Telephonic communications – Echo cancellation or suppression
Reexamination Certificate
2005-11-29
2005-11-29
Tran, Sinh (Department: 2644)
Telephonic communications
Echo cancellation or suppression
C379S406030, C379S406050, C379S406060, C379S406090, C379S406080
Reexamination Certificate
active
06970558
ABSTRACT:
Device and method for noise suppression in telephone equipment, in particular with hands-free equipment, having a level discriminator, an additional filter with a group propagation time of less than 2 ms being inserted into the transmission and receiving paths of the telephone equipment.
REFERENCES:
patent: 5574824 (1996-11-01), Slyh et al.
patent: 5757937 (1998-05-01), Itoh et al.
patent: 5933495 (1999-08-01), Oh
patent: 0 804 011 (1997-10-01), None
Infineon - Technologies AG
Jenkins & Wilson & Taylor, P.A.
Singh Ramnandan
Tran Sinh
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