Multipoint communication apparatus with reduced number of audio decoders
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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Abstract
A multipoint communication apparatus receives a set of audio signals encoded by gain-shape vector quantization. A gain detector in the multipoint communication apparatus dynamically selects a subset of these audio signals on the basis of gain indices contained in the audio signals. Only the selected subset of audio signals are decoded. The decoded signals are combined to produce an audio output signal.
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Citations
10 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification