Low bit rate transform coder, decoder, and encoder/decoder for high-quality audio

  • US 5,109,417 A
  • Filed: 12/29/1989
  • Issued: 04/28/1992
  • Est. Priority Date: 01/27/1989
  • Status: Expired due to Term
First Claim
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1. An encoder for the encoding of digital information, said digital information comprising signal sample blocks representing analog audio signals, comprisingmeans for defining subbands and for generating subband information blocks, each subband information block comprising a set of digital words generated in response to a signal sample block, andmeans for representing one or more of said digital words in block-floating-point form comprising a mantissa associated with an exponent, for normalizing at least some mantissas, and for dropping a sign bit for a single normalized mantissa uniquely associated with an exponent whenever the value of said sign bit can be established from the value of a most significant data bit in said normalized mantissa.

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