Importance

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Abstract

A coding apparatus codes signals of a plurality of sorts, multiplexes the coded signals, and records the coded and multiplexed signals on a disklike recording medium. A reproducing apparatus reproduces the recorded signals from the disklike recording medium. The signals to be recorded are separated hierarchically into priority signals to be reproduced preferentially and non-priority signals other than the priority signals, and the separated signals are coded respectively. Whenever the code quantity of the coded signals reaches a predetermined code quantity determined for each track on the recording medium, the coded priority signals and the coded non-priority signals are switched and then outputted. These outputted signals are recorded on a disklike recording medium having roughly a constant recording density in the track direction. Further, the sorts of the signals are switched at predetermined rotational angles of the disklike recording medium. Further, the priority signals and the non-priority signals are switched for each predetermined code quantity of signals reproduced from the disklike recording medium, and then decoded for reproduction. Or else, only the priority signals can be decoded for reproduction.

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First Claim