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Multipoint communication apparatus with reduced number of audio decoders

  • US 5,727,075 A
  • Filed: 03/05/1996
  • Issued: 03/10/1998
  • Est. Priority Date: 04/17/1995
  • Status: Expired due to Term
First Claim
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1. A multipoint communication apparatus for receiving and decoding audio codewords transmitted from a plurality of other multipoint communication apparatuses via a corresponding plurality of channels, said audio codewords containing respective gain indices and shape indices, to create an audio output signal, comprising:

  • a gain detector for receiving said audio codewords, monitoring the gain indices contained therein, and dynamically selecting a set of M channels among said plurality of channels, responsive to said gain indices, where M is a fixed positive integer;

    a channel selector coupled to said gain detector, for selecting the audio codewords received on the M channels selected by said gain detector;

    a set of M decoders coupled to said channel selector, for decoding the audio codewords selected by said channel selector to produce respective outputs; and

    an adder coupled to said decoders, for adding the outputs of said M decoders to create said audio output signal.

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