Method and apparatus for efficient statistical multiplexing of voice and data signals
First Claim
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1. A statistical multiplexer including a plurality of input ports wherein each of said input ports has a split band encoder and each of said split band encoders is provided with a plurality of encoder elements, means for allocating to each encoder element of each of said split band encoders a bit allocation determined by comparing a signal in said element with signals in all of the elements of all split band encoders coupled to said input ports.
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Abstract
The improved multiplexer described herein uses split band encoding across a plurality of input ports to increase the statistical advantage for compression gains but does not require a large number of input ports to achieve its advantage.
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13 Claims
- 1. A statistical multiplexer including a plurality of input ports wherein each of said input ports has a split band encoder and each of said split band encoders is provided with a plurality of encoder elements, means for allocating to each encoder element of each of said split band encoders a bit allocation determined by comparing a signal in said element with signals in all of the elements of all split band encoders coupled to said input ports.
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7. A statistical multiplexer capable of operating with a relatively small number of input ports and exhibiting a relatively small freeze out factor for the number of input ports, comprising:
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a split band encoder for each of said ports, each of said port encoders including a plurality of encoder elements for encoding each port'"'"'s input in a bit length determined by a common control means, common control means responsive to signals in each said encoder element for allocating thereto a bit count capacity related to the relative signals in all said encoder elements of all said ports, and multiplexing means for concatenating outputs of all said encoding elements. - View Dependent Claims (8, 9)
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10. A multiport split band encoding digital multiplexer with n ports, comprising:
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a plurality of n encoders, each associated with one of said ports, each said encoder comprising; a plurality of m filters, whre m is an integer greater than 1, each of said m filters with an input connected to the associated port, and an output, a plurality of m quantizers, each connected to a different one of said filter outputs, for quantizing said filter output in a variable bit word, and a common control including; bit allocation means separately responsive to each said filter output for assessing the relative power level of each filter output versus the total power of all said filter outputs, and on the basis of said assessment for allocating none or some of a pool of bit capacity to each of said quantizers, and multiplexing means for concatenating in time the quantized outputs of all said quantizers. - View Dependent Claims (11, 12, 13)
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Specification