Patent Number:
7,714,751
Title:
Transcoder controlling generated codes of an output stream to a target bit rate
Abstract:
A transcoder calculates a reference conversion factor on the basis of a ratio between a total target bit rate of a whole second stream and an total input bit rate of a whole first stream and calculates a coefficient of variation from the total target bit rate of the whole second stream and an average output bit rate of a converted second stream in the N period. Next, a quantization step conversion factor in the next (N+1) period is calculated by adding the coefficient of variation to the reference conversion factor. Then, a quantization step value of a second stream in the (N+1) period is calculated by multiplying a quantization step value of a first stream in the (N+1) period by the quantization step conversion factor.
Inventors:
Hasegawa; Hiromu (Osaka, JP), Yanagida; Miyuki (Tokyo, JP)
Assignee:
MegaChips Corporation
International Classification:
H03M 7/00 (20060101)
Expiration Date:
5/11/12018