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