Patent ID: 6058240
Filing Date: 2000-05-02
Classification: H04N

Abstract:
A method for generating an MPEG compatible digital image representative signal which when recorded facilitates reproduction at more than one speed, said method comprising the steps of:a) identifying a subset of intra-coded macroblocks in a data stream comprising an MPEG compatible digital image representative signal;b) decoding said subset of intra-coded macroblocks to extract intra-coded data;c) storing a first set of specific coefficients selected from said extracted intra-coded data to form a first stream of reduced bit rate intra-coded frames;d) generating a first number of said first set of reduced bit rate intra-coded frames to define a first trick play speed;e) multiplexing said first stream of reduced bit rate intra-coded frames with said data stream at a rate related to said first trick play speed to produce a new bit stream for recording a full resolution version of said digital image representative signal together with a first trick play speed reduced resolution version of said digital image representative signal; and,f) recording said new bit stream.