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Title:
FREQUENCY CONVERTER AND SERIAL/PARALLEL CONVERSION METHOD USING THE SAME
Document Type and Number:
Japanese Patent JP3169418
Kind Code:
B2
Abstract:

PURPOSE: To provide the frequency converter having a relatively simple hardware configuration and with less deterioration in picture quality.
CONSTITUTION: The conversion from (M-1)-point to (N-1)-point is performed by serially connecting an A/D converter 2, serial/parallel converter 3, M-point DCT circuit 4, conversion coefficient adjustment circuit 5, N-point IDCT circuit 6, phase adjustment circuit 7, parallel/serial converter 8, and D/A converter 9. The serial/parallel converter 3 takes M parallel data as one block and takes the final picture element of the front block and the leading picture element of the rear block as the same picture element to make the phase between picture elements after conversion of a linear phase. As the conversion coefficient inclines toward the low-order components with the discrete cosine conversion by the M-point DCT circuit 4, there is not much deterioration in picture quality even though the high-order component is adjusted by the circuit 5.


Inventors:
Seto, Hitoshi
Nakai, Takahiro
Application Number:
JP4937992A
Publication Date:
May 28, 2001
Filing Date:
March 06, 1992
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H04N7/01; (IPC1-7): H04N7/01
Attorney, Agent or Firm:
早瀬 憲一