Title:
DIGITAL SIGNAL CODER DECODER, DIGITAL SIGNAL CODER AND DIGITAL SIGNAL DECORDER
Document Type and Number:
Japanese Patent JP3508146
Kind Code:
B2
Abstract:
PURPOSE: To perform an orthogonal transform and an inverse orthogonal transform with a small amount of hardware and computations.
CONSTITUTION: The coder decoder decodes coded signals by the following processes. The output which is filter divided is frequency analyzed by MDCT circuits 623 to 625, the analyzed output is quantized to obtain coded signals and recorded or transmitted. During a reproducing or a receiving, the signals are converted from a frequency base to a time base by an IMDCT-M circuit 624 and an IMDCT-L circuit 625 and synthesized by synthesis filters 202 and 201. At each filter band, noise levels caused by omitting fractions in the MDCT and IMDCT computations are made different.
Inventors:
Shimoyoshi, Osamu
Akagiri, Kenzo
Abe, Miki
Watanabe, Takahiro
Akagiri, Kenzo
Abe, Miki
Watanabe, Takahiro
Application Number:
JP24357592A
Publication Date:
March 22, 2004
Filing Date:
September 11, 1992
Export Citation:
Assignee:
SONY CORP
International Classes:
G10L19/02; H03M7/30; H04B14/04; H04N19/115; H04N19/119; H04N19/124; H04N19/132; H04N19/134; H04N19/136; H04N19/146; H04N19/169; H04N19/189; H04N19/196; H04N19/42; H04N19/423; H04N19/46; H04N19/60; H04N19/625; H04N19/635; H04N19/70; H04N19/80; H04N19/85; (IPC1-7): G10L19/02; H03M7/30
Attorney, Agent or Firm:
小池 晃 （外２名）