EP 1020848 A2 20000719 - Method for transmitting auxiliary information in a vocoder stream
Title (en)
Method for transmitting auxiliary information in a vocoder stream
Title (de)
Verfahren zur Übertragung von zusätzlichen informationen in einem Vokoder-Datenstrom
Title (fr)
Procédé pour la transmission d'informations auxiliaires dans un flux généré par un vocodeur
Publication
Application
Priority
US 22810299 A 19990111
Abstract (en)
Non-speech information is sent in the bits allocated to one or both of a vocoder's codebooks' output by selling the gain for the corresponding codebook to zero. By selling the gain to zero, the codebook output will not be interpreted by the receiving vocoder. In this way, it is possible to transmit additional information in a way that is totally transparent to the vocoder. Applications for this technique of sending "secret" messages include, but is not limited to, transmitting parameters for generating non-speech signals. As an example, information to generate call waiting tones, DTMF, or TTY/TDD characters can be clandestinely embedded in the compressed bit stream so that these non-speech tones can be regenerated. <IMAGE>
IPC 1-7
IPC 8 full level
G10L 19/02 (2006.01); G10L 11/02 (2006.01); G10L 19/00 (2006.01); G10L 19/12 (2013.01); G10L 19/14 (2006.01); G10L 25/78 (2013.01); H04W 4/16 (2009.01); H04W 28/00 (2009.01); H04W 88/00 (2009.01); H04W 88/02 (2009.01)
CPC (source: EP KR)
G10L 19/018 (2013.01 - KR); G10L 19/12 (2013.01 - EP); G10L 19/16 (2013.01 - KR); G10L 25/78 (2013.01 - EP)
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)
EP 1020848 A2 20000719; AU 6533799 A 20000713; BR 0000002 A 20020102; CA 2293165 A1 20000711; CN 1262577 A 20000809; JP 2000209663 A 20000728; KR 20000053407 A 20000825
DOCDB simple family (application)
EP 00300042 A 20000106; AU 6533799 A 19991217; BR 0000002 A 20000103; CA 2293165 A 19991230; CN 00101021 A 20000110; JP 2000002766 A 20000111; KR 20000000557 A 20000107