EP 1198934 A1 20020424 - METHOD AND APPARATUS SUPPORTING TDD/TTY MODULATION OVER VOCODED CHANNELS
Title (en)
METHOD AND APPARATUS SUPPORTING TDD/TTY MODULATION OVER VOCODED CHANNELS
Title (de)
VERFAHREN UND EINRICHTUNG FÜR TDD/TTY MODULATION ÜBER SPRACH-KODIERTE KANÄLE
Title (fr)
PROCEDE ET DISPOSITIF ACCEPTANT LA MODULATION TDD/TTY SUR DES VOIES TELEPHONIQUES EQUIPEES EN VOCODEUR
Publication
Application
Priority
- US 0021441 W 20000803
- US 36671499 A 19990804
Abstract (en)
[origin: WO0111840A1] A method used to encode/decode a low activity communication signal - such as a Baudot tone - for transmission over a telecommunications system (100). The telecommunications system (100) may include any number of wireless links. Once the system (100) is noticed that a low activity signal needs to be transmitted, each vocoder used in the system (100) to encode/decode the signal performs a unique encoding/decoding process. In one embodiment, frames containing errors adversely affecting a signal are delivered to the vocoder and the "soft bits" contained therein are used to determine the original signal transmitted. In another embodiment, encoding of the signal may include encoding the signal using redundancy with the encoded signal being spread across multiple vocoder frames.
IPC 1-7
IPC 8 full level
H04B 7/26 (2006.01); H04J 3/00 (2006.01); H04L 1/08 (2006.01); H04L 12/56 (2006.01); H04L 17/00 (2006.01); H04L 29/06 (2006.01); H04M 1/247 (2006.01); H04M 1/72478 (2021.01); H04M 11/00 (2006.01); H04W 48/08 (2009.01); G10L 19/00 (2006.01); G10L 19/005 (2013.01); H04Q 7/30 (2006.01); H04W 28/04 (2009.01)
CPC (source: EP KR)
G10L 19/005 (2013.01 - KR); H04L 1/00 (2013.01 - KR); H04L 1/08 (2013.01 - EP); H04M 1/72478 (2021.01 - EP); H04W 48/08 (2013.01 - EP); H04W 72/00 (2013.01 - KR); G10L 19/005 (2013.01 - EP)
Citation (search report)
See references of WO 0111840A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0111840 A1 20010215; AU 6523800 A 20010305; AU 773419 B2 20040527; BR 0012932 A 20030429; CA 2379973 A1 20010215; CN 1178438 C 20041201; CN 1375146 A 20021016; EP 1198934 A1 20020424; HK 1047836 A1 20030307; HK 1047836 B 20050722; IL 147717 A0 20020814; JP 2003506968 A 20030218; KR 20020037342 A 20020518; MX PA02001199 A 20020730; NO 20020517 D0 20020201; NO 20020517 L 20020201; RU 2002105522 A 20030910; UA 70375 C2 20041015
DOCDB simple family (application)
US 0021441 W 20000803; AU 6523800 A 20000803; BR 0012932 A 20000803; CA 2379973 A 20000803; CN 00811248 A 20000803; EP 00952564 A 20000803; HK 02109400 A 20021230; IL 14771700 A 20000803; JP 2001515594 A 20000803; KR 20027001541 A 20020204; MX PA02001199 A 20000803; NO 20020517 A 20020201; RU 2002105522 A 20000803; UA 200210288 A 20000803