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Method and apparatus for digital data compression

  • US 4,503,510 A
  • Filed: 12/05/1983
  • Issued: 03/05/1985
  • Est. Priority Date: 10/31/1980
  • Status: Expired due to Fees
First Claim
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1. Digital compression filter means for producing a stream of compressed digital signals, Δ

  • n, from an input stream of digital sample signals, fn, comprising,delay means having an input to which said input stream is supplied, said delay means including a plurality of sample signal length sections,multiplexer means to which digital sample signal outputs from sections of the delay means are supplied, andan arithmetic and logic unit responsive to digital sample signals from said multiplexer means, said arithmetic and logic unit having an output stream of compressed digital signals in accordance with the following equation
    
    
    space="preserve" listing-type="equation">Δ

    .sub.n =y.sub.n -y.sub.n-1 +2.sup.-m.sbsp.2 y.sub.n-1 wherein;

    
    
    space="preserve" listing-type="equation">y.sub.n =0.5f.sub.n -0.5f.sub.n-1 +2.sup.-m.sbsp.1-1 f.sub.n-1,m1 and m2 are positive integers, andn is an integer comprising the argument, or index, of the function.

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