Apparatus for combining PCM-coded signals. Amft, O. European Patent EP1320278, 2003.
Apparatus for combining PCM-coded signals [link]Paper  abstract   bibtex   
The device has an asynchronous digital logic circuit (1) with inputs for PCM encoded values (PP(X1),P(X2)) and an output for one PCM encoded value (P(Y)) corresponding to the encoded sum of the input values. The asynchronous digital logic circuit is an arrangement of logic gates that combines the inputs with the output. It is a programmable logic circuit. AN Independent claim is also included for the following: a method of manufacturing and inventive device.
@Misc{Amft2003-Patent,
  Title                    = {Apparatus for combining PCM-coded signals},

  Author                   = {Oliver Amft},
  HowPublished             = {European Patent EP1320278},
  Year                     = {2003},

  Abstract                 = {The device has an asynchronous digital logic circuit (1) with inputs for PCM encoded values (PP(X1),P(X2)) and an output for one PCM encoded value (P(Y)) corresponding to the encoded sum of the input values. The asynchronous digital logic circuit is an arrangement of logic gates that combines the inputs with the output. It is a programmable logic circuit. AN Independent claim is also included for the following: a method of manufacturing and inventive device.},
  Owner                    = {oam},
  Timestamp                = {2007/01/31},
  Url                      = {http://www.freepatentsonline.com/EP1320278.html}
}

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