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Apparatus, method, and system for compressing a digital input signal in more than one compression mode

  • US 5,530,750 A
  • Filed: 02/18/1994
  • Issued: 06/25/1996
  • Est. Priority Date: 01/29/1993
  • Status: Expired due to Term
First Claim
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1. Apparatus for compressing a digital input signal in a selected one of plural compression modes to provide a compressed digital signal, the plural compression modes including a first compression mode and a second compression mode, the compressed digital signal having a higher bit rate in the first compression mode than in the second compression mode, the apparatus comprising:

  • deriving means for deriving from the digital input signal spectral coefficients grouped by frequency and time into bands, each band having a frequency width, the deriving means including frequency width setting means for setting the frequency width of at least one of the plural bands according to the selected compression mode;

    a quantizer, the quantizer receiving the bands of spectral coefficients from the deriving means, and providing bands of quantized spectral coefficients; and

    including means for including in the compressed digital signal the quantized spectral coefficients from the quantizer and sub information for each band.

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