A transmission system wherein PCM code words are converted into DPCM code words at the transmit side and are reconverted into PCM code words at the receive side. A DPCM coder comprising a respective quantizer for variable-length code words, a quantizer for code words having a fixed, below-average length, and a DPCM decoder comprising a code converter for variable-length code words and a code converter for code words having a fixed, below-average length are provided for this purpose. The type of conversion for the next PCM code word present at the input is selected after each conversion on the basis of the number of memory locations that still exist. This transmission system is suitable for data reduction, particularly of digital video signals.
* 4,656,500 Adaptive type compression method for compressing a color image by imparting predetermined variable-length codes to combinations of quantized values based upon quantized prediction error components
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