Patent ID: 6792196
Filing Date: 2004-09-14
Classification: H04N

Abstract:
A reproduction method for reading out coded data which is obtained by coding video signals by three coding methods of an intra frame coding (I), a forward prediction coding (P), and a bidirectional prediction coding (B), the coded data constituting a group of pictures (GOP) in a cycle of the intra frame coding, and being coded in a variable bit rate with a data amount of each GOP varying with images, from a coded data generating unit as a coded data stream, and decoding and outputting the coded data stream, said reproduction method comprising:reproducing the coded data stream from the coded data generating unit by a reproduction circuit; temporarily storing the coded data stream from the reproduction circuit in a first memory; reading out the coded data stream from the first memory to decode the coded data stream by a decoder circuit; temporarily storing decoded image data from the decoder circuit in a second memory; outputting the decoded image data from the second memory or the decoder circuit to an output circuit, as a video signal; storing coded data streams of one or more GOP units, or one or more data streams coded by the intra frame coding, which are previous to a coded data stream of a frame presently displayed, in a third memory provided at an output of the reproduction circuit or the first memory; controlling writing and reading of an address into and out of the third memory by a control circuit; and when an image previously displayed is to be displayed again, reading out and decoding a prescribed coded data stream stored in the third memory to redisplay the image previously displayed, without reading out coded data again from the coded data generating unit.