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Methods of efficiently recording an audio signal in semiconductor memory

  • US 5,495,552 A
  • Filed: 04/14/1993
  • Issued: 02/27/1996
  • Est. Priority Date: 04/20/1992
  • Status: Expired due to Term
First Claim
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1. A method of recording an audio signal in a semiconductor memory, comprising the steps of:

  • (a) digitizing an audio signal to generate digitized audio data;

    (b) encoding said digitized audio data to generate a plurality of successive hierarchical levels of data corresponding to an audible portion of the audio signal including a lowest hierarchical level of data for reproduction of the audio signal with relatively low fidelity, and including at least one other higher hierarchical level of data, each successive higher hierarchical level representing additional data for successively relatively greater fidelity;

    (c) recording said generated hierarchical levels of data in said semiconductor memory;

    (d) continuing to record generated hierarchical levels of data into said semiconductor memory upon determining that said semiconductor memory has reached maximum storage capacity by overwriting a highest hierarchical level of data previously recorded in said semiconductor memory with generated lower data of hierarchical levels lower than the overwritten highest hierarchical level; and

    (e) recording, in said semiconductor memory, a code indicative of a number of hierarchical levels of data currently recorded therein.

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