Method, apparatus and system for embedding data in and extracting data from encoded voice code

(19)

(11)

EP 1 333 424 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	13.07.2005 Bulletin 2005/28

(43)	Date of publication A2:
	06.08.2003 Bulletin 2003/32

(21)	Application number: 03250682.6

(22)	Date of filing: 03.02.2003

(51)	International Patent Classification (IPC)⁷: G10L 19/00, H04Q 7/22, H04M 3/50

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
	Designated Extension States:
	AL LT LV MK RO

(30)

Priority:

04.02.2002 JP 2002026958
24.01.2003 JP 2003015538

(71)	Applicant: FUJITSU LIMITED
	Kawasaki-shi, Kanagawa 211-8588 (JP)

(72)	Inventors:
	Ota, Yasuji, c/o Fujitsu Limited Kawasaki-shi, Kanagawa 211-8588 (JP) Suzuki, Masanao, c/o Fujitsu Limited Kawasaki-shi, Kanagawa 211-8588 (JP) Tsuchinaga, Y., Fujitsu Kyushu Digital Tech. Ltd. Fukuoka-shi, Fukuoka 812-0011 (JP) Tanaka, Masakiyo, c/o Fujitsu Limited Kawasaki-shi, Kanagawa 211-8588 (JP) Sasaki, Shigeru, c/o Fujitsu Limited Kawasaki-shi, Kanagawa 211-8588 (JP)

(74)	Representative: Williams, Michael Ian et al
	Haseltine Lake Imperial House 15-19 Kingsway London WC2B 6UD London WC2B 6UD (GB)

(54)	Method, apparatus and system for embedding data in and extracting data from encoded voice code

(57) When a voice encoding apparatus embeds any data in encoded voice code, the apparatus determines whether data embedding condition is satisfied using a first element code from among element codes constituting the encoded voice code, and a threshold value. If the data embedding condition is satisfied, the apparatus embeds optional data in the encoded voice code by replacing a second element code with the optional data. When a voice decoding apparatus extracts data that has been embedded in encoded voice code, the apparatus determines whether data embedding condition is satisfied using a first element code from among element codes constituting the encoded voice code, and a threshold value. If the data embedding condition is satisfied, the apparatus determines that optional data has been embedded in the second element code portion of the encoded voice code and extracts this embedded data.

Search report