@patent{rathi@5,
	author={Rathinavelu Chengalvarayan, et al},
	institution={{US6606595}},
	month={Ausuat},
	title={HMM-based echo model for noise cancellation avoiding the problem of false triggers},
	url={http://www.research.att.com/export/sites/att_labs/people/Chengalvarayan_Rathinavelu/library/patents/US6606595.pdf},
	year=2003,
}