Transcoder
AssigneeMegaChips Corporation
InventorsHiromu HASEGAWA, Makoto Saito
Life of this patent
Estimating the term…
Abstract
In a transcoder, a decoder decodes a stream and an encoder encodes the stream again. The encoder calculates the quantization step value by using an average period bit rate (ASn(M)) of a first stream or an average period bit rate (ACn(M)) of a second stream. Buffers store bit rates (Sn, Cn) of the first and second streams for M periods, respectively. The encoder uses the average period bit rate (ASn(M)) of the first stream or then average period bit rate (ACn(M)) of the second stream in any one of the periods M1, M2 and M3 among M periods.
Claims20
A transcoder for converting a first stream into a second stream, comprising:
- a part for acquiring a bit rate of a first stream per control unit time;
- a buffer for storing bit rates of a first stream in a plurality of past periods;
- a reference value calculation part for acquiring bit rates of a first stream in a selected period from bit rates of a first stream in said plurality of past periods which are stored in said buffer, to calculate a reference value of bit rates of a first stream in said selected period;
- and
- a quantization step value calculation part for calculating a quantization step value of a second stream by including said reference value of bit rates of a first stream in said selected period which is calculated by said reference value calculation part as a parameter.
A transcoder for converting a first stream into a second stream, comprising:
- a part for acquiring a bit rate of a converted second stream per control unit time;
- a buffer for storing bit rates of a second stream in a plurality of past periods;
- a reference value calculation part for acquiring bit rates of a second stream in a selected period from bit rates of a second stream in said plurality of past periods which are stored in said buffer, to calculate a reference value of bit rates of a second stream in said selected period;
- and
- a quantization step value calculation part for calculating a quantization step value of a second stream by including said reference value of bit rates of a second stream in said selected period which is calculated by said reference value calculation part as a parameter.
Dependencies are inferred from the claim text.