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Title:
DIGITAL ENCODER AND DECODER
Document Type and Number:
Japanese Patent JP3160343
Kind Code:
B2
Abstract:

PURPOSE: To reduce picture quality deterioration which is caused by cross color interference with simple constitution,
CONSTITUTION: A composite signal is decoded by an NTSC decoder 2 so as to obtain a color signal, an NTSC encoder 3 modulates a color sub-carrier by the color signal and the amplitude of the modulated sub-carrier is adjusted by a variable attenuator 4. Difference between the sub-carrier whose amplitude is modulated and the composite signal whose phase is adjusted by a delay circuit 1 is obtained by a subtracting circuit 5 so as to adopt it as a luminance signal and the luminance signal is encoded by an application-type DCT encoding circuit with movement compensation 6. On the other hand, a color difference signal from the NTSC decoder 2 is synthesized by a synthesizing circuit 9 and synthesized color data is encoded by the application-type DCT encoding circuit with movement compensation 7.


Inventors:
Kenzo Seo
Hiroshi Okamura
Application Number:
JP381992A
Publication Date:
April 25, 2001
Filing Date:
January 13, 1992
Export Citation:
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Assignee:
Japan Broadcasting Corporation
International Classes:
H04N11/04; (IPC1-7): H04N11/04
Domestic Patent References:
JP53120331A
JP341894A
Attorney, Agent or Firm:
Yoshikazu Tani (1 person outside)