the selected transmission medium the compressed primary fields frames includes sufficient data to reproduce interlaced scanned images of a first level of spatial resolution depending on the particular system the first level of spatial resolution may be equivalent to high definition television signals or it may be of some lesser level of resolution e g standard ntsc resolution the compressed primary video signal from the compressor 14 is coupled to a decompressor 22 which reproduces the primary video signal in interlaced scanned format the decompressor 22 is of the type which performs the inverse processes of the compressor 14 and is similar to decompressors to be utilized in interlaced scanned receivers for reproducing the compressed data transmitted by the modem 18 the reproduced primary video signal is coupled to a secondary field predictor 24 predictor 24 generates lines that are interstitial to the lines of the reproduced primary fields the predictor 24 may be in part that portion of a motion compensated interlaced scanned to non interlaced scanned convertor that generates the missing lines of a non interlaced scanned image from an interlaced scanned image of which there are many variations known in the video signal processing art predicted secondary fields from the predictor 24 are applied to one input terminal of a subtracter 26 and corresponding secondary fields from the extractor 20 are applied to a second input terminal of the subtracter 26 the differences or residues generated by the subtracter are coupled to a quantizer 28 wherein they are reduced to a predetermined bit width the foregoing anticipates digital signal processing.