EP 1564723 A1 20050817 - 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)
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)
Designated contracting state (EPC)
DE FR GB
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