Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2008-05-20
2008-05-20
Nguyen, Quynh H. (Department: 2614)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S356000, C379S052000, C379S090010, C379S093050, C379S093080, C379S413020, C379S413030, C340S870030
Reexamination Certificate
active
07376127
ABSTRACT:
A system for reconstructing missing packets in a packetized audio TTY stream that includes:(a) an input328operable to receive a plurality of first packets, each comprising one or more TTY tones in a sequence of TTY tones; and(b) a processor332operable to:(i) order the packets;(ii) depacketize the TTY tones in the plurality of first packets;(iii) determine when a TTY tone is missing from the sequence of TTY tones;(iv) when a TTY tone is missing, perform at least one of the following steps:(1) determine the a TTY tone based on a portion of the tone contained in an adjacent packet; and(2) determine the a TTY tone based on one of(i) a random or pseudo-random tone selection, (ii) a comparison of a first probability associated with a first TTY character generated from a first tone substituted for the missing a TTY tone with a second probability associated with a second TTY character generated from a second tone substituted for the missing TTY tone, and/or (iii) a comparison of a first ordering of TTY characters comprising the first TTY character and a second ordering of TTY characters comprising the second TTY character with a library of TTY character orderings.
REFERENCES:
patent: 6421425 (2002-07-01), Bossi et al.
patent: 6504910 (2003-01-01), Engelke et al.
patent: 6603835 (2003-08-01), Engelke et al.
patent: 6611804 (2003-08-01), Dorbecker et al.
patent: 6625259 (2003-09-01), Hollatz et al.
patent: 6842503 (2005-01-01), Wildfeuer
patent: 6961320 (2005-11-01), Swaminathan et al.
patent: 7027986 (2006-04-01), Caldwell et al.
U.S. Appl. No. 10/192,978, filed Jul. 10, 2002, Michaelis.
“Access for 9-1-1 and Telephone Emergency Services,” Americans with Disabilities Act, U.S. Department of Justice, Civil Rights Division (Jul. 15, 1998), available at http://www.usdoj.gov/crt/ada/911ta.htm, 11 pages.
H. Schulzrinne et al., “RFC 2833—RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals,” Network Working Group Request for Comments 2833 (May 2000), available at http://www.faqs.org/rfcs/rfc2833.html, 23 pages.
G. Hellstrom et al., “RFC 2793—RTP Payload for Text Conversation,” Network Working Group Request for Comments 2793 (May 2000), available at http://www.faqs.org/rfcs/rfc2793.html, 8 pages.
Hepworth Neil
Michaelis Paul Roller
Avaya Technology Corp.
Nguyen Quynh H.
Sheridan & Ross P.C.
LandOfFree
Methods for reconstructing missing packets in TTY over voice... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods for reconstructing missing packets in TTY over voice..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods for reconstructing missing packets in TTY over voice... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2793303