used the same target: the recordings of irm05 obtained in the SOLO condition. Similarly, each female speaker used the recordings of irf05 (obtained in the SOLO condition) as target.