The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 07, 1995
Filed:
Feb. 25, 1993
Eri Murata, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A subtracter (20) supplies a prediction error signal (21), derived from a prediction signal (101) and an input motion video signal (1). A quantizer (30) quantizes the prediction error signal to generate a quantized prediction error signal (31). A reproduced prediction error signal (81) reproduced by an inverse-quantizer (80) is added to the prediction signal by an adder 90, and the sum is supplied to the predictor (100), which generates the prediction error signal. The quantized prediction error signal is converted by a variable word length coder (40) into a variable word length code sequence. A generated information quantity calculating section (50) counts the number of bits in the sequence frame by frame. A quantization characteristic determining circuit (60) supplies, on the basis of the result of counting, a controller (70) with a quantization characteristic candidate signal 61 indicating the candidate of the quantization characteristic to be used in the next frame. The controller 70 compares the coarseness of the quantization characteristic used in the preceding frame with the quantization characteristic candidate signal, determines the quantization characteristic to be used in the current frame, and supplies a quantization characteristic control signal (75) to the quantizer (30) and the inverse-quantizer (80).