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

  • US 5,142,656 A
  • Filed: 11/04/1991
  • Issued: 08/25/1992
  • 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 generating subband information blocks, each subband information block comprising a set of digital words generated in response to a signal sample block, said means comprising means for applying a discrete transform function to each of said signal sample blocks, andmeans for quantizing with a fixed number of bits one or more digital words corresponding to at least the lowest frequency spectral component of said analog audio signals, but not quantizing all digital words with a fixed number of bits.

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