×

Device for arithmetic decoding/encoding, and device using the same

  • US 20050088324A1
  • Filed: 10/20/2004
  • Published: 04/28/2005
  • Est. Priority Date: 10/22/2003
  • Status: Abandoned Application
First Claim
Patent Images

1. An arithmetic decoding device comprising:

  • an arithmetic decoding unit operable to decode an encoded moving picture inputted, thereby outputting a decoded symbol as a result of decoding;

    a context calculating unit operable to calculate a context number for the encoded moving picture, thereby feeding the calculated context number to said arithmetic decoding unit;

    a symbol appearing probability control unit operable to renew a set of a symbol value and a symbol appearing probability for one of a most probable symbol and a least probable symbol, based on the decoded symbol outputted by said arithmetic decoding unit; and

    a probability state storing unit operable to store the set of the symbol value and the symbol appearing probability, the set being renewed by said symbol appearing probability control unit and indexed with the context number, wherein, while said arithmetic decoding unit decodes an n-th code of the encoded moving picture, said context calculating unit is operable in parallel to calculate the context number of an (n+1)-th code of the encoded moving picture, the (n+1)-th code being next to the n-th code, where n is a natural number.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×