Abstract: The effects of the channel bit error on the reconstructed images of the Differential Pulse Code Modulation (DPCM) systems are analysed in this paper. Based on this analysis, an error detection algorithm, which is suitable for the One—dimensionaL DPCM systems, is proposed with mathematical analysis and experiments. It is shown from the results that the origin of the erroreous pixel within a scan line can be detected accurately by the algorithm under some certain conditions without adding any auxiliaries to the DPCM encoders. Furthermore, the algorithm may be fast implemented in digital computers due to its simplicity and recursive property. The experiments also demonstrate that comfining this algorithm with the correction method of line replacement is effective in improving the quality of the DPCM reconstructed image which contains the channel bit error effects.