Importance

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Abstract

Digital signals, such as PCM-encoded audio signals, are reproduced, delayed, and then mixed with edit digital signals which are supplied from a suitable source. Mixing is carried out by gradually decreasing the value of one while concurrently gradually increasing the value of the other digital signals and combining the decreasing and increasing signals such that one of them gradually is replaced by the other. The resultant mixed digital signals then are recorded by a recording transducer which is spaced from the reproducing transducer by an amount corresponding to the aforementioned delay. In one embodiment, the digital signals are recorded in a single track on a record medium in the form of a sequence of data blocks, each data block being formed of plural data (i.e. PCM) words and an error check work (e.g. obtained by the so-called full adding code) associated with the plural data words. In another embodiment, the digital signals are recorded in separate parallel tracks, each track containing a sequence of data blocks with each data block having plural data words and an error check word. In an alternative embodiment wherein the digital signals are recorded as separate sequences of data blocks in respective parallel tracks, the data blocks in one track which normally are in time-alignment with corresponding data blocks in the other track are displaced therefrom.

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First Claim