EP 1564723 A4 20051221 - TRANSCODER AND CODER CONVERSION METHOD
Title (en)
TRANSCODER AND CODER CONVERSION METHOD
Title (de)
TRANSKODER UND KODIERKONVERTIERUNGSVERFAHREN
Title (fr)
TRANSCODEUR ET PROCEDE DE CONVERSION PAR CODEUR
Publication
Application
Priority
- JP 0312859 W 20031008
- JP 2002317204 A 20021031
Abstract (en)
[origin: EP1564723A1] A two-way conversion transcoder comprising a spectrum parameter calculation circuit (100) that calculates a spectrum parameter for a signal x(n) produced by decoding a first code; a coefficient calculation circuit (130) that receives the spectrum parameter and converts it to the coefficients of a band extended signal, a noise generation circuit (120) that outputs a band-limited noise signal, a gain circuit (140) that multiplies the output signal of the noise generation circuit by a gain, a synthesis filter circuit (170) that receives the output signal from the noise generation circuit (120) and the coefficients from the coefficient calculation circuit (130) and outputs a high frequency signal y(n) for band extension, a sampling frequency conversion circuit (180) that outputs a signal s(n) generated by up-sampling the signal x(n) to a predetermined sampling frequency, an adder (190) that adds up a high-frequency signal y(n) and the signal s(n) to form a band extended signal z(n), and a second encoding circuit (195) that encodes the band extended signal z(n) by a second encoding method and outputs the encoded signal. <IMAGE>
IPC 1-7
IPC 8 full level
G10L 19/12 (2013.01); G10L 19/00 (2013.01); G10L 19/07 (2013.01); G10L 21/0388 (2013.01); H03M 7/30 (2006.01)
CPC (source: EP KR)
G10L 19/173 (2013.01 - EP KR); G10L 21/038 (2013.01 - KR)
Citation (search report)
- [DA] JAX P ET AL: "Wideband extension of telephone speech using a hidden Markov model", IEEE WORKSHOP ON SPEECH CODING. PROCEEDINGS. MEETING THE CHALLENGES OF THE NEW MILLENNIUM, 17 September 2000 (2000-09-17), pages 133 - 135, XP002185445
- See references of WO 2004040552A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1564723 A1 20050817; EP 1564723 A4 20051221; EP 1564723 B1 20080618; AU 2003271119 A1 20040525; CA 2504174 A1 20040513; CN 100498933 C 20090610; CN 1708786 A 20051214; DE 60321712 D1 20080731; HK 1077913 A1 20060224; JP 2004151424 A 20040527; JP 4438280 B2 20100324; KR 100715014 B1 20070509; KR 20050061579 A 20050622; WO 2004040552 A1 20040513
DOCDB simple family (application)
EP 03751372 A 20031008; AU 2003271119 A 20031008; CA 2504174 A 20031008; CN 200380102291 A 20031008; DE 60321712 T 20031008; HK 05109774 A 20051103; JP 0312859 W 20031008; JP 2002317204 A 20021031; KR 20057007432 A 20050428