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Digital audio transmission

  • US 4,703,480 A
  • Filed: 11/16/1984
  • Issued: 10/27/1987
  • Est. Priority Date: 11/18/1983
  • Status: Expired due to Term
First Claim
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1. A method of sub-band coding for transmitting signals from a transmitter to a receiver comprising the steps of (a) dividing an input signal into two or more sub-bands, (b) representing each sub-band by a sequence of digital words each having a plurality of bits, (c) selecting all but at least one of the least significant of each of said digital words from each sub-band to be always transmitted bits, (d) adaptively allocating the number of bits to each sub-band solely as a function of said always transmitted bits, and (e) transmitting said always transmitted bits plus any additionally allocated bit or bits, whereby the coded signal may be decoded at a receiver by reference only to said always transmitted bits.

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