@patent{rathi@13,
	author={Rathinavelu Chengalvarayan, et al},
	institution={{US7881929B2}},
	month={February},
	title={Ambient noise injection for use in speech recognition},
	url={http://www.research.att.com/export/sites/att_labs/people/Chengalvarayan_Rathinavelu/library/patents/US7881929B2.pdf},
	year=2011,
}