Abstract
A multiplexor multiplexing an unlimited number of channels without the load on the multiplexor being increased. This multiplexor has a plurality of one channel encoders, for example four stages of encoders connected in series. When the first encoder is inputted with audio/video data of one channel, the data is inputted from the first encoder to the second encoder at the next stage, multiplexed by audio/video data of one channel inputted to the second encoder and then inputted to the third encoder at the next stage. By repeating this multiplexing, the number of multiplexed channels can be increased, and the load on the multiplexor is not increased because each encoder is inputted only with data for one channel. An abnormality detector is provided for each encoder to release an abnormal encoder from the multiplexor when the encoder's abnormality is detected.
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