Abstract: A coding/decoding apparatus for high-speed and reliable detection of even an error which has occurred in the compressing division or between the compressing division and the error correcting division in the coding unit. The coding/decoding apparatus is equipped with, in addition to error correcting means and decompressing means, means for detecting production of data other than statistical coded data, in inputted data, means for detecting an error related to end-of-block data, means for detecting an error related to cyclic signals inserted in the inputted data, and means for detecting an error related to the total number of blocks in each frame.

Abstract: A digital audio synchronizing system resynchronizes the audio signal of a video signal by storing the audio signal in a memory and reading it out from the memory after a time period which is related to the time by which the video signal is delayed as a result of being synchronized to a reference video signal. In order to prevent a discontinuity in the audio signal waveform caused by variations in the time difference between the video signal and the reference signal, the digital audio signal is read out from memory addresses which correspond to the previous difference time and also to a new updated difference time value. The two outputs which are generated by reading the signal from two different areas of the memory are cross-faded with one another over a predetermined time period. The cross-fade operation can be repeated over several cycles, each taking a predetermined unit of time until the audio signal is synchronized to its video counterpart.

Abstract: A digital audio synchronizing system resynchronizes the audio signal of a video signal by storing the audio signal in a memory and reading it out from the memory after a time period which is related to the time by which the video signal is delayed as a result of being synchronized to a reference video signal. In order to prevent a discontinuity in the audio signal waveform caused by variations in the video delay between the video signal and the reference signal, the digital audio signal is read out as a first and a second output from memory addresses which correspond to the previous video delay and to a new updated video delay value. A synchronized audio signal is obtained by switching from the first output to the second output when the muting times of the first and the second outputs are coincident with each other.