Global Patent Index - EP 1020848 A2

EP 1020848 A2 2000-07-19 - 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

EP 1020848 A2 (EN)

Application

EP 00300042 A

Priority

US 22810299 A

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 (main, further and additional classification)

G10L 19/00

IPC 8 full level (invention and additional information)

G10L 19/02 (2006.01); G10L 11/02 (2006.01); G10L 19/00 (2006.01); G10L 19/12 (2006.01); G10L 19/14 (2006.01); G10L 25/78 (2013.01); H04Q 7/38 (2006.01)

CPC (invention and additional information)

G10L 19/12 (2013.01); G10L 25/78 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

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

INPADOC legal status


2001-08-29 [RIC1] CLASSIFICATION (CORRECTION)

- Ref Legal Event Code: RIC1

- Free Format Text: 7G 10L 19/00 A, 7G 10L 19/14 B, 7G 10L 11/02 B

2001-08-16 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Date of withdrawal: 20010622

2000-07-19 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-07-19 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Ref Legal Event Code: AX

- Free Format Text: AL;LT;LV;MK;RO;SI