Methods and apparatus for reducing the bandwidth required to transmit analog information. The analog information is converted to digital data organized in time defined blocks of information called frames. The content of a frame may be modeled as a composite of superimposed objects, which are subsets of information in the frame, that are largely unchanged frame to frame. Each object in a present frame may be represented by an identification of the object and a description of the charges in object-to-frame relationship that occurred from a previous frame to the present frame. The objects in the present frame may then be reconstructed by adjusting the objects in the previous frame in accordance with the change in object-to-frame relationships.