Title:
ORTHOGONAL CONVERSION CODING DEVICE
Document Type and Number:
Japanese Patent JPH0275291
Kind Code:
A
Abstract:
PURPOSE:To improve transmission efficiency by multiplying a coefficient less than the unity to a prediction signal using correlation of time base signals so as to apply prediction coding of leakage integration type. CONSTITUTION:A prediction coefficient circuit 10 applies prediction coding of leakage integration type by multiplying a predetermined value less than the unity with an inter-frame prediction signal (g) using correlation of time base signals to output a prediction signal (h). If the calculation accuracy of an orthogonal converter 3 and an orthogonal inverse converter 28 differs, the difference from the arithmetic accuracy in a decoder side, that is, the rate of accumulation of the arithmetic error due to mismatching as the elapse of time is suppressed. As a result, the time reaching a threshold level in which a periodic refresh has to be implemented is extended. Thus, the transmission efficiency is improved.
Inventors:
TANOI HISAYUKI
Application Number:
JP22637588A
Publication Date:
March 14, 1990
Filing Date:
September 12, 1988
Export Citation:
Assignee:
NEC CORP
International Classes:
H04N19/50; H04N19/423; H04N19/503; H04N19/60; H04N19/61; H04N19/65; H04N19/85; (IPC1-7): H04N7/137
Domestic Patent References:
| JPS61131986A | 1986-06-19 |
Attorney, Agent or Firm:
Masaki Yamakawa (2 outside)
Next Patent: METHOD AND APPARATUS FOR ADJUSTING COLOR SIGNAL